Seems ANY channels that had the compression ON - are now a complete waste ( 100% garble and muck sounds )....even the preset 12 which was suppose to be Compressed Clean. If I take and shut the compression off - - it cleans right up . . . amazingly too....
There (seems to me ) to be a lot of humm now.....
To appease, I'll go to a clean channel and keep the tone and eq at 0 ( flat ) - no chorus, no effects loop, no noise reduction, no wah, no compression - Voice 1 Crystal Clean, drive 15, master 79....nothing plugged into the unit ( no guitar cord) just one cable to my ADA microtube 200 and a single 30W celestion . . . audiable hummmmmm
Plug in my guitar ( Les Paul Shred stock pickups ) - and it's nice, clean and loud...but...hummming...
Change to voice 2 Spanky Clean - - same thing, with a bit, less hummm, but still there...
Voice 3 Fat Clean - nice - ....with hummmmmm
Voice 4 Vintage Brown and 5 - I hear no humm a lot less volume though...a lot . .
Voice 6 hummm is faint...
Voice 7 brings in the OD - I played with it . . even at 0 and the drive at 0 ( Master at 79 ) - it's garbage....worse sound ever...
8 - same . . .not even playing any notes, nothing plunged into the input, the green light stays lite on the Graphic EQ and Chorus . . . hummmmmmm
I can probaly re-work all my patches and live with this - I'll have to use the Noise Reduction for sure.....
but by no means can I turn on the Compression anymore....it just is a loud obnoxious bunch of garbled feedback...ughhh
So - having been schooled a bit by M_JMP - the first thing I did was measure the test point - 193.9 vdc ( a hair high...)
then I started to check my caps since I did the noise mod in March. .. I swapped out a few, but no real difference....
I am going to probably try some new tubes just to rule that out....it would surprise me ( though I haven't a lot of experience) if the new caps I installed a few months ago were to already be shot....
VCC1 = 5.09vdc
VCC2 = 15.24vdc
VCC3 = -15.49vdc
uh-oh.....suppose to 24vdc at pin three of U 906 (LM317T) . . .I measure 38.2vdc
U 901 (LM337T) @ pin three is suppose to be -24vdc I measure -38vdc
Filliment U 904 should be 12vdc - I get 11.8
sooooo - something is messing up the 24 vdc . . . feedback ( no pun intended ) . . . .