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Gryphon Diablo 250 Class A Integrated Amp Boxed
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Posted On 3.04.2026
Last Update On 3.04.2026 Gryphon Diablo 250
Gryphon Diablo 250 Gryphon Diablo 250 Gryphon Diablo 250 Gryphon Diablo 250 Gryphon Diablo 250 Gryphon Diablo 250 Gryphon Diablo 250 Gryphon Diablo 250
Description Original Description is in English, other language texts are translations and can contain errors. EnglishDeutschSpanishTurkish Excellent condition with remote and packaging.

 

On paper, Gryphon's amplifier recipe is very simple: true dual mono operation for perfect channel separation; true class A operation for perfect linearity and an absence of switching distortion; massive heat sinks and even more massive power supplies for unlimited dynamics; and balanced circuitry for lowest possible noise. Obviously there must be a few secrets to this mix as otherwise anybody could/would design a Gryphon Colosseum. Nonetheless the fundamentals remain well known. What sets the brand apart from the few others who’d even venture into high-power true class A amplification is the ultimate level of refined execution.

Because of its more manageable footprint, higher power and targeted price, the Gryphon Diablo had to forego pure class A operation for class A/B yet its very significant heat dissipation has me suspect that it operates in class A well beyond the first 7 of its 250 watts (250 watts into 8, 500 into 4 and 800 into 2 ohms – impressive for a one-box integrated). The rest of the core recipe remains unaltered with double mono, balanced circuits, zero negative feedback and an oversized power supply. The beast’s front panel offers a very legible alphanumeric screen displaying the input (each can be independently named) and output level; and touch buttons to changing source and volume, mute and monitor and to access the setup menu. Amongst the menu’s hidden features is the ability to assign max and turn-on volumes (0 is default which is where I left it to avoid potentially loud surprises). The menu also allows for setting the third input as HT bypass to drive the Diablo’s power section directly from an A/V processor.

The back panel provides one balanced input, four RCA inputs, one set of fixed outputs and one set of variable outputs to connect to either subwoofers or a second amp. One of the inputs can be fitted with an optional MM/MC phono module but the review loaner was not so equipped (all phono comments were thus based on using either the Esoteric E03 or Nagra BPS phono preamplifiers). The speaker binding posts are massive custom affairs accepting spades or bananas without issue.This review page is supported in part by the sponsors whose ad banners are displayed below

For a reviewer it’s very easy to claim that a given component competes with or surpasses others twice as expensive whilst conveniently failing to identify the references. I have fallen for that trick too. For one thing it avoids unpleasant phone calls and emails. Although I won’t return to this, the Diablo in my system did best separates twice as expensive - not by much and valid only for listeners with my inclinations but very real nonetheless. On paper, Gryphon's amplifier recipe is very simple: true dual mono operation for perfect channel separation; true class A operation for perfect linearity and an absence of switching distortion; massive heat sinks and even more massive power supplies for unlimited dynamics; and balanced circuitry for lowest possible noise. Obviously there must be a few secrets to this mix as otherwise anybody could/would design a Gryphon Colosseum. Nonetheless the fundamentals remain well known. What sets the brand apart from the few others who’d even venture into high-power true class A amplification is the ultimate level of refined execution.

Because of its more manageable footprint, higher power and targeted price, the Gryphon Diablo had to forego pure class A operation for class A/B yet its very significant heat dissipation has me suspect that it operates in class A well beyond the first 7 of its 250 watts (250 watts into 8, 500 into 4 and 800 into 2 ohms – impressive for a one-box integrated). The rest of the core recipe remains unaltered with double mono, balanced circuits, zero negative feedback and an oversized power supply. The beast’s front panel offers a very legible alphanumeric screen displaying the input (each can be independently named) and output level; and touch buttons to changing source and volume, mute and monitor and to access the setup menu. Amongst the menu’s hidden features is the ability to assign max and turn-on volumes (0 is default which is where I left it to avoid potentially loud surprises). The menu also allows for setting the third input as HT bypass to drive the Diablo’s power section directly from an A/V processor.

The back panel provides one balanced input, four RCA inputs, one set of fixed outputs and one set of variable outputs to connect to either subwoofers or a second amp. One of the inputs can be fitted with an optional MM/MC phono module but the review loaner was not so equipped (all phono comments were thus based on using either the Esoteric E03 or Nagra BPS phono preamplifiers). The speaker binding posts are massive custom affairs accepting spades or bananas without issue.

The Diablo proved absolutely foolproof in use, the elegant remote allowing easy change of volume and source whilst controlling also mute and standby functions. Speaking of standby, here is my only practical caution. This amplifier sounds good out of standby but much better after 45 minutes of warm-up. I found it consistently better after 24 hours yet. By not running pure class A, it is conceivable to leave it powered up continuously for best sound even though that’s not the environmentally friendliest thing to do and certainly can make for cozy summer sessions since the Diablo runs warmer than my pure class A low-power FirstWatt F5. At minimum you’ll want to place the Diablo on a tall shelf with plenty of surrounding breathing room rather than build it into a wall or tight rack. The review loaner sat on an ASI HeartSong amp stand fronting all other gear and I would not put it inside the rack itself.

Not being a recent product release, I had the advantage over my fellow reviewers. I could peruse their findings before reporting mine. What struck me was thinking that we weren’t reviewing the same amplifier at all. One writer described the Diablo as cold and lacking in emotion. Another called it warm and organic, yet another neutral and fluid. The only thing we all seem to agree on is the phenomenal level of resolution, detail retrieval, ambience recreation and dynamics this amplifier is capable of. In an attempt perhaps to reconcile seemingly opposing views, I’ll add that the Diablo is utterly transparent to the rest of your system, chosen playback material included. This admittedly is something reviewers often say when otherwise feeling at a loss to describe a component’s sound more specifically. Even so, the Diablo had this quality more than any other component I reviewed to date. Everything and anything mattered when it came to the overall voicing of my system. Beware that if you fall for the Diablo's charms, you might spend a lot of time tweaking your system not because you need to but because you now can hear these often small differences so very clearly.

here are some aspects of the Diablo's sound that are its own. Starting with dynamics from massive explosions to the finest of micro fluctuations, this amplifier had the most explosive unrestricted range I have heard. 6moons regulars know that for two of our writers, one of our absolute references for low-level dynamics is FirstWatt’s F5 whenever a mere 25 watts aren’t a practical limitation. Microdynamically the Diablo was at least as nimble.

Muted string pizzicatos from Britten's Playful Pizzicato bristle no matter how low you listen over either amplifier. This translates into amazingly clear transients that are sharp in a good way. A harpsichord is probably one of the most challenging instruments to reproduce. Dull its needle-like attacks and it will sound like a dead toy piano. Over-sharpen them and get holes drilled into your temples. Switching to Padre Soler's Fandango and Sonatas with Scott Ross, a long-time favorite, the instrument was in the room no matter how low I turned down the volume.

The dynamic qualities of Scott Ross' playing remained intact. At very low levels his music eventually scaled down in size but the sharp pinch of the strings never dulled or rounded over as it does sooner or later over all amplifiers - even the F5.

Production line of Gryphon Colosseum amplifiers

Where the Diablo then simply trounced the Nelson Pass design was with macrodynamic explosions. The rise of both amplifiers seemed equally fast (a tad faster for the Diablo perhaps) but the Dane could differentiate dynamic levels to an even greater extent especially on the most massive of orchestral pieces. That was easy to hear. Take the last minutes of Saint-Saëns’ Symphony with Organ, an utter orchestral mayhem with the organ going pretty much all out yet at the very end still adding the kettle drums for the final thunder. With the F5, the drums entered. With the Diablo they exploded. There seemed no limit to where this amplifier could go.

Blasé readers will protest that 250 watts into 8 ohms versus 25 will typically do that. I would generally concur if it hadn’t been 97dB speakers and if the Diablo hadn’t simultaneously nailed the dynamic micro range. Excelling at the macro and micro both was unique in my book. The pure class A 50wpc Esoteric A03 into the same speakers for example struggled with low-levels rhythmic cues and even the 360wpc Genesis GR360 with its external MDHR power supply couldn’t quite match the Diablo at either end of the dynamic range. Percussive rise times weren’t quite as startling and micro detail blurred a little sooner than over the Gryphon.

I will spare you a disc-by-disc account of how much new detail I discovered. That list would be far too long. Scary to me was how I’d owned some of these discs for over twenty years and knew them over electronics costing upward of three times the Diablo. Still I heard new information especially on ambiance retrieval. The Diablo also gave me a renewed appreciation for the Esoteric X03SE. While I'd love to hear a good Firewire DAC and computer with this amp, based on how the Diablo responded to this source, I would not count out the X03SE disc player quite yet.

Pretending at more detail is easy with some strategic treble contouring. Where such acts usually fall apart is being faced with a live recording’s huge amount of ambience information. Recreating a credible impression of the recording venue takes true transparency across the entire frequency range plus impeccable phase and timing. Otherwise the illusion falls apart. This ability to recreate the event venue in your room as long as the information was recorded is probably the Diablo's second strongest virtue. The soundstage was huge left to right but also front to back. The Diablo projected about a quarter of the stage in front of the speakers. This took a little getting used to. Imaging was precise and defined but not in a systematic or overblown fashion.

Gardiner's recording of Bizet's Symphony with the Lyon orchestra is a perfect example of concert hall acoustics. The Lyon venue is slightly warm and reverberant and the Gryphon preserved all the small reverb that defines the hall boundaries to render the overall sonic balance quite warm. Switching to Saint Saëns' Urbs Roma Symphony recorded by Martinon at the La Madeleine church in Paris, one could also hear the hall acoustics and echoes but this time the old EMI mastering exhibited all the digital glare and brightness we've come to hate over the years. Two CDs from the eighties, two radically different sounds, one warm, one brash - the Diablo's only ‘fault’ was to not fix your or my collection of vintage recordings. If they are bright and brash, that's how the Gryphon will render them.

The Yamamoto A08s with its mighty two watts of direct-heated 45 triode goodness soundstaged just as well as the Dane and created the same 3D impression but in the end the Japanese SET was far more systematic in how it slightly overblew size and proportions and created a gentle cloud around the performers. The Diablo did not editorialize. If a cloud or blur were recorded, it would play it as such but if the musicians were recorded as discrete entities, it rendered them distinctly to a fault. On Yoyo Ma's Sony recording of Vivaldi's Cello Concerti which pushes multi miking to the point of having the various instruments not play in the same acoustic or partition at times, the Yamamoto A08s would recreate some cohesiveness that’s not really on the disc. The Diablo played it as disjointed as it is.

Why I stress this aspect—far from any fault to my ears—is because many readers have other expectations. They don’t necessarily want the truth if it renders their recordings less enjoyable. That's a perfectly valid and respectable endeavor. It’s simply not one the Diablo will support. The Diablo brings the concert into your room warts and bleached tones included. On the upside, that type of reproduction is absolutely thrilling when the recording is suitably brilliant.

I like Srajan's image of the woodblock to talk about imaging where different electronics carve out images in different ways, sometimes just as a 2D sketch, often as a slight relief, rarely as a true 3D figure that emerges from the block but never as a completely free entity whose back no longer connects to the wooden log. In this visual the Diablo was as close to a fully separated figure as I’ve heard. The FirstWatt F5 gave a good showing with fleshed-out living images but the Diablo went further by adding textures, which the F5 did not quite convey. The Genesis GR360 was more two-dimensional than either, not bad at all as far as amplifiers go. The other two and especially the Diablo simply operated in another league to be a delight for any visual listener.

The notion of textures segues into the Diablo's third virtue, which as the previous two stems from its amazing transparency to the recorded event. The Gryphon integrated could reveal instrumental textures like few others to provide tonal hues that were both vivid and nuanced. The Yamamoto A08s enhanced the tonal qualities of instruments and voices.

In my mind there’s no question that if you want that sound, the Diablo will not compete. Neither is it trying to. With the Diablo there are no enhancements. The qualities of a superior direct-heated triode cannot be beat in that realm. Conversely, the 45 triode enhances tonal qualities of everything in exactly the same manner whether you want it to or not. I still pull out the A08s whenever listening to especially older soprano recordings (older recordings that is as the singer’s age usually correlates less to listener fatigue even though the later Callas recordings do make a valid counter argument). When the recordings aren’t of the greatest quality, the Diablo's truthfulness could go too far over long listening sessions. That said, I have a similar response in lively concert halls and usually faster than at home where I can control the volume for personal comfort.

The Genesis GR360 came quite close to the Diablo on textures and truthfulness, was ever so slightly warmer and almost as resolved by clearly leaning in the same direction. The F5 too had the same gestalt and honesty while the Yamamoto obviously took the opposite direction of making music sound good even if it meant taking liberties and in some cases obscuring the qualities of the very best recordings. If the Yamamoto won on poorly recorded sopranos, the comparison brutally stopped when speaking of well-recorded voices. There the Diablo again rose above the fray. Whenever subtle nuances and inflections were recorded, the Gryphon amplifier would reproduce them more truthfully than any amplifier I know. Such a degree of transparency is quite amazing.

Maxime Le Forestier’s Plutot Guitar is a disc with closely captured voices and acoustic guitars. I always thought that the A08s gave the very best rendition possible and in many ways it does but the Diablo conveyed even more information about the recording venue with small echoes and decays whilst simultaneously sharpening guitar transients and not losing anything in vocal intensity. It was actually while listening to this disc that I understood how the Diablo combined the best qualities of each of my amplifiers into one single event. Not that it sounded like a 45 SET but it gave up nothing in midrange intensity and credibility while doing so much else so much better - an F5 with A08s traits + unlimited power.

The first question to anybody's mind when talking about electronics with a focus on absolute truth to how the event was recorded (which may be very different from how it was played) is whether emotions remain preserved or whether they get lost in an overdose of irrelevant data. Your mileage may vary but in my experience electronics that achieve a facsimile of utmost transparency through clever voicing, treble games and transient emphasis always fail the emotion test.

Those with true transparency to the signal preserve whatever emotion was encoded by not altering anything. Whenever the master tape captured a special moment, it will be heard probably more clearly than ever. Spicing with second-order harmonic distortion adds flavor but it won't be the original flavor. In this continuum, I found the Diablo to be tremendously expressive and involved when emotions were present. I always use two radically different albums to assess this very elusive quality. If at the end of this test I do not feel like crying, the gear failed me (which of course requires the right mind set to start off with and being available to utterly submerge in the music). The first one is the second movement of Vivaldi's Concerto for Cello KV419. Each time I hear it, I can't help wonder what occurred in Vivaldi's life at that juncture. The music is so deep and sad and unlike his other work.

The second is the Prayer Cycle by Jonathan Elias which in addition to being a tremendously well-recorded New Age vocal and instrumental piece carries all the weight of war and pain in its lyrics. Alanis Morisette’s and Nusrat Fateh Ali Khan’s poignant voices add to the haunting children choirs for an experience you won’t want to have when depressed. The Diablo passed the tear test by creating as deep a connection as I have ever experienced. When done right, transparency does not kill emotions. Au contraire. I experienced the same when reviewing Steve McCormack’s SMc Audio VRE-1 preamplifier, a component probably closest to the Diablo in being revelatory.

I came into this review with some preconceived ideas. The first one was simply that I had always loved what I heard from Gryphon at shows. That expectation was only reinforced by the time I now spent with the Diablo. The second was that while I expected a great component, the cynic in me also envisioned little chance that I would actually hear enough of a difference to justify the price delta with my $2.000 Wyred4Sound STP-SE preamp and $3.000 FirstWatt F5. Here I was wrong. The Diablo was not only the better-looking component with the superior finish but also sonically even more accomplished. The gestalt of the two systems was very close but the Diablo with its real-life power almost always went beyond what my pre/power duo could do - more speed, more decay, more realism, more macrodynamics, greater instrumental textures and deeper and more controlled bass.

Where I know the FirstWatt F5 for the amazing value it is and while I factor in how steep the curve of diminishing returns tends to get in hifi, I still must admit that the Diablo is worth its price of admission and then some. This makes it neither affordable nor best deal but here one encounters one of the few very high-end propositions where I would not be afraid to insist that you very much hear what you pay for. When you consider that a Vitus integrated is far dearer yet only offers 20 watts; or think of the relatively higher price of darTZeel's integrated or Behold's or Boulder's; then the Diablo does seem to offer a lot for the euro (and hopefully one day again also for the $). It certainly demonstrated how my MA2275 integrated was not even close. I had initially thought to run the two integrateds face to face but very quickly gave up on the notion. The McIntosh is simply not in the same league.

That said and money aside which will be the biggest hurdle for most—yours truly included— the Diablo is not for everybody. A component that is this transparent, linear and undistorted requires very careful matching both with the source and the speaker. Compatible sources are probably easier to come by as low-distortion high-resolution tonally saturated players are not that rare (think Gryphon's own or Cary and Esoteric to name a few obvious choices). The choice of speakers will be more critical. I was lucky that my Zu Audio Essence is tonally dense yet extremely dynamic to showcase those qualities of the Diablo. Even so, this clearly was no example of a common association. You will want speakers capable of great dynamics and transparency but not too bright or forward to avoid fatigue. You will want speakers capable of infinite midrange nuance to do the Diablo full justice. That's where my Zu falls a little short. Some of the newer Rockport designs would probably be a better match. You will also want speakers capable of deep and solid bass because the Diablo is extremely linear and lean by providing no upper bass reinforcement whatsoever. I suspect that when paired with monitor or bass-shy speakers, the overall tonal balance could quickly become top heavy (in those situations the Attila's more forgiving voicing might become preferable).

For the past year our editor has looked for an amplifier he could call a high-power FirstWatt F5. The Diablo is that and more. No, it does not ooze amazing value like the F5. Perhaps one fine day he or I will find that unique amp which is affordable, phenomenal and powerful. For now the Diablo has become my reference in that quest. If you know Franck Tchang’s LiveLine cables from personal experience or reviews, think of the Diablo as a LiveLine interconnect with gain and drive. The Danish amp had the same transparency, the same unrestrained sense of dynamics and nuances, the same lean deep articulated bass, the same deep connection to the recorded event’s vitality. The Diablo is music on hyper drive - exhilarating yet amazingly refined and nuanced. At any price, that’s a very rare combination.

I wish I’d heard more of the very high-end integrateds to make a final judgment call. I suspect that if I had, Gryphon’s Diablo might have walked off with a Lunar Eclipse award. It certainly eclipsed anything I knew before. Since I’m a little shy on relevant references, for now a Blue Moon Award will have to do. My highest recommendations go with it keeping in mind that the little Attila stable mate costs a third less, offers less power but is rumored to offer many of the Diablo's qualities with a touch of added warmth and forgiveness. That sounds like another winning recipe. For now though and a few more short weeks, I am savoring the amazing Diablo before it gets on its way again and joins the very short list of components I truly regretted to see depart.
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