Carvin Legacy 100 repaired except amp buzz

[Chessiv]

I ordered new caps for the power section. We'll see if that takes care of it.

[g1]

You mentioned in the video that it was C33 and C37 (edit: R33 and R37) in the reverb circuit that blew. Do they match up with the cathode resistors for V4 shown on the Rev.F schematic?
Was it V4 that was the bad tube you replaced?

[Chessiv]

It was r33 and r37 that blew. If I said the caps that was a mistake. I checked the caps and they appear to be fine. I did replace all the tubes actually.

[Delta362]

I have seen issues on those resistors (as well as the plate resistors) if they substituted a 12AT7 in the reverb slot instead of the designed 12AX7.

[g1]

It was r33 and r37 that blew. If I said the caps that was a mistake.

No, you said 'R' in the video. Sorry, my mistake.

It's difficult with 'iffy' results from the send/return tests. How about if you put a short across a plug in the return jack? Any hum/buzz?

[Chessiv]

Update - I replaced the caps in the power section, no change. I ran clips from ground to different areas of the amp thinking it’s a ground issue, no change. I did short the return jack and the hum was very quiet but still there. I’m guessing it’s an acceptable level since it’s going to the power section.

so it looks like it’s somewhere in the preamp section? Since the failure was in the reverb section is there a way I can bypass it safely?

[Chessiv]

More progress

I started testing every component. Found R78 & R79 on the power tube section not dead but burnt and way out of spec. Along the same lines, R27 & R28 were slightly out of spec and showing signs of failure. Replaced all four and much of the noise is gone. The clean channel is really clean and appears to be fully working. The distorted channel still has a buzz that increases when the drive is increased. Looking through all of those circuits next.

[Chessiv]

To wrap it up. The amp is working great now. In addition to the resistors above I found 3 caps that had funny readings in the tube heater section. I also replaced those. Put it back together and it sounds great.

Thanks to everyone for the help.