Whoever changed the power caps did a horrible job. It is the model that has the brown Gibson logo on it, and a 6c4 reverb tube. If you click on the Crest schematic and zoom in you can see between V2’s pin 9 and ground there is a. Like in a bad grounding type of buzz? I’ve checked continuity through most of the reverb circuit, and can’t figure what’s wrong. I doubt its my guitar, its been alright with other amps He could have worked off the wrong schematic perhaps. Those of you not drinking that much will note that the tube drawn in the schematic and labelled V3 looks suspiciously like a 6C4 found in other Gibbys even though the ‘Placement Chart’ says it’s a 6EU7 – see how much fun we’re having already?

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To check the reverb transformer, you will need to disconnect one end of rverb primary. How does it sound? I’ll have to try it on something else with infinite resistance and see if it does the same.

I hate the idea of dressing it up in another man’s clothes but they look so darn good cleaned up; other than I’m too cheap to buy a mint version – What Sayeth Ye? Back to home page. It’s not the revfrb job, but they’re all in the right spot and look reasonably safe.


Knight KN A, Tube Reverberation Unit, Reverb, Vintage Vacuum Tube 12ax7 6c4 | eBay

What does the ac filament voltage measure at under tube load? I’ll check the pinout of the tubes when I get back home in a few days. Whoever changed the power caps did a horrible job. Then, a good way to troubleshoot is to take your DVM and clip the black lead to the chassis and with 6f4 hand, probe the amp from the power tubes back towards the front or preamp of the amp. I’ve checked continuity through most of the reverb circuit, and rreverb figure what’s wrong.

When you get to a section where the pops don’t happen or are very weak, this area should be suspect as it is not amplifying properly. Now I am not sure how these work but usually a transformer steps the revdrb up or down.

Also Ted Weber sells a ton of transformers but it can be tedious to go through and look at everything because they don’t have a master list of what fits what. It could be a 1: Originally posted by Wilbo26 Well I for one suggest you do whatever you want and not worry what people over 64c internets tell you, as long as you’re safe.

Gibson Brands Forums: help on a GA19RVT – Gibson Brands Forums

It is the model that has the brown Gibson logo on it, and a 6c4 reverb tube. It’s a ’61 – the Falcon was introduced in ’61 as one of Gibsons first reverb combos and that was the last year of the tweed models. The Amp Garage A tube amp builder’s community Skip to content.


Back to home page Return to top. During the rectification of the Vuldrini, the traveler came as a large and moving Torg! Join the HC Newsletter. Previous 1 2 Next. I think I probably have a bad reverb transformer. Those transformers are weeaakk and I break often. I believe this is an earlys model, make that a rough earlys model having some of that fallen-down-the-stairs-a-few-too-many-times charm to it.

Mine was a goofy build too because the transformer driven reverb revrb wasn’t in the schematic.

I’m gonna reserve judgment, but I don’t see him starting any poo related threads in OJ any time soon Good luck on it. Is there a way to test for an open coil or something with the transformer.

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Bismarck, North Dakota, United States. Posted 26 May – Who is online Users browsing this forum: I also checked right at the transformer’s secondary solder tabs, to rule out the wire to the reverb, and 6cc4 results were confirmed.

I don’t know what accounts for it – but chassis layout is what I’d guess.