Bought a used Dr. Z amp?

We can bring your used Dr. Z amp up to spec. We offer the following services:


  • $105
    Includes a a full QA of your amp. We will check wiring, solder joints, caps, resistors, jacks, pots, ground points, tube sockets, transformers as well as bench and play-testing your amp.


  • $105+tubes
    Includes full check-up plus new tubes and bias


  • Check available mods here

Amp Updates (older models with attached AC cord)

Bring your used amp up to current voicing specs. Price includes parts, labor and QA.

  MAZ 18 NR

  • $140
    Current production voicing

  MAZ 18

  • $199
    Current production voicing

  MAZ 38 NR

  • $130
    Current production voicing

  MAZ 38

  • $199
    Current production voicing


  • $150
    Bass reduction & current production voicing



Amp sounds really good.  I’m really happy with what you did to it.  Great job!  I installed it back into the cabinet last night and played with it for about an hour.  Also, thanks for sending the clip.  It really helped me know what to expect.”

Andy Z.Owner of a 2005 MAZ 18 NR

“Just put the amp back together and I am LOVING IT! Am I wrong or is there not only a lot more master volume output, but CLEAN output?! HOLY COW! Nice Work!”

Joel D.Owner of a 2008 Maz 38

“Hi Don,

The amp sounds great, I just played a gig with it this weekend! Thank you for all your hard work.”

Erik N.Owner of a 2009 Maz 18 NR

“Amp arrived safely and VERY pleased! Good work. Thank you.”

David C.Owner of a 2004 Maz 18

“The amp sounds amazing and the reverb install was easy! Thanks for all your help. What goes into bringing the amp up to current spec? Thanks again!”

Paul F.owner of a 2007 Maz 38

“Hi Don, I just got back to the US last night and have played for an hour with the amp. Sounds terrific again! Much appreciated!”

Matt F.Owner of a 2001 Maz 38

“Don, I don’t know you how guys did it, but you managed to make a great amp sound amazing. I am very pleased. Glad I went for the upgrade, and glad I bought the Maz in the first place. Thanks very much.”

John B.Owner of a 2004 Maz 38

“Good Morning
I got the amp on Friday night….
Dude this thing sounds unbelievable…..
Reverb is definitely quiet and actually sounds deeper than previously….
The Amp itself sounds much more open and extremely touch sensitive than ever before….
The Bypass mode is insane….I can easily coax feedback and enhanced guitar volume control is killer…
I have owned three previous Maz 18’s all but one with reverb….this sounds better than any of the previous models
Thinking about buying a new combo version or at least in the 38 watt configuration….
Thank you for spending the extra time on this beast….will send you a picture with my other Z gear….”

Mike MartosOwner of a 2001 MAZ 18 Head

“I got the amp yesterday and got to sit down with it last night. All I can say is wow!! It is EXACTLY what I was hoping it would be. Throaty growl with plenty of headroom. The EQ bypass is awesome. Anyway, thank you for all your work. I love it!!!”

John CantrellOwner of a 1995 MAZ 38 "Invasion"

“My MAZ 18 sounds better than it ever has! Clean and crisp as always, but with a touch of ‘hair’ at a lower volume than I have ever heard. And the reverb is the best ever!
Thank you very much for your efforts – I will be looking for opportunities to send more stuff your way!

Thanks again, and keep things hopping in Cleveland!”

Robert GruenlohOwner of a 2003 MAZ 18 head


Just to let you know, after I have given my amp several weeks of ‘field testing,’ that the amp works better than when it was new. Thanks much for fixing my amp.”

Russ C.Owner of a 2002 Maz 18

“Hi Don,

just wanted to write you back with my thanks for the great work. The amp is exactly how you described in email and what I asked for. Admittedly I was used to it being less bright, but I also noticed that mine was less bright then most other Maz 18’s I have played including the other one I own. However the range of control in the preamp section is much wider now, so I can dial in a warmer sound, which I tend to like. Also its back to having the power and physical presence that I’m used to. Its really one of the best amps ever made. Thanks again. Well done!”

Kevin C.Owner of a 2009 Maz 18

“Wow does it sound amazing! I only got to plug it in for 5 minutes but I’m taking tomorrow off and I don’t think I’ll be shutting it off all day. The tone in that thing was already amazing but it is just unbelievable now! And running super quiet too! I cranked it up, it sound awesome. I turned the master all the way down, sounds awesome. Thank you so much! Amazing work and you were incredibly helpful along the way. Your guys customer service is next level.”

Luke P.Owner of a 2005 Maz 38

“Hello Don,

I’ve had a chance to play the amp for a while now and it sounds amazing. It’s really night and day and now there is actual reverb.

Thanks again for your help you guys do great work!!”

Hugo C.Owner of a 2002 Maz 38

“Hey Don, everything sounds great, I am super happy. Took it to rehearsal last night so I could finally play it at volume and it dialed in so easily. I’m sure you know this already but you all do wonderful work!”

Nick D.Owner of a 2006 Maz 38

“Got my amp back right on schedule, it’s fantastic. Very articulate, really brings out the individual characteristics of different guitars. It’s all I could ask for, thank you very much. I, and my friends who have come around to take a turn on it, are generating lots of positive buzz about the good folks at Dr. Z. My very best wishes to all of you.”

Joe O.Owner of a 2002 Maz 18

“Well my MAZ 18 chassis arrived unscathed and after popping it in my 2×10 cab it was singing like a bird – and I mean SINGING! Sounds like it has more gain as well. It also responds well to volume changes on the guitar, cleaning up nicely with reduced volume. Works well with both my Tele and 345 with minimal knob fiddling. Of course I always seem to end up playing louder practicing at home in a carpeted room, so I can’t wait to go live. Job well done!”

Jim SmailesOwner of a 2008 MAZ 18
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