Good morning and such.  It was by chance that I found this forum, and maybe, hopefully, find some answers too.  I have an 1974 (maybe) Randall RG 90a-115 amp that is mainly a mystery to me.  I can barely find any info about it except for a few other lonely fans that have similar Randall's from that era, which have sustained my hope all these years.

I just recently replaced the 15" speaker with a brand new Eminence (thanks TDPRI, I should get back there and give them an update and thank you), but in doing so, i found that the amp has other problems as well.  The left (1st channel?) sounds dull and muffled, like a wet towel is in front of the speaker.  Ive also noticed that the bass and treble pots on that side don't seem to work as well.  The right (2nd channel?) works, but after the first 2-3 minutes starts the loud popping and snapping, and only seem to stop after I turn both the bass knob off and volume knob down to about 3.  Tremolo works, which my 12 year old son gets a kick out of, and reverb input doesn't, which i'm ok with...I probably need a new RC plug for that side.

If I can get just 1 side working (tremolo side preferably), I would be a reasonably happy man.

Soooo...anyone out there willing to help?