Odd problem after rewiring tube sockets

[shepdog]

I bought a Peavey Deuce VT recently that had a bad tube socket so I replaced it. In doing so I had to remove the tube sockets PCB and hand wire the sockets up. Before I did anything, I tested the amp with two power tubes in, instead of the four, and it sounded fine with no issues. Now that I've got everything wired up, there is this loud kind of shrill pop whenever I hit certain notes or strum harder. Ive plugged directly into the power amp input and the issue is still present, so Ive ruled out any issues with the preamp. When plugging into the front of the amp, this problem is made worse by turning up the treble. When I bought the amp, the owner had said that it hadnt been plugged in for a couple years and it is from the late 70s. Maybe it could be a bad cap thats only started to manifested itself after having been on for a bit?

[passfan]

Did the amp play alright before minus the bad tube socket or are you resurrecting it ?

[shepdog]

The amp played fine prior to the rewiring. I managed to track the problem back to the negative feedback circuit. Ive just unplugged the negative feedback lead coming off the speaker jacks. I assume its a bad electrolytic cap so Im going to leave it unplugged until I get some new caps ordered. I cant even tell a difference not having the NFB.

[passfan]

The amp played fine prior to the rewiring. I managed to track the problem back to the negative feedback circuit. Ive just unplugged the negative feedback lead coming off the speaker jacks. I assume its a bad electrolytic cap so Im going to leave it unplugged until I get some new caps ordered. I cant even tell a difference not having the NFB.

If it's treble induced as you say cutting out the nfb would cut down on the problem as I believe , depending on any presence pot arrangement, that the highs are amplified in the feedback arrangement. In short, you may have just masked the problem. Usually when you do a lot of work in an amp that worked fine beforehand and shows problems after, you're looking at a bad solder connection or a tube problem, especially with large intermittent transient pops. Good luck.