After its been played for a few minutes the sound begins to deteriorate and certain notes got this kind of buzzy grindy sound as it fades
If not a valve issue check by preamp valve substitution 12AX7A's.Check solder joints +/- 16v circuits and send/return and input jacks.
SOURCE: when playing notes on the A string I get a crackeling noise
Just a thought:
If you used the speakers with another amp and they still make noise when you play certain frequencies, then it is obviously a problem with the speakers or the cabinet - it could be a mechanical resonance in some part of a speaker / cabinet, something like a loose screw or a nut, loose protection mesh on the speakers that resonates at certain frequencies, possibly a bad speaker or a speaker membrane...
Also, you might want to check the pickups on your guitar, see if the pickup core slug under the A string is much closer to the string than the other slugs so it is either picking up too much signal and distorting it or the string might be touching the slug when you play it and cause noise, also see if the string is touching something else when it vibrates...
good luck
3rq8 (Triarcuate)
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