Mustard Caps in 63 Bandmaster???

[bobtec]

I am starting to get scratchy sound on Normal channel volume, either the .1uf or the .047uf are leaking,Can any of the caps cause this? if I do not change the caps,will this do harm to the amp?and can I use one of the .1uf Mustard caps that Neil gave me, as a temporary...or should I just get a few Mallory or a Sozo blues....

[johndosun]

I am a very good post. I know that many do not get to read this.

[gldtp99]

First off---- you have cleaned the pot itself, right ?
The small amount of DC, if it is a leaking cap, won't hurt anything but it is annoying----- I'd save the Mustards for a Marshall type amp and install M150's to see if they solve the problem:

https://www.tubesandmore.com/products/C-M

[gldtp99]

Have you measured any DC at the pots ? The Blue Molded caps used in some Brownface and most Blackface Fenders rarely leak DC (but any component can fail)---- If your amp has the yellow Astrons the DC leakage is more likely.
I rebuilt a Brownface 6G7A Bandmaster that had been in a flood and used mostly Mojo Dijon coupling caps on the board---- nobody who played the amp afterwards could pick out this rebuilt amp in A/B tests with other orig component 6G7A Bandmasters I have:

[MikeO]

i'm working on a '67 Bassman that had a similar issue. The Bass channel volume pot was very scratchy. It turned out to be a bad 250pf cap. It was actually a silver mica replacement. For all I know, it could've been the wrong size... my eyesight is starting to go, couldn't read it.

[bobtec]

It was the plate resistors on the Normal channel...This poor amp had everything pulled out of it and put back in 2 or 3 times...The guys at Kendricks amps ripped me off for $1,500.00 and it took over 21/2 yrs..I got it back from them ..I found the problem..All that was wrong the plate wires to the power tubes were switched and it had a corroded ground wire under a glob of solder...The Great amptech Skip Simmons fixed it for $50.00