I'm using 2 of the good doctor's amp heads. I have a recent 6545, which is the channel switcher. Very cool amp, but a bit finicky. It doesn't like to sit on top of a cab (makes things go a little haywire/microphonic). This makes it hard to play on stage - I now sit it on its road case next to the cab...seems to work. Aside from that complaint, the amp is killer and sounds great.
I also have an older, 1993 SRZ-65RH, which is a big-box head with reverb. Made back when doc was building these alone in his house. In 1994, Joe Walsh took one of these out for the Hell Freezes Over tour, and the rest is history. This amp is a monster! I just wrestled our producer into giving it back to me - he had it in his recording studio and did not want to let it go. Killer clean tone and sweet, understated reverb. Crank the gain, and you have a nasty hot rock machine. The absolute key to this amp is to get a cool NOS 12AX7 in V1. Recommend Brimar or RFT. Both have done wonders for my amps!
The amp is a monster. It's like a JTM 45 on steroids but with a unique voice of it's own. All doc's amps are quite original and have their own thing going on.
EF86 front, bexandall tone controls, no master volume, no negative feedback and ultra-linear output stage all make for a very unique amp. Eats pedals for breakfast and is LOUD (through my VHT 4x12).
All his amps are built to last a lifetime, the workmanship is top-notch and all components are very high quality. Sound IS personal and subjective, Dr. Z amps may not be everyone's cup-o-tea but there is no question that these are one of the best amps on the market.
I have had a Maz Jr 2x10 for about 8 years now. One of my favourite amps for sure. I also have a Prescription head and have owned a Rt 66 and Carmen Ghia as well. They are all good sounding amps but the Maz Jr just works best for me volume and tone wise.
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