![]() ![]() But i would maybe change R14 and R12 to the old values and listen what happens. The new RI version is better than the old one regarding PWR Supply, noise etc. > C3: Was not identified on the guts pictures. > R12: increased from 10k to 22k in the new RI Edition. ![]() Was this unit moded for lower gain tubes? "Tube Driver" can you please measure the bias voltage in both R7 and R8? > R7,R8: From the pictures the plate resistors look like 6,8k. Maybe 2,2k works better when one rolls off both the Bass and High a la Eric Johnson? Several people reported that the tone stack reacted different on the new version vs. > R14: On the new RI version it increased from 2,2k to 22k. The most significant differences compared to the new RI edition are: I'm not sure what to do with this fella, but I have a feeling it will stay in the shop as a guitar demo unit (I do like the cleans mixed with the spring reverb) until someone needs a beat-up rawk machine.As promised here is the schematic of the early tube driver traced from the guts posted on this thread. ![]() It seems that the tolex-covered (rather than felt-covered) versions of these are a little rarer and they sure look a lot better. The upper (non-padded) jack also does not hold plugs all that well compared to the lower. The jacks are all those panel-style ones with the irritating plastic threads, too, so you have to be careful about not over-tightening them. It's now ready to roll, though it does show plenty of wear-and-tear to the tolex covering and metal hardware. My own work on it included fixing things that'd been fudged before: it needed a new 3-prong cord installed as someone had clipped the ground prong, all the pots needed spraying-out and the jacks needed tightening, the two preamp tubes needed replacing (I just stuck some spare Chinese 12AX7 ones in there but would put lower-gain tubes in if I were planning to get a more bluesy tone), it needed a serious amount of cleaning-up, the fiber-board holder for the speaker connector tabs needed to be fixed back onto the speaker's frame, and the speaker cable needed replacing as it'd been hacked-up. ![]()
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