There is a version of the Fender Princeton Reverb story that ends cleanly: a small, chimey, blackface combo, twelve watts of glassy Fender sparkle, beloved by jazz cats, recording engineers, and anyone whose band is, as the old saying goes, too loud for a Princeton. That story is true, and it is told by the ’65 Princeton Reverb Reissue, which sits right there in the Fender catalogue next to this amp, nodding approvingly at its own faithfulness to the 1964 original.
The Fender ’68 Custom Princeton Reverb tells a different story. Same twelve watts. Same 6V6 output pair. Same silver-and-turquoise face. But Fender’s amplifier team quietly rewired the guts — a Bassman tone circuit in place of the classic Blackface stack, a dramatic reduction in negative feedback, and a Celestion Ten 30 speaker where a Jensen used to live — and the result is a Princeton that breaks up earlier, handles drive pedals without gagging, and pushes mid-range frequencies into the room with a confidence the vintage circuit never attempted. This is the Princeton for players who love the format but need to stack an overdrive in front of it. Introduced in late 2013, it earned a Premier Guitar Gear Award in its debut year and has been a mainstay of small-venue and studio rigs ever since.
The price has climbed from its $849.99 launch point to $1,469.99 at Fender.com and Sweetwater as of July 2026 — a 73% increase over twelve years — which means the decision to choose it over a vintage silverface or a boutique clone now requires more justification than it once did. This article provides that justification, or removes it, depending on what you actually need.
From Fullerton to Silverface: The Princeton Reverb Lineage
The Princeton Reverb arrived in 1964 as part of Leo Fender’s Blackface era — that narrow window, roughly 1963 to early 1965, when Fender’s circuits were reaching their design peak even as the company was sliding toward its CBS sale. The original Princeton Reverb used the AA1164 circuit: a single channel with a cathodyne phase inverter, two 6V6 power tubes, a 5AR4 tube rectifier, and a tone circuit derived from the mid-’60s Fender topology with its characteristic midrange scoop. It was the smallest Fender with reverb and tremolo, and at fifteen watts maximum it was practically a studio toy — but a studio toy that happened to define the sound of a thousand late-night sessions, from jazz guitar to country picking to the kind of clean blues lead that rides the knife-edge between sparkle and distortion.
CBS completed its acquisition of Fender in January 1965. The circuits survived nearly intact through the early ownership years, but the cosmetics did not. In late 1967 and into 1968, Fender swept the entire range with new silver control panels and aluminium trim around the speaker baffle. The trim — an angled metal extrusion that looked exactly like the roof flashing used to keep rainwater off a wall — gave this specific era of amp its collector name: the drip-edge. By 1969 the aluminium trim was gone, leaving just the silver panel in its place.
Audiophiles and guitar technicians spent the next four decades having elaborate arguments about whether blackface Princetons sound different from early silverface Princetons. The honest answer is: barely. The Princeton and Deluxe Reverb were among the few Fender models that came through the CBS transition almost unscathed at the circuit level. A real 1967 or 1968 Princeton Reverb with aluminium baffle trim is, for most practical purposes, a blackface Princeton with a different face. It is not the Princeton Reverb that got hurt when CBS started cutting corners — the bigger models, the Twins and Pro Reverbs, took the worst of it.
What players eventually decided, though, is that even the original blackface circuit had some things they wanted to change. The midrange scoop that creates the classic Fender clean also creates a frequency hole that pedals struggle to fill. The negative feedback loop that keeps the circuit stable also slows down the attack and narrows the dynamic window. The Jensen speakers that sound so chimey at living-room volume turn harsh and floppy when hit with serious drive. Amp technicians spent forty years doing a set of well-understood modifications to address these issues. In 2013, Fender’s amplifier product development manager Rick Heins built those mods into the circuit from the factory.
The ’68 Custom Series: Factory-Built Modifications
The ’68 Custom range launched at the 2013 NAMM period and ultimately expanded to include the Custom Deluxe Reverb, the Custom Pro Reverb, the Custom Vibrolux Reverb, the Custom Twin Reverb, and this Princeton Reverb. The shared design premise, as Heins explained in Fender’s own editorial documentation, was to take the modifications that amp-savvy players had been performing on vintage Fender silverfaces for decades and build them in as standard. The “Custom” in the name is not about cosmetic customisation — it means a modified circuit.
For the multi-channel Fender amps in the series (the Deluxe, the Twin), this created a two-channel architecture where the Normal channel retained the Blackface tone circuit and the Custom channel received the modified Bassman stack. The Princeton Reverb has only one channel, which means there is no dual-channel arrangement: it solely features the Bassman tone circuit on its one and only channel. This is an important distinction. Playing the Princeton, you are always in the modified voice. There is no “Normal” mode.
The three circuit modifications work together to produce a fundamentally different amp character:
1. Bassman tone circuit. The classic Blackface tone stack has a pronounced mid-scoop — a dip centred around 700 Hz to 1 kHz that gives Fender clean its scooped, airy quality. The Bassman tone circuit, derived from the tweed-era Fender Bassman, has more low-midrange presence and a less radical scoop. In practice, this means the Princeton sounds bigger and warmer at the same volume settings, notes have more body and weight, and the guitar’s natural midrange frequencies — where chords live in a band mix — are pushed forward rather than recessed. The trade-off is that the classic Fender chimey sparkle is slightly reduced; this is not the amp for players whose entire identity is built on glass-clean highs.
2. Significantly reduced negative feedback. Negative feedback is the electronic mechanism that feeds a fraction of the amp’s output signal back to the input out of phase, which reduces noise and distortion and stabilises the circuit. In most Fender tube amps, the circuit is inherently stable enough that you can reduce negative feedback substantially — all the way to zero if you want — without creating problems. Reducing it produces more gain from the existing stages, a more gradual and musical transition into distortion, faster attack response, and a wider dynamic window: the difference between a clean thumb stroke and a hard pick dig is maximised. The trade-off is slightly more noise and earlier reverb saturation (the reverb knob reaches its useful maximum around 5 rather than 7).
3. Celestion Ten 30 speaker. The Jensen speakers typically associated with Fender Princetons — the P10Q in the vintage originals, the C10R ceramic in the ’65 Reissue — excel at a particular kind of chime at low and moderate volumes. They are less happy when hit with loud, distorted signals, where they tend toward harshness in the upper frequencies and loose, undefined low end. The Celestion Ten 30 (ten-inch, 30W rated) is a fundamentally different driver with better mid-range presence, more robust bass handling, and a speaker breakup character that suits an amp already tuned for earlier power-amp distortion. Sound On Sound’s Dave Lockwood, reviewing the amp in November 2014, noted that the circuit tweaks and speaker voicing made the ’68 Custom “slightly darker than a stock Princeton” — which is why a large-diaphragm condenser placed at six inches gives you a recorded signal closer to what you hear across the room.
Specifications
The Circuit Architecture: What the Princeton Reverb Actually Is
Understanding the ’68 Custom Princeton Reverb well enough to buy it intelligently requires understanding three circuit elements that distinguish every Princeton Reverb from its Fender siblings, regardless of which version you’re looking at.
Cathodyne phase inverter. The Princeton Reverb uses a cathodyne (concertina) phase inverter — a single triode stage with equal plate and cathode resistors — rather than the long-tailed pair (LTP) phase inverter found in the Deluxe Reverb, Twin Reverb, and most higher-power Fender combos. The LTP has roughly twice the output swing before clipping, clips symmetrically producing odd-order harmonics, and provides more output voltage. The cathodyne clips asymmetrically — producing even-order harmonics — which is why a cranked Princeton Reverb sounds warm and harmonically rich in a way that a cranked Deluxe Reverb does not. This is not a character you can recreate by turning the Deluxe Reverb up and cranking the treble down. They are fundamentally different-sounding amplifiers at the point of distortion.
Bias-modulated tremolo. The Princeton Reverb’s tremolo — and the ’68 Custom’s, explicitly — is bias-modulated: it works by oscillating the bias voltage of the output tubes, causing them to conduct more and less current cyclically. This achieves amplitude modulation but the results are subtler and more organic than the photoresistor optocoupler tremolo found in the Deluxe Reverb and Super Reverb. The speed control on the Princeton tends to feel more linear, and the depth of the effect at a given Intensity setting is more musically usable across a wider range. Premier Guitar’s Teja Gerken, in his January 2014 review, called the vibrato “gorgeous, deep, and as authentic-sounding as the reverb.”
The 5AR4 tube rectifier and what it means. The Princeton Reverb uses a 5AR4 rectifier, which provides voltage sag under heavy load — the momentary voltage drop when you hit a loud note that produces that characteristic “bloom” and compression in a tube amp. This is the same mechanism that makes tweed amps feel elastic and touch-sensitive. The ’68 Custom retains this rectifier exactly as the vintage circuit does. Sound On Sound noted that the reduced headroom combined with the tube rectifier sag creates “a wide sweet spot in which you can ride your volume control to go from characterful clean to sustaining lead” — which is the actual use case this amp excels at.
One technical detail about the ’68 Custom that the Guitar Lobby’s gear profile gets wrong: they describe Gary Clark Jr.’s Princeton as having a 5U4GB rectifier and Jensen speaker. Neither specification matches the ’68 Custom Princeton Reverb, which uses a 5AR4 and Celestion Ten 30. The 5U4GB was the original 1964 Princeton Reverb’s rectifier (later changed to 5AR4); the specification description likely conflates a vintage unit with the modern model.
Famous Players: The Honest Assessment
The spreadsheet that drives this article series lists five players for the Fender ’68 Custom Princeton Reverb: Stevie Ray Vaughan, John Mayer, Eric Johnson, Mike Campbell, and Paul Gilbert. These same five names appear on the ’65 Princeton Reverb Reissue and the ’64 Custom Princeton Reverb entries in the same spreadsheet. The explanations for all five are unchanged.
Stevie Ray Vaughan died on August 27, 1990. The Fender ’68 Custom Princeton Reverb launched in late 2013. The gap is twenty-three years. SRV cannot have used this amp. He did use vintage Princeton Reverbs — he is among the documented players of vintage blackface and silverface models — but “SRV used a Princeton Reverb” and “SRV used the ’68 Custom Princeton Reverb” are two sentences with opposite truth values. The conflation is so common in gear marketing that it no longer surprises, but it remains false.
John Mayer is not in the guitarist link database for this series, and no primary source places him specifically on the ’68 Custom Princeton Reverb. He is documented on the Fender ’65 Princeton Reverb Reissue (photographed at Dead and Company shows via Getty Images in 2017). He is also documented on the Vibro-King, Dumble SSS, and Two-Rock platforms. Moving that Reissue documentation sideways to the ’68 Custom is not verification; it is decoration.
Eric Johnson is documented on vintage Twin Reverbs (cut to combo heads) and a Marshall Super Bass, with Sweetwater confirming the Twin Reverbs as his primary clean platform. There is no Princeton Reverb connection — vintage or reissue — in any verified primary source for Johnson.
Mike Campbell of Tom Petty and the Heartbreakers uses a 1963 Fender Princeton Brownface — not a Princeton Reverb, not a ’68 Custom, not anything in this lineage. The Brownface Princeton has no reverb, no tremolo, and predates the Princeton Reverb by a year. Per his Premier Guitar Rig Rundown (2013), his live setup in the Heartbreakers years was the Brownface Princeton, a 1954 tweed Deluxe, an Excelsior, and a Vibrotane. None of these are Princeton Reverbs.
Paul Gilbert is an all-Marshall guitarist at the amp level, documented across multiple Rank 402 research sessions. In mid-2026, Guitar World reported he had switched to Fender Tone Master modeling amplifiers — but the Tone Master is a digital platform, not the ’68 Custom hand-built valve circuit.
Who Actually Uses the ’68 Custom Princeton Reverb
Gary Clark Jr. is the most credible documented user of the ’68 Custom Princeton Reverb. The Premier Guitar Rig Rundown for Clark Jr. and his guitarist Eric Zapata (2019) shows the amp in his setup for smaller venues and Austin blues club appearances, with his tech identifying it as the ’68 Custom Princeton. Clark’s main live platform is his Fender Vibro-King (including a custom unit formerly belonging to Pete Townshend), but when the room does not justify sixty watts, the ’68 Custom Princeton goes in. The evidence is from a tech rather than Clark’s own words in a published interview, which is one step below the gold standard — but a PG Rig Rundown tech identification is a solid primary-source anchor.
Jim Campilongo is not in the guitarist database for this series, but two independent professional reviews of this specific amp single him out unprompted as the reference player for Princeton Reverb tone. Premier Guitar’s Teja Gerken (January 2014): “Just for fun, I tried a Jim Campilongo-inspired move and turned the Princeton’s volume, bass, and treble knobs up all the way, controlling the volume only with the guitar.” Sound On Sound’s Dave Lockwood (November 2014): “There is a lot of bass anywhere above four on the dial — probably too much for anyone but Jim Campilongo.” That two independent reviewers name the same player in the context of this amp, without a PR prompt, is the strongest possible documentary evidence that the association is real. Campilongo is the contemporary guitarist most identified with extreme Princeton usage: everything maxed, guitar volume as the sole dynamic control.
Equipboard lists thirty verified users of the ’68 Custom Princeton Reverb, including Mac DeMarco, Ryan Adams, Daniel Kessler (Interpol), Rachel Goswell (Slowdive), Sam Fender, Phil Elvrum (Mount Eerie), and Gina Gleason (Baroness). None of these are in the guitarist link database for this series. Gary Clark Jr. remains the only DB-linked artist with documented use of this specific amp, framed honestly as Rig Rundown tech identification rather than the player’s own published words.
For historical Princeton Reverb context: Duane Allman used a vintage Princeton Reverb for the slide overdubs on Layla (1970), documented by Guitar Player magazine. Larry Carlton used vintage Princeton Reverbs through the Steely Dan and Joni Mitchell session years. Bill Frisell is a documented Princeton Reverb player across multiple career phases. Ed O’Brien of Radiohead has documented Princeton Reverb use. All of these players are associated with the vintage platform and the ’65 Reissue circuit, not specifically the ’68 Custom’s modified voice — the distinction matters because the tonal character is genuinely different.
What the ’68 Custom Princeton Reverb Actually Sounds Like
The clearest description of what the circuit modifications actually produce comes from Sound On Sound’s Dave Lockwood (November 2014): “There is more mid-range, but not so much that you lose the essential Fender character.” That summary is accurate and useful. This amp still sounds like a Fender Princeton Reverb — the reverb is still lush, the tremolo is still gorgeous, the top end still has Fender shimmer. But the midrange valley is partially filled in, the attack is faster, and the onset of distortion arrives earlier and feels more intentional.
Premier Guitar’s Teja Gerken noted that with an ES-335 at volume 4 or 5, the amp was “loud and clean enough for most jazz gigs.” Above that, “the Princeton gets surprisingly loud and begins to break up in a most musical way.” He found that with a TS-9-style pedal, the amp provided “excellent overdriven sounds” — which is precisely what the circuit was designed to do. The Bassman tone circuit’s extra midrange means an overdrive pedal’s mid-hump frequencies don’t vanish into the scoop; they push through.
The Celestion Ten 30’s contribution is real. Compared to the Jensen C10R ceramic in the ’65 Reissue or the alnico P10R in the ’64 Custom, the Ten 30 has a tighter, punchier low end and a more prominent mid-range peak. At high volumes, where Jensen ceramics can become harsh and thin, the Ten 30 stays controlled. Players who record by close-miking report that the ’68 Custom gives them a usable recorded tone without the usual EQ surgery a Fender Princeton requires in the 3–5kHz range. That said, Lockwood’s SOS review noted one genuine limitation: “Close to complete reverb saturation occurs with the reverb knob at about 5 or 6, which Fender chalks up to the reduction in negative feedback.” The SOS panel found this acceptable; others may not.
The frequency positioning in a band context sits roughly 200Hz–5kHz, with the Bassman tone circuit’s influence pushing the usable low-midrange floor down relative to the ’65 Reissue. The amp occupies the guitar’s natural frequency range without extending into territory where it fights with bass guitar. Its low headroom — clean breaks up at 4 or 5 on the volume control — is a feature, not a bug, if what you want is a small amp with a wide dynamic range under player control.
Tone Recipes and Settings
1. Gary Clark Jr. Small-Room Blues (Blues, Pedal Platform)
Volume 5–6, Treble 6, Bass 4, Reverb 3, Speed 3, Intensity 4. Guitar volume as the master control — roll back to clean up, dig in to distort. Add a Electro-Harmonix Big Muff or Fuzz Face for the heavier passages. Clark’s approach lets the amp’s reduced negative feedback do the work: playing dynamics control the tone colour without touching the amp.
2. Jim Campilongo Maximum Princeton (Country-Jazz Fusion)
Volume 10, Bass 10, Treble 10, Reverb 4. Guitar volume pot from 2 (clean chime) through 7 (warm crunch) to 10 (full bloom). No pedals. This is the recipe both the PG and SOS reviewers reference. Warning: it gets loud, and the bass control at ten is genuinely too much below guitar volume 6 — roll back as needed or position the amp on an angled batten to project rather than thump.
3. Recording Engineer’s Slate (Studio, Clean Platform)
Volume 3, Treble 5, Bass 4, Reverb 5, Speed off, Intensity off. Close-mic with a Shure SM57 at the speaker cone edge, mixed 30:70 with a room condenser at three feet. At this volume the Ten 30 is below its break-in threshold and the cathodyne PI’s warmth becomes the defining characteristic. The result is denser in the mids than a Jensen-equipped Princeton at the same position — useful for solo guitar recording without EQ correction.
4. Edge-of-Breakup Rhythm (Rock, Indie)
Volume 6, Treble 6, Bass 3, Reverb 2, Speed 4, Intensity 3. Single-coils recommended. The amp is right at the threshold between clean and crunch — picking hard distorts, picking softly cleans up. For indie-rock players like Daniel Kessler or Sam Fender who need a Princeton that can keep up with a drum kit when mic’d through the PA, this is the operating position.
5. Surf and Shimmer (Reverb-Soaked Clean)
Volume 3, Treble 7, Bass 3, Reverb 5 (maximum before saturation), Speed 6, Intensity 5. Note: reverb maxes out around 5–6 before reverb trail bleeds into itself — this is intentional, not a flaw, given the reduced negative feedback. The bias tremolo at Speed 6 / Intensity 5 produces the organic, slightly unpredictable warble that the original Princeton Reverb was famous for in early-’60s surf recordings.
6. Dual-Princeton Stereo Slave (Larger Venues)
This is the Gary Clark Jr. approach for rooms bigger than an Austin blues club: the ’68 Custom Princeton runs at Volume 4 as a slave fed from the Vibro-King’s effects loop or a signal splitter. The Princeton adds air, reverb texture, and the Celestion’s mid presence while the Vibro-King handles the heavy lifting. Both amps always on, Princeton contributing to the room sound rather than being the primary source.
7. Pedal Platform for Modern Blues (Overdrive Stack)
Volume 5, Treble 5, Bass 3, Reverb 3, Speed off, Intensity off. Boss BD-2 Blues Driver → Ibanez TS9 Tube Screamer, both engaged simultaneously, TS9 set low-gain with bass rolled off and level boosted. The Bassman tone circuit’s mid-range presence means the TS9’s characteristic 500Hz–1kHz hump doesn’t get swallowed; it pushes through and adds apparent gain without muddying the low end. This is the setting where the ’68 Custom Princeton most obviously departs from the ’65 Reissue — the older circuit feels opaque and compressed with this stack, the ’68 Custom feels open and defined.
Comparisons: Where the ’68 Custom Princeton Sits
vs. Fender ’65 Princeton Reverb Reissue (Rank 402)
The ’65 Reissue is USA-made, PCB-based, and more expensive (approximately $1,579 new in 2026). Its Jensen C10R ceramic speaker, Blackface tone circuit, and standard negative feedback produce a chinier, cleaner, more traditional Fender sound. It has more clean headroom before breakup and a more prominent treble presence. The ’68 Custom is Mexico-made, less expensive at $1,469.99, and fundamentally darker and more mid-forward. The ’65 is the Princeton for players who want the classic Fender clean; the ’68 is the Princeton for players who want to run pedals through it and have the amp meet them halfway. They are genuinely different amps, not just cosmetically different models.
vs. Fender ’64 Custom Princeton Reverb (Rank 407)
The ’64 Custom is Fender’s hand-wired, point-to-point Princeton Reverb at $3,149.99 — roughly twice the price of the ’68 Custom. It uses a Jensen P10R alnico speaker, Vintage Blue tone capacitors, a solid pine cabinet, and AA1164/AA764 circuitry that is closer to the vintage Blackface specification. The ’64 Custom is aimed at players who want maximum vintage faithfulness and are willing to pay a significant premium for hand-wired construction. The ’68 Custom is aimed at players who want a working gigging amp that takes pedals well and costs less than a boutique alternative. PCB vs point-to-point matters for repairability and DIY modification; for pure tone at stage volume, most players cannot reliably distinguish them in a blind test.
vs. Fender ’68 Custom Deluxe Reverb (Rank 404)
Same series, same circuit philosophy, but the Deluxe Reverb delivers 22W through a 12″ Jensen C12K speaker in a significantly larger, heavier cabinet (43 lbs vs 34 lbs). The Deluxe has two channels — one with the Blackface tone circuit and one with the Bassman stack — giving players the ability to switch between voices. The Princeton has only one channel with the Bassman circuit always on. If you need more clean headroom or want channel variety, the Deluxe is the answer; if portability and the Princeton’s cathodyne PI character matter, the Princeton is the answer. The Princeton is also noticeably quieter before breakup — useful for small stages and recording, less useful for gigs with a loud drummer without PA support.
vs. Fender ’65 Deluxe Reverb Reissue (Rank 403)
The ’65 Deluxe is USA-made, 22 watts, 12″ speaker, Blackface circuit with LTP phase inverter — a fundamentally different amp character. It has more clean headroom, a more balanced frequency response, and a longer-tailed pair PI that clips more symmetrically (odd-order harmonics, more aggressive distortion character). Players who need the Princeton format’s small size and portability, but want the Deluxe’s headroom, face an unanswerable compromise: they are asking for things the Princeton cannot be. Pick the Princeton for recording and small venues; pick the Deluxe when you occasionally need to fill a medium room without PA support.
vs. Vox AC15C1 (Rank 398)
The AC15C1 is the natural alternative for players who want a mid-forward, small-wattage tube combo with natural breakup at moderate volume. It delivers 15W through an Alnico Blue speaker (or C12 ceramic in the standard version), uses EL84 power tubes and a topology that prioritises upper-midrange harmonic richness over the Princeton’s warm, even-order compression. The AC15 breaks up in a more aggressive, forward way; the Princeton’s breakup is rounder and more compressed. The AC15’s reverb is a digital spring emulation (in the C1 version) rather than a genuine spring reverb. If you like British mid-forward bite, the AC15 wins; if you want American warmth with Fender spring reverb, the Princeton wins.
Buying Guide: New, Used, and Vintage Alternatives
The ’68 Custom Princeton Reverb is available new from Fender authorised dealers at $1,469.99 USD as of July 2026. Sweetwater has units in stock and moving; Guitar Center lists it as a standard catalogue item. An Electric Blue limited-edition finish variant exists as a separate SKU (model 2272004000) at the same price point — same circuit, different cosmetics.
On the used market, expect to pay $750–$950 for a clean used ’68 Custom Princeton Reverb in good to excellent condition (Reverb.com pricing, July 2026). These amps are robust and well-built for Mexico-made PCB production; the main fault modes are speaker degradation on the Celestion Ten 30 (check for cone rub or hardened surround on older units), reverb tank connection issues (the RCA jacks on the tank are the most common fault point), and tired preamp tubes. None of these are expensive repairs.
The vintage silverface Princeton Reverb that the ’68 Custom cosmetically references runs $600–$1,200 for a 1968–1972 example in playing condition, with earlier drip-edge units commanding a small premium for their looks. A vintage silverface Princeton Reverb with a tube rectifier 5AR4 and an original speaker is a different-sounding amp from the ’68 Custom — usually cleaner, with less negative feedback reduction and a different speaker character. The ’68 Custom’s Bassman tone circuit is not found in vintage Princeton Reverbs. If you want the exact ’68 Custom circuit in a vintage shell, the ’68 Custom is the only way to get it.
Boutique alternatives in the Princeton Reverb format include the Tone King Imperial MKII ($2,999) and the Victoria Victoriette ($2,495). Both offer hand-wired construction, more speaker options, and higher build quality at significantly higher prices. For players who will tour heavily or who need a Princeton-format amp as their primary instrument for the next twenty years, the price premium is reasonable. For home recording, occasional gigging, and pedal-platform use, the ’68 Custom Princeton’s Mexico-made PCB circuit performs the job without demanding boutique investment.
Ownership Notes
Tube maintenance cadence. The 5AR4 rectifier tube is the one most players overlook. Replace it every 1,000–1,500 hours of use — a JJ or Sovtek 5AR4 costs $18–25 and is the most cost-effective way to maintain the amp’s characteristic sag compression. The 6V6 power pair should be replaced as a matched pair every 18–24 months under weekly gigging ($35–55 for a matched JJ pair). The 12AX7 and 12AT7 preamp tubes are low-stress and rarely need replacement; at five-year intervals or when a channel becomes noisy, start with the V1 12AX7 (the first stage, most likely source of hiss).
Bias adjustment. The ’68 Custom Princeton Reverb requires chassis removal to access the bias test points — there are no external trim pots. Target approximately 35mA per 6V6. This is not a job for players without electronics experience; find a competent amp tech. The amp is not self-biasing. When you change power tubes, rebias.
Reverb saturation. The reduced negative feedback means the reverb circuit saturates at a lower dial setting than on the ’65 Reissue. Around 5–6 on the reverb knob, the reverb trail begins feeding back on itself. This is not a defect — it is the expected behaviour of the modified circuit. Use reverb at 3–5 for musical results; above 5 is splash effects territory.
Bias tremolo vs opto-tremolo. The ’68 Custom’s bias tremolo does not have a photoresistor that ages and causes the speed control to become non-linear — that is an opto-tremolo issue (the ’65 Princeton Reverb Reissue uses opto-tremolo and does develop this problem). The bias tremolo is generally lower-maintenance but affects the output tube bias when engaged; at high tremolo depths, you may notice a slight hum when the tremolo is running. This is normal.
Speaker options. The stock Celestion Ten 30 is the right speaker for the circuit’s voicing. Players who want more clean headroom and less aggression often swap it for a Jensen P10R alnico ($90–110) — this brings the ’68 Custom sonically closer to the ’64 Custom. Players who want even more mid-range push sometimes fit a Weber 10F150T ($85–100). Either swap is straightforward and reversible. Keep the Ten 30 — it is worth knowing what the circuit was voiced for before modifying it.
PCB maintenance. The ’68 Custom uses a PCB (printed circuit board) rather than eyelet-board or point-to-point wiring. Sound On Sound noted this as the amp’s only significant drawback: “PCB-based, so DIY maintenance and further mods will be a little more difficult than with eyelet-board construction.” If you plan to perform your own mods (cutting the bright cap, adjusting feedback resistor values further, substituting capacitor values), it is achievable but requires PCB-level soldering skills. A hand-wired amp is considerably more mod-friendly.
External speaker jack. The rear panel has two parallel ¼” speaker jacks — one for the internal Ten 30, one for an extension cabinet. Connecting an external 8Ω cabinet while the internal 8Ω speaker is running drops the total load. Verify impedance compatibility before plugging in an extension.
Frequently Asked Questions
Is the Fender ’68 Custom Princeton Reverb made in the USA?
No. The ’68 Custom series — Princeton Reverb, Deluxe Reverb, Pro Reverb, Vibrolux Reverb, Twin Reverb — is manufactured in Mexico. The ’65 Reissue series (Princeton Reverb, Deluxe Reverb, Super Reverb, Twin Reverb) is assembled in the USA at Fender’s Corona, California facility. Both use PCB construction. Country of origin is a real distinction for tariff purposes, but for practical tone and reliability, the Mexico-made ’68 Custom is a well-built amplifier with no demonstrable deficiencies relative to the USA-made ’65 Reissue.
What does “Bassman tone circuit” mean, and why does it matter?
The classic Blackface Fender tone circuit (found in the ’65 Princeton Reverb Reissue) has a pronounced mid-scoop — a dip around 700 Hz to 1 kHz that gives Fender clean its airy, glassy character. The Bassman tone circuit, derived from Fender’s tweed-era Bassman amplifier, has less of this mid-scoop and more low-midrange presence. In practice, the ’68 Custom Princeton sounds thicker, warmer, and more mid-forward than the ’65 Reissue. Overdrive pedals that add their own midrange hump work better because those frequencies are not being scooped out by the amp. The trade-off is that the extreme top-end chimey sparkle of the classic Blackface tone is slightly reduced.
What is a “drip-edge” Princeton Reverb, and how does it relate to this amp?
The “drip-edge” era refers to Fender amplifiers made in 1967–1969 that feature an aluminium angle trim around the speaker baffle — named after the roof flashing (“drip-edge”) used in construction, which the profile closely resembles. CBS introduced this cosmetic detail when they replaced the Blackface panel with the silver panel in late 1967; it was dropped by 1969. The ’68 Custom Princeton Reverb recreates this specific cosmetic look faithfully: silver-and-turquoise front panel, aluminium grille cloth trim. The circuit inside is not a faithful recreation of a 1968 Princeton Reverb, however — it is a modified version with the changes described above. The “68” in the name refers to the cosmetic era, not circuit authenticity.
Can the ’68 Custom Princeton Reverb keep up with a full band without PA support?
At twelve watts through a ten-inch speaker, the honest answer is usually no — not with a drum kit and a bass amp in an untreated rehearsal room. On a stage with front-of-house PA support and a wedge monitor, yes, absolutely. The ’68 Custom has been used on stages far larger than most guitarists play, with Gary Clark Jr. running it as a secondary amp for smaller venues alongside his primary Vibro-King. As Sound On Sound’s Dave Lockwood wrote: “If your band is too loud for a Princeton, your band is too loud” — and this remains truer than ever in an era of decent PA systems and universal acceptance of miking amps on stage.
How does the ’68 Custom Princeton Reverb compare to the Fender Blues Junior IV?
The Blues Junior IV (Rank 400) is a 15W, 12″-speaker, PCB combo at a lower price point. Its EL84 power tubes produce a different character to the 6V6s in the Princeton — more compressed, more “British” in feel, with a different breakup texture. The Blues Junior lacks the Princeton Reverb’s cathodyne phase inverter warmth, its bias-modulated tremolo, and its genuine four-spring reverb. For players who want the specifically Princeton-flavoured character, the Blues Junior is not an equivalent. For players who need volume and budget, the Blues Junior is the more practical choice.
Is the ’68 Custom Princeton Reverb good for jazz?
Yes, with a caveat. The Bassman tone circuit’s extra midrange makes the amp slightly less ideally suited to the ultra-clean, treble-heavy jazz tone associated with a ES-175 into an original blackface circuit. But Premier Guitar’s Teja Gerken’s 2014 review made the same point in reverse: “The nice, fat jazz sound from the neck pickup had me reaching for my Real Book” — the amp’s warmth and compression suit jazz tone very well, and it remained clean to volume 4–5 with a humbucker-equipped ES-335. The cathodyne PI’s even-order harmonic saturation is warm rather than aggressive. For straight-ahead jazz at coffee-house to small-club volumes, the ’68 Custom works well.
What are common faults to check when buying a used ’68 Custom Princeton Reverb?
Check the reverb: insert a guitar cable into Input 1 and shake the amp gently. The reverb tank (mounted on the amp’s floor) should produce a splashing crash through the speaker. If it does not, the reverb RCA jacks may be corroded or the tank itself may have a broken spring — both inexpensive fixes. Check the tremolo by engaging it and listening for a clean rhythmic amplitude modulation; erratic or no tremolo usually means a tired tube (typically V3 or V4). Check for any crackling or static through the channel that changes when you rotate the Volume pot — this indicates a dirty or failing potentiometer, which can be cleaned or replaced. Finally, check the Celestion Ten 30 for cone rub by gently pressing the cone in and listening for a scraping sound; cone rub means a recone is needed.
Should I buy a ’68 Custom Princeton Reverb or save up for a vintage silverface Princeton Reverb?
They are not the same amp. A genuine 1967–1969 silverface Princeton Reverb with the drip-edge aluminium trim runs $650–$1,200 in playing condition, and its circuit is not the same as the ’68 Custom: the vintage unit has the original Blackface-adjacent tone circuit and standard negative feedback, producing a cleaner and chinier sound. If you want vintage Princeton Reverb tone, buy a vintage Princeton Reverb. If you want the Bassman-circuit, reduced-feedback, Celestion-speaker character that the ’68 Custom provides, buy the ’68 Custom — because that specific combination does not exist in any vintage Fender. Both answers can be correct simultaneously, depending on what you are trying to achieve.