Quayhog,
I've never seen one with a printed circuit board? Must be a later model. If these aren't matching designs, I wouldn't put much money into restorations yet. If you need schematics on the point to point, just ask. I've got hookup diagrams too.
Advice:
1-The rectifier tube will always flare on start up
2-The 12au7's make a huge difference. Get 4 of the same
3-Tubestore.com has 6GT5's on sale right now for only $15
4-If you can tighten the ground wire on each amp it will make a huge difference getting a proper ground.
Finally, get these professionally biased. These amps will eat output tubes if the bias isn't on. It won't hurt to bias them a little low (90 watts output). This won't soften the sound and really extends tube life.
Enjoy,
Emery

elevick April 22, 2015 17:51

I'll really try to stress that the hookup diagram is a bit crazy and necessary. Any pair of taps will get you 8.4 ohms or the insane wiring for 1.2 or 5.6. The wiring I list above was bench tested and proven to be quite amazing. Email me if you have any issues/questions. emfoods"at"yahoo.com sorry, audiogon won't allow email addresses..

elevick March 10, 2015 02:52

Hey Quayhog,
I just saw your question. I've done a bunch of upgrades. The ones that mattered the most were re-grounding the chassis and changing out the taps. Grommes shows that any pair of taps (ie 1&2) will work for 8.4 ohms. However, we found that strapping 4 & 9 and using 3 & 9 for the speaker outputs was far superior.
Also, I replaced the caps with JJ. There weren't any quality 3 leg taps, so I just used 4 leg taps and dropped off one leg. Went higher on all values.
Be careful of which models of 101 you use. There were actually 2 different layouts, one had the inputs on the top right rear, the other on the back right. I think they two are slightly different. You can also look at the Frazier version.
Finally, the TL-1A: I don't think they do anything unless you have a microphone input. I do have them in mine but think it's irrelevant.
Quality 101's sell for $500-600 each while beat up ones sell for about $125 each. Good or bad, I'd buy matching ones unless you plan a massive rebuild. I've had 2 pairs now. I prefer the rebuilt ones to NOS. Both are amazingly clean & fast. Not at all fat, warm or tubey. Email me if you need schematics or help.

elevick February 15, 2015 21:20

Bdp, did you ever rebuild your grommes amps? I just did a ton of work on mine with some astonishing results. Email me if you want some details.

elevick January 27, 2014 02:58

The first pic, Grommes is the "after" shot.
Pull up the second pic, coincident and it shows the "before" look.

elevick March 22, 2009 03:49