amp lost volume

[daz]

I'm going to yank the chassis and have a look, but before i do i wanted to see if anyone could tell me what the likeliest causes of this could be. The amp has been sounding so good recently i haven't touched it. The chassis went back in it;s can a couple weeks ago and i've just been enjoying playing it. Then today i plug in and the volume is way down. Before, like any tube amp i have had, it got loud quickly and theres a point at maybe 8:00 where the volume jumps from very low to much louder then gets to stage volume by about 10:00. Today i plugged in and that jump point around 8:00 was no longer there and to get as loud as it usually is at that jump point I have to turn it to 1 or 2:00, and the amp doesn't get near as loud overall. And i swapped EVERY tube in the preamp and the 6V6 power tubes and checked the bias both with the 6V6 that were there and the ones i swapped in and all is normal and no replating etc. Before i go crazy looking for the cause, can anyone point me to the most likely cause of this? thanks.

[Enzo]

It would surely help to have some idea what amp you might be talking about. 6V6 doesn;t narrow it down much.

No need to go crazy, just approach it systematically to isolate the problem. Is ther an FX loop? APply a signal and trace it through the amp, where does it drop? Are ALL the heaters glowing inside the small tubes? I don't even get out a schematic before I check pins 1 and 6 of all dual triodes for B+, and pins 3 and 8 for some reasonable cathode voltage.

[daz]

Nevermind.....it was user error ! Your post did help me tho because I realized what it was tho when u mentioned effects loop. It doesn't have one but that got me thinking and it caused me to remember that i had turned down a pot on the back last nite i use to lower the volume a tad and is relay/footswitch activated. I use it as a volume boost. But i just remembered i used it in conjunction with the master to help eliminate that volume jump point on the master last nite ! LOL....yes, i AM indeed an total idiot bordering on sub moronic. Well, thankfully i won't have yet another troubleshooting fiasco, so thanks for jogging my memory.