November 2010 \ Reviews \ Amps \ Diezel Schmidt Amp Review

Diezel Schmidt Amp Review

Jordan Wagner

Blending vintage class-A British tones with modern feel in a heavy, rugged package


Premier Guitar November 2010

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Download Example 1
Channel 3 - High Gain
Download Example 2
Overdriven with Reverb
Download Example 3
Clean with Reverb
Clips recorded with a 1978 Gibson Les Paul Custom. Clean clip recorded with a 2008 Fender American Strat with Lollar S Special pickups.
Diezel Amplification burst on the scene in 1994 with the mighty VH4 and VH4S amplifier heads, which caused a stir when Adam Jones of Tool embraced them as part of his triple-amp stage and recording rig. Since then, Diezel amps have found favor with players including Neil Schon, Metallica, Buckethead, and Weezer, to name a few. Diezel amps are known for their power and definition, along with their quick attack, extreme versatility and their ability to stand out in the mix. But the company’s most recent creation, the three-channel, 30-watt Schmidt, represents a deviation from its high-gain, fire-breathing brethren with a Class-A power section and more vintage-styled tone options.

Hefty Tone
If you’re in the market for amplifier that’s light in weight, it might be wise to pick up a Schmidt head before deciding to purchase one. The amp head itself weighs a little over 46 pounds, making it a bit hefty for loading in and out of gigs and studios. It’s only 13 pounds lighter than Diezel’s high-gain monster Herbert, and weighty enough to remind me of lugging around an old Ampeg SVT from the late ‘60s that I used to use from time to time. Regardless of weight, the amp head was quite handsome. Visually it has a lot in common with older Mesa/Boogie Mark series heads, with a tall, deep cabinet that’s still narrower than most full-size amplifier heads.

Simple is as Simple Does
The Schmidt is simple by Diezel standards. Three channels are controlled by two sets of equalization and tone-shaping controls, along with a lone set of gain and volume knobs that alter the third (or More Crunch) channel’s sound. The circuit itself is built around two totally independent preamps. The first channel is a straightforward clean channel, with controls for reverb, bass, midrange, treble, and volume. The second is for low to moderate high gain and features identical controls save for an additional knob for preamp gain. Finally, the third channel is built for ripping high gain tones. It shares the equalization section and reverb of the second channel, but has its own gain and master volume knobs to give the player the option to cut or boost the volume when the channel was engaged.

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Comments

(6 comments) display by
UsernameComment
SRV
on 12/16/2010
$4,000 is a TOTAL JOKE! LOL and OUCH!
Babyblue
on 12/10/2010
Not true! Class A refers to the way the power tubes are biased and has nothing to do with the the way they are connected to the transformer. The Schmidt and AC30 are indeed Class A amps, however they are configured in a push-pull output configuration not signle-end. True, a push-pull configuration does cancel second-order harmonics whereas single-end does not.
Incidentally, you can also have a "single-ended" configuartion using two power amps connected in parallel. Single-end refers to the way the power tube(s) are connected to the transformer. Usually single-ended amps are lower-powered amps with just one power tube. This is usually the case, becasue single-ended amps with two power tubes running parallel are inherently quite noisey. The Hi-Watt Custom 20 is an example of a class A, single-ended with dual El 84 running in parallel.
Guytron
on 11/25/2010
Dave B is correct. But I'd also like to add that even if this amp was indeed Class A it wouldn't sound much different -especially considering its push pull.
Push pull cancells out the even order harmoics that the power amp produces regardless of the Class of operation(Class A , Class A/B or Class B)...
Jordan
on 11/18/2010
Dave B, can you please explain further? Peter Diezel himself describes the Schmidt as a Class A amplifier.
Sha
on 11/12/2010
Gotta say... I've been waiting for a major magazine to cover this particular amp for a while in English. Thanks for going where no one has gone before!
Dave B.
on 11/12/2010
please stop using the term "Class A" when an amp isn't. This amp - isn't. Maybe "cathode biased" and "no feedback loop" (if it doesn't have one) apply - but it's not Class A. A Vox AC30 is not class A. The Vox AC-2, AC-4, the Thomas Organ-mfr'd Pathfinder, and whatever other single output tube Vox amps that were made are by definition Class A. None of the others are.



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