Nineteen-ninety-two was the year the high-gain tube amp went supernova. Twelve months, several competing contenders, and the sonic landscape of rock and metal guitar changed irrevocably. The Peavey 5150, the Mesa/Boogie Dual Rectifier, the Bogner Ecstasy, the VHT Pitbull Ultra Lead — all of them dropped in that same twelve-month window, each one staking a different claim on what “modern high-gain” could mean.
And then there was the Diezel VH4.
Where most of those amps offered two or three channels and one dominant sonic personality, Peter Diezel arrived with four fully independent channels — each with its own preamp stage, its own gain control, its own EQ stack, its own insert loop — in a single box. It was, by any measure, the most architecturally ambitious amp of that extraordinary year. It was also, almost immediately, the one that Tool’s Adam Jones, Metallica’s James Hetfield and Kirk Hammett, and the Smashing Pumpkins’ Billy Corgan reached for when they wanted a rhythm tone that could cut through any mix on the planet.
Three decades later the VH4 is still in production. Still made, per Diezel’s own literature, “the exact same way as in 1992.” In a world of digital modellers and amp-in-a-box pedals, a hand-built German EL34 head at a boutique price point should be a relic. Instead, it’s a reference standard.
This is the story of how it got there — and how to make the most of one if you’re lucky enough to own or borrow it.
Peter Diezel and Peter Stapfer: Two Peters, One Amp Empire
Peter Diezel grew up playing guitar in Munich’s rock scene during the 1980s. Like most guitarists of that era, he was running through Marshalls. Unlike most guitarists of that era, he wasn’t satisfied with what came out of the box. He began modifying them — first for himself, then for other players who heard what the modifications could do. Word spread in the way that word spreads in tight-knit musician communities: not through advertising, but through sound. The queue of players asking for his mods kept growing until the queue became impossible to ignore.
In 1992, Peter Diezel formalised the operation. Together with Peter Stapfer — who brought the business and organisational infrastructure that any guitar-amp-building Peter Diezel needed — they founded Diezel Amplification GmbH in Bad Steben, a small town in Bavaria. Stapfer is a co-founder and company director, not a famous player. His contribution was structural: without a Peter Stapfer to build the company around the amps, there is no Diezel Amplification. He’s just not someone you’d catch in a rig rundown.
The first VH4 prototype was completed in 1994. The concept was ambitious to the point of seeming reckless: four channels, each one a discrete preamp with its own voice, gain structure, three-band EQ, and insert loop. No shared signal paths. No compromise voicings. Four amps in a box, united only by a shared power stage and a shared enclosure. Peter Diezel wanted every channel to sound like someone had purpose-built it for a specific use case — and that is exactly what he built.
The lab and factory moved from Munich to Bad Steben in 2003, where Peter Diezel still works and lives. The VH4 has been refined over thirty-plus years but its fundamental architecture — the circuit topology that makes it sound the way it sounds — remains unchanged from the original design.
The Architecture: Four Preamps in a Box
Understanding the VH4 starts with understanding what “four channels” actually means here. On most multi-channel amps, “channels” are variations on a theme: shared EQ topology, shared power stage interaction, shared fundamental character, with gain and voicing as the main differentiators. A two-channel amp is one amp with two gain structures. A three-channel amp is two variations on a platform plus a clean.
The VH4 is four separate preamp circuits sharing a power section. Each channel was voiced independently, from the circuit level up, to achieve a specific goal. The result is an amp that does not behave like a Swiss Army knife — where no tool is ideal — but like a case of four purpose-built instruments that happen to share a chassis.
The power section is equally considered. One hundred watts from four EL34 or KT77 output tubes, with a master volume that begins adding power amp distortion past the one-o’clock position, a global Presence control centred at 4kHz, and a “Deep” knob — an active bass boost centred at 90Hz that adds low-end punch without muddying the midrange. Each power tube has its own fault indicator LED and its own fuse; if a tube fails mid-set, the fuse blows and takes only that tube out of circuit, allowing the amp to continue functioning on three tubes until the repair can be made. That kind of engineering pragmatism is the Diezel signature.
Switching is handled entirely by MIDI. The VH4 ships without a footswitch, because Diezel’s position is that players have widely varying switching needs and a bundled footswitch would serve almost nobody well. The Diezel Columbus MIDI Switcher is the purpose-built option; any MIDI controller works equally well.
The Four Channels in Detail
Channel 1: Clean
The Clean is not a neutral signal path — it has a character of its own. At low gain settings it produces what has become known as the “Diezel sparkle,” a clear, wide-bandwidth tone with an airy top end and genuine low-end body that most clean channels sacrifice for brightness. Increase the gain and the Clean moves toward what Peter Diezel himself describes as the Townshend/Hiwatt zone: a robust, harmonically dense driven sound that is clean by high-gain standards but absolutely not by studio standards. John Fogerty uses the Clean channel of a Diezel VH4 live to replicate the crystalline character of his old Kustom K200A amps from the Creedence Clearwater Revival era — which tells you something about how clean “Clean” actually is when gain is kept modest.
Channel 2: Crunch
The Crunch begins where the Clean leaves off on the gain dial. Its range covers vintage rhythm sounds through to what Diezel’s own description calls “glorious AC/DC-style rhythm and lead sounds.” It is the channel most reminiscent of a driven British amp — touch-sensitive, dynamically responsive, capable of cleaning up significantly when you roll back the guitar’s volume. It is not the channel anyone writes about, but it is often the channel that makes the VH4 genuinely usable across a full gig rather than just one genre.
Channel 3: Mega
This is the channel that made the VH4 famous. The Mega is Diezel’s trademark — a high-gain rhythm sound with focused, tight bass, a lower midrange push that sits perfectly under a band mix, and a treble character that cuts without thinning. Guitar World’s Chris Gill, writing in March 2026 specifically about the VH4’s legacy, identified the Mega as the channel that “has played a major role in heavy guitar tones since the early ’90s.” It is the channel Adam Jones parks on and leaves there for an entire Tool show. It is the channel James Hetfield runs in combination with his Mesa IIC+ to construct the layered Metallica rhythm sound. It is why the phrase “VH4 Channel 3 tone” appears in approximately every serious discussion of modern metal guitar.
What makes the Mega distinctive is that it achieves its high-gain character without sacrificing note definition. Most very high-gain amps compress the transient so aggressively that rhythmic precision becomes a function of the player’s attack rather than the amp’s response. The Mega stays articulate at high gain levels — individual note attacks retain their shape within a chord, which is the precise property that made it the weapon of choice for Hetfield’s percussive down-picked rhythms and Jones’s mathematically complex polyrhythmic figures.
Channel 4: Lead
The Lead carries over from the Mega’s tonal foundation and adds more gain, more compression, a fuller bottom end, and a smoother top end. Diezel’s description: “creamy, authoritative, loud.” It is a lead channel that prioritises sustain and smoothness over attack and definition — the logical complement to the Mega’s articulate rhythmic precision. Run them in sequence via MIDI switching and the VH4 provides a complete rhythm-to-lead system from a single amp without any sonic discontinuity between the two characters.
Full Specifications
Famous Players
Adam Jones (Tool)
Adam Jones has been running two Diezel VH4 100-watt Blueface heads in conjunction with a hot-rodded 1976 Marshall Super Bass and Mesa Boogie 4×12 cabinets for the better part of Tool’s live career. The rig rundown has been documented in multiple independent sources: Mixdown Magazine’s gear feature is explicit that Jones’s live setup “employs two eardrum-rupturing Diezel VH4 100 watt Blueface heads.” Engineer Joe Barresi, who recorded Tool’s 10,000 Days (2006), described Jones’s amp setup to Mixonline directly: “He has a Marshall that he loves, a Diezel, and then he was using a Mesa Boogie at one point.” The cabinets were predominantly Mesa Boogie 4×12s for their low-end performance, with the Marshall head routed through a Marshall cabinet and supplementary heads through their respective enclosures.
Jones’s approach to the VH4 in a live context is methodical: he stays on Channel 3 — the Mega — and does not switch channels during the show. The amp’s character does the work. This is why the VH4’s articulation under high gain is so critical to his sound: Tool’s guitar parts require rhythmic precision that most very high-gain amps would compromise. The Mega delivers the density Tool demands without losing the note-separation that makes those parts actually function.
James Hetfield and Kirk Hammett (Metallica)
Metallica’s post-Metallica (The Black Album) rhythm-guitar sound was built on a combination of the Diezel VH4 and Mesa/Boogie amplifiers — primarily the IIC+ for Hetfield’s rhythm foundation. Guitar World explicitly confirmed both Hetfield and Kirk Hammett as frequent users of the Mega channel. Hetfield’s guitar tech Chad Zaemisch has confirmed the dual-amp VH4/Mesa setup in production documentation. The two amps serve different frequency roles: the Mesa IIC+ contributes more high-end bite and definition, the VH4 provides the low-focused weight and midrange authority — together they produce the “full-range sound with crossover in the mids” that characterises Metallica’s live and modern-era studio tone.
By the time Metallica’s production scaled to arena-level touring, the physical amps were running into Fractal Audio Axe-FX II units — the IRs and modelled versions of both the VH4 and Mesa Rectifiers, processed through Matrix solid-state power amps. This is standard large-venue practice for consistency and recall, not a departure from the VH4’s contribution. The VH4’s character is built into those IR captures; the amp itself set the sonic template.
Billy Corgan (Smashing Pumpkins)
Billy Corgan purchased a Diezel VH4 in 1999 or 2000. According to the Smashing Pumpkins Fan Collective gear database — one of the more rigorously sourced player-instrument registries in the fan community — the VH4 was used on the Machina/The Machines of God tour in 2000, through the Zwan album and 2001–2003 touring cycle, and was documented again at the Smashing Pumpkins’ Metro Chicago show on 27 July 2010. Corgan ran two VH4s for the Machina period. In more recent years he has used a custom VH4 preamp section built by Salvation Mods for his live rig — a hardware testament to the circuit’s continuing relevance even as formats evolve.
Corgan’s use of the VH4 is notably different in context from Jones or Hetfield. The Smashing Pumpkins’ production aesthetic — thick, layered guitars, shoegaze-adjacent density, melodic distortion rather than percussive chug — demonstrates the VH4’s range beyond purely rhythmic metal applications. The Mega channel’s defined bass and midrange push translate equally well into dense, harmonically saturated rock production.
Peter Stapfer — Co-Founder, Not Player
He is not a player. He is the co-founder of Diezel Amplification GmbH — the other Peter in the company’s origin story. The confusion likely arises because his name appears on Diezel’s original company registration and corporate history, which distributes through gear databases alongside artist associations. The distinction matters: without Peter Stapfer’s organisational contribution, there is no production-scale Diezel Amplification. He is part of the VH4’s story at the company level, not the guitar-rig level.
Additional Verified Users (Brand Level)
The VH4’s reach extends well beyond the three primary verified players above. Guitar World’s 2026 retrospective named Dave Mustaine (Megadeth), Matt Bellamy of Muse, Munky and Head of Korn, and the Mastodon pair of Bill Kelliher and Brent Hinds as frequent Mega channel users. Warren DeMartini, Chris Impellitteri, and George Lynch have used the Lead channel’s smooth, compressed character for soaring, sustaining lead tones — the contrast to the Mega’s rhythmic precision being the point. Mark Tremonti, Wes Borland, and Neal Schon round out a roster that spans nu-metal, progressive rock, and classic AOR. And then there’s John Fogerty, who uses the VH4’s Clean channel for country-rock gigs, which is either the most unlikely endorsement possible or the clearest proof that this amp doesn’t actually have a stylistic ceiling.
Tone Recipes and Settings
Recipe 1: The Adam Jones Mega Crush
This is the closest publicly documented approximation to Jones’s live Channel 3 setup. Set the Mega channel’s Gain to 5–6, Bass to 5, Middle to 6, Treble to 5.5, Volume to taste. At the power amp, run the Presence to around 3–4 and the Deep to 4 for low-end body. Gibson humbucker guitars — especially anything with a Seymour Duncan JB in the bridge — respond best to this setting; single-coils will need the Middle pulled back to around 4.5 to prevent mid congestion. Run the output into a 4×12 loaded with Celestion Vintage 30s for the closest match to Jones’s Mesa Boogie cab voicing. No boost pedal in front — the Mega’s preamp stage does not need or benefit from a tube screamer at this gain level; all it does is remove low-end clarity and add artificial mid compression that the VH4’s own character renders redundant.
Recipe 2: Metallica Dual-Amp Rhythm Simulation (Single Amp)
To approximate the Hetfield dual-amp voicing from a single VH4, use Channel 3 at moderate gain (4–5), push the Bass to 6 and the Treble to 6.5, pull the Middle back to 4. At the power amp, engage the Deep control at 5–6 and run Presence at 5. This EQ spread compensates for the absence of the IIC+’s high-end contribution by tilting the VH4 slightly brighter than Jones’s setting without losing the Mega’s low-midrange authority. Heavy-gauge strings (.011–.049 or heavier, drop D or Eb) lock the low end in place. The result is not an exact Metallica replica — that genuinely requires the dual-amp interaction — but it gets the same frequency distribution into a single head.
Recipe 3: Billy Corgan Dense Rock Wall
Channel 3, gain at 6–7, Bass to 5.5, Middle to 5, Treble to 6, Volume moderate. At the power amp, Presence to 5, Deep to 4. A touch of parallel reverb in the VH4’s parallel loop — not series reverb, which muddies the attack — adds the spatial quality Corgan’s recorded tones consistently demonstrate. Pair with a Les Paul Custom or any mahogany-body humbucker guitar; the mahogany warmth balances the Mega’s tighter bass response and produces the slightly rounded, harmonically saturated quality characteristic of Corgan’s Pumpkins studio tone.
Recipe 4: Crunch Channel Vintage British
Channel 2, Gain to 4, Bass to 5, Middle to 7, Treble to 5. No additional drive pedal. Master at the point where power amp saturation begins contributing (approximately one o’clock). The Crunch in this configuration produces a tone that borrows from classic British overdrive without directly imitating any specific British amp — it has its own character, slightly more focused than a cranked JTM45, slightly less compressed than a JCM800, with a midrange presence that sits in the mix rather than against it. This is where the VH4 exposes its full range to players who assume it is purely a metal machine: this tone is blues-rock through and through, and it cleans up completely when you roll back the guitar’s volume knob to 6.
Recipe 5: John Fogerty Clean
Channel 1, Gain to 3–4, Bass to 4.5, Middle to 5, Treble to 5.5. Master volume low enough to stay below the power amp distortion threshold. Deep at 3, Presence at 4. Run into a 1×12 or open-back 2×12 rather than a sealed 4×12 — the Clean channel’s natural sparkle is better represented by a less bass-heavy cabinet. This is the setting in the vicinity of what Fogerty uses to replicate his old Kustom K200A solid-state sound from the CCR era. The fact that a boutique EL34 tube amp can convincingly approach the character of a transistor combo says something either about the Kustom K200A’s circuit behaviour or about the VH4 Clean channel’s unusual neutrality at low gain. Possibly both.
Comparisons: The High-Gain Class of 1992
The VH4 arrived in the same twelve-month period as several amps it is frequently compared to. Understanding the differences helps place it in any rig decision.
The Bogner Ecstasy 101B is the closest in architectural ambition — three channels, hand-built, boutique American construction, similarly transparent in its relationship between guitar character and amp output. But the Ecstasy’s voice is more open and three-dimensional where the VH4’s Mega channel is more focused and punishing. The Ecstasy rewards players who want a boutique interpretation of British and American tones; the VH4 rewards players who want the VH4. They are not interchangeable and both are worth owning.
The Bogner Überschall Twin Jet targets the ultra-high-gain end of the same market with a different philosophy: massive KT88 output power, a gain channel that makes no concession to vintage tonality, a sound designed for modern heavy music without the retro-British heritage of the Ecstasy. Where the VH4’s Mega channel retains articulation and note separation at high gain, the Überschall’s architecture compresses more aggressively and produces a denser, more saturated character. Different tools for different objectives.
The Bogner Helios 100 — released twenty years after the original VH4, as Bogner’s 25th-anniversary head — demonstrates what a designer focused on vintage-Plexi recreation sounds like. The Helios is dynamic, raw, and responds to picking attack with the kind of sensitivity that makes every note-articulation choice audible. The VH4 Mega channel is the opposite philosophy: it provides a platform where the player’s technique determines articulation, but the amp’s fundamental character is consistent. One rewards nuance; the other rewards aggression.
The Soldano SLO-30 — the compact iteration of Mike Soldano’s original SLO-100, another 1992 contemporary of the VH4 — offers a different American-voiced high-gain character: more nasal, more compressed in the midrange, with the DC-heated preamp tubes providing an extremely quiet noise floor. The SLO’s lead channel is arguably the single best companion to the VH4’s Mega in a dual-amp rig: their frequency characters are complementary without overlapping, and their dynamic behaviours contrast in useful ways.
Against modern multi-channel alternatives — the Mesa/Boogie Mark V, the ENGL Savage 120, the newer Friedman lineup — the VH4 continues to differentiate itself through its per-channel insert system and its MIDI-first design philosophy. No other production amp offers four discrete signal-chain insertion points; for players who need to run specific effects through specific channels without them affecting other channels, the VH4 remains without parallel.
Buying Guide
The VH4 is a current production amp, available new from authorised Diezel dealers (US: Sweetwater and selected independent boutique retailers; Europe: direct through Diezel’s distributor network). New price in the US market for 2026 sits at approximately $4,499–$4,699 for the head alone; the cabinet is purchased separately.
The used market is a legitimate option. The VH4’s production history spans more than three decades and the circuit topology has remained consistent, which means a 2005 VH4 and a 2025 VH4 are fundamentally the same amp. Key things to check on a used example: tube condition (EL34s last 2,000–3,000 hours under normal playing conditions; a VH4 that has seen heavy touring use may need a retube), per-tube fault indicators (press the Test button; any red indicator suggests the corresponding tube needs replacement), and the effects loop jacks (the parallel loop return has its own volume knob on the front panel — confirm it functions correctly). The MIDI switching circuitry should be tested with an actual MIDI controller before purchase; MIDI hardware is reliable but connector problems are common in used amps.
Early “Blueface” VH4s — identifiable by their blue silk-screened control panel labelling, produced roughly through the late 1990s and early 2000s — are specifically sought after by players who want the character of Jones’s and Hetfield’s documented period rigs. The difference between a Blueface and a current production VH4 is often described in forum discussions as subtle variations in mid character and dynamics, with Blueface examples said to have a slightly more open quality in the upper-midrange. This is partially subjective; the circuit differences between production runs are not documented publicly. If you find a Blueface in good condition and it sounds right to your ears, its provenance is the secondary consideration.
Budget entry point: the Synergy Amps VH4 module — a licensed single-space preamp version of the VH4 circuit designed for the Synergy modular preamp platform — provides access to the VH4’s Channel 3 Mega character at a significantly lower price point. It is not the full VH4 experience, but it is genuinely the VH4 circuit, not a simulation, and it is useful for players who want to explore the character before committing to a head.
Living With the VH4
The VH4’s MIDI-only switching is the single most common practical friction point for new owners. If you do not already have a MIDI controller in your rig, budget for one. The Diezel Columbus is the native option; Boss ES-5 and Line 6 Helix Control are commonly used alternatives that handle the MIDI channel recall the VH4 requires. The amp does have a front-panel toggle that allows manual channel selection during setup and practice, but for any live application where switching speed matters, MIDI is not optional.
The parallel effects loop requires specific attention. The front-panel parallel loop volume control determines how much of the effects return signal is blended back in — this is not the same as the series loop, which is fully in or fully out. Running the parallel loop return volume too high introduces noise; keep it below unity gain unless you have a specific reason to push it. When the parallel loop is not in use, leave it disconnected — unlike some amps, the VH4’s parallel loop does not need a dummy plug when empty.
Speaker cabinet selection matters significantly with the VH4. The Mega channel’s low-end focus benefits from a tight, controlled cabinet response; Diezel’s own 4×12 cabinets loaded with Celestion G12K100 speakers are designed specifically for this purpose. Mesa Boogie Standard OS 4×12 cabinets — which Jones has used — provide a similar tightness with a slightly more scooped voicing in the low-mids. Vintage 30 4×12s work well but add their own 1kHz presence peak that stacks with the Mega’s upper-midrange; adjust the Treble control down by 1–2 on the dial when using V30-loaded cabs.
Power tube life: EL34s under heavy playing conditions last roughly 1,500–2,500 hours. The VH4’s per-tube fault indicator system takes the guesswork out of this — when a red indicator appears, that tube needs replacement. Bias the replacement tubes; the VH4 has a bias adjustment access point and requires approximately 35–40mA per tube for standard EL34s. If you’re not comfortable biasing tubes, a qualified tech should do this; it takes fifteen minutes and it matters for both tone and tube longevity.
The 100-watt output is non-negotiable. There is no power-scaling option on the VH4, no half-power switch, no power soak built in. For home recording or practice, you will need either an external attenuator (the Two Notes Torpedo series is well-matched to the VH4’s output impedance) or a load box with IR cabinet emulation. Running the VH4 at full power through a 4×12 in a bedroom is not a realistic proposition unless your neighbours are extraordinarily tolerant or very far away.
Frequently Asked Questions
What does “Blueface” mean for a Diezel VH4?
Blueface refers to early production VH4s with blue silk-screened control labelling on the front panel, produced roughly through the late 1990s and into the early 2000s. Adam Jones’s documented VH4s are Blueface examples. Some players attribute a slightly different mid character to these earlier units, though Diezel has never published circuit-change documentation to confirm what, if anything, changed between production runs. A Blueface VH4 in good condition is a legitimate collectable; expect to pay a premium over standard used pricing.
Can the VH4 do clean tones?
Yes, and more convincingly than most players who associate it only with the Mega channel expect. The Clean channel’s low-gain sparkle is genuinely usable for country, blues, and funk applications. John Fogerty uses it live to replicate Kustom K200A solid-state character from the Creedence Clearwater Revival era, which is the least expected endorsement possible but the most useful evidence of what the Clean channel is capable of.
Does the VH4 need a boost pedal in front?
The Mega and Lead channels do not need or benefit from a tube screamer or boost pedal for gain — they have more than enough on tap internally. A tube screamer in front of the Mega channel adds artificial mid compression and removes low-end clarity that the channel is engineered to deliver. For the Clean and Crunch channels, a transparent overdrive or treble booster can extend their range, but the primary reason to put a pedal in front of a VH4 Mega is tone shaping (EQ, compression character), not gain.
What guitars work best with the VH4?
The Mega channel’s character pairs most naturally with high-output humbuckers in mahogany-body guitars — Les Pauls, SGs, and similar platforms. Gibson Custom Shop and standard Les Paul Customs dominate the confirmed VH4 user list for a reason: their midrange density is a natural match for the Mega’s voicing. Single-coil guitars can work, but require EQ adjustment (lower Middle, higher Treble) to prevent congestion. Extended-range guitars (seven- and eight-string) in lower tunings benefit specifically from the Deep control’s active bass enhancement at 90Hz — it provides a sub-bass extension that standard presence controls do not address.
How does the VH4 compare to a Mesa/Boogie Rectifier?
They are both high-gain amps in the same price tier, but they do different things. The Rectifier’s character is more compressed and spongy at high gain, with a famously “brown” warmth that comes from its silicon rectifier and EL34/6L6 power section interaction. The VH4 Mega is tighter, more punching, more note-defined at equivalent gain settings. Hetfield runs both simultaneously in his live rig precisely because their characters are complementary rather than redundant: Mesa below, Diezel above, both locked together for a broader frequency picture than either delivers alone.
Is the VH4 suitable for recording?
Yes, with the caveat that 100 watts into a 4×12 at recording levels requires either a speaker simulator/load box or a studio that can physically accommodate that volume. The VH4’s character translates well to DI recording via the Two Notes Torpedo or similar load boxes with impulse response cabinets. Engineer Joe Barresi’s documentation of Jones’s 10,000 Days sessions — using SM57 and Sennheiser MD421 on every 4×12 cabinet — demonstrates the amp’s studio viability at source level for anyone with appropriate room dimensions. The per-channel inserts allow rack-effect integration that is genuinely useful in a studio routing context.
What is the difference between EL34 and KT77 in the VH4?
The VH4 ships with EL34s as standard; KT77s are a drop-in replacement that Diezel supports. KT77s tend to produce a slightly tighter bass response and a more aggressive upper-midrange character compared to EL34s — they retain the fundamental EL34 family character (British, harmonically complex, less compressed than 6L6) while extending the amp’s responsiveness to transients. Many players describe KT77-loaded VH4s as having a “cleaner” high-gain character — more note separation at the same gain settings. It is a subtle difference that rewards experimentation rather than prescription; try both and decide based on what you hear in your own rig.
What is the VH4 price on the used market?
Used VH4 heads (current production era, non-Blueface) typically appear in the $2,800–$3,600 range in the US market in 2026, depending on condition and included accessories. Original Blueface examples in excellent condition command $3,200–$4,200+ due to collector interest. The Synergy Amps VH4 module offers the channel 3 Mega circuit as a licensed preamp module for considerably less — a sensible audition platform before committing to a full head purchase.