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Very nice! Curious what you think of ARS caps vs F&T or other?
Ghosting actually isn’t really that big a problem with this amp. My JTM45/100 probably ghost at least as much. Grounding scheme is perfect too and...
I tend to get hung up on one amp at a time, so right now I am tinkering with this one. I made a very interesting observation today. Just for fun,...
Well, this amp is a finnicky little monster...it sounds terrific at times, and farty and saggy other times, and sometimes both at the same time....
I changed some values in the bias circuit so I could run it even hotter. Biasing "by ear" and watching for redplating, I found the amp to sound...
Interesting. I wonder if this contributes to the issues I am hearing. Even when biased high, I am having trouble getting a really clean sound...
I’m also interested to hear what voltages you get in your amp, Stu. I discovered that mine needs to be biased quite a bit hotter than usual. That...
That would be very nice to try. I don’t normally stray from stock filtering, and some of the charm to these are the low filtering and unusual...
Very nice work! I am eager to hear how you like it. I got my old clone back, and I og back and forth on loving it and hating it. These...
428 is just right for a 50w from that era. What is your heater voltage? To have the high voltage taps that high seems a little odd.
Haven’t had time yet. I’ve focused on cleaning up all the minor stuff that needed fixing. Since this wasn’t an untouched amp I decided to improve...
Thanks! Fortunately I have 3 of the correct type with '68 (or was it '69?) date codes in my stash. I replaced the bass pot yesterday very quickly...
Found this 11xxx serial number which has very similar parts, although from a dubious seller:...
No dye on the solder joints on this one, they didn’t do that around this time. But just by inspection and having poked around in numerous vintage...
And looking at the photo now, I see someone messed up the wiring of the replacement bass pot. Could definitely explain the lack of punch and gain...
[ATTACH] [ATTACH] [ATTACH] Paging the parts experts around here, especially @TAZIN . I finally got my first Plexi. I’ve owned lots of metal panel...
Curious about the power transformer. I think there were some amps at the transition point with JTM45 faceplates, but otherwise really JTM50 style...
Think of it this way; the presence control effectively removes high frequencies from the NFB loop. So less high frequencies will be cancelled...
I think pleximaster is talking about the glue used between the layers in the plywood. That would have a major effect. Glue in the corners not so...
OK, I am sooooo close now. I have managed to extend the voice coil wires nicely. There is continuity, the speakers are working....but as soon as...
