Post by schlagsaite on Nov 19, 2013 5:17:55 GMT -7
Hello, i'm new here and this is my first post. I got a used Jaz combo not very long ago, which is my first Dr Z amp so far. It's a great sounding amp as you all know of course, but i needed more time to get used to the tone and volume controls than with other amps i've owned. Somehow it reminded me on my first Mesa Boogie in the 80's. I already learned how the master and volume work, thanks to this forum. I still have one question left. Which preamp tube is working as what? Ok, the V1 and V2 are the regular suspects i guess. The AT7 is the reverb driver maybe? One for the tremolo and one for the effects loop...? Enough guesswork. Does somebody has a chart of the function of the six preamp tubes? Sorry if it has been answered somewhere before, but i did a search and couldn't find anything. Thanks!!
Welcome and congrats on the JAZ. It's a great amp. As you've noted, there is a learning curve to understanding all the amp can do. That's part of the fun.
I don't have a chart of the tube functions. Since there's some overlap with the MAZ series in terms of front end design, it's probably a good guess that V1 through V5 match up with the (reverb models) MAZ 18/38. V1 and V2 are preamp, V3 and V4 are for the reverb and V5 is, iirc, the phase inverter. The MAZs with effects loops don't have an additional tube dedicated to that. My guess is the sixth preamp tube is part of the tremolo, unique to the JAZ in Dr Z's amp line.
But the phase inverter is most likely V6, last tube before the power tubes. So my guess is that V5 is there for the tremolo. The Z website shows JAZ V6 as a Sovtek 12ax7LPS, same tube as V5 in the 'verb MAZs and V3 in the NR MAZs, so I'm pretty sure this is a reasonable guess.
Anyone else with additional / better info?
I bet if you send an email to email@example.com asking what the tube layout is, you'll get a definitive answer pretty quickly.
Gear piled high. Talent? Must be hidden in there somewhere.
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