Marshall Amp Forum - View Single Post - 1997 Marshall Vs100 lights works, tubes not lighting up.

Wilder Amplification · 11-06-2009, 09:27 PM

Quote:

Originally Posted by surface54

1997 Marshall Vs100 valvestate lights works, tubes not lighting up.
My friend accidentally swapped the preamp tube while the amp was on.
The tubes no longer light up and there is no sound from the amp, well maybe 1% with the volume dimed @ 100 watts. since he has the same amp i was able to use board swapping to isolate the problem area, its defiantly the preamp pc board with the tube on it. the rest works fine, transformer, power section, and effects board. he said it was fine if i took parts off his to fix it, but i dont really want to solder anything on my broken board cause any little mishap and the problem could be unfixable. i looked on the underneath of the board and there are no burn marks or any areas that would point me to the problem area on the board. when it happened there was no smoke or sound, it just stopped lighting up tubes. anyone have a similar problem or know what would power the tube?
i dont wanna pay for a tech cause i bought the amp for $239 used 2 years ago and any more money into this amp wouldn't be worth it, even though i love the sound of this thing. i would be fine just using this pc board in mine, he said that was fine but something weird has happened, the sound is a little different, there is less high end detail than my old one, but not much. his is a 2000 and mine is 1997. mine sounded smoother, his sounds boxier and fuller. but i prefer my old sound, but i can deal with it cause i dont have the money to pay for it to be fixed.
just wish i had a magic wand to tell me where the problem part is :T
i dont have the correct tools to test it, only a multimeter, and yes the big capacitors dont drain fast, my hand found that out twice.

thanks for any help, its really appreciated.

Did you check the fuse in the heater supply? It would be on the board...should be a 250mA fuse.