I have a 70 Deluxe Reverb that I haven't played in a few months & decided to bring it to rehearsal yesterday. I did okay for a hour or so, & then started making a few noises. I switched to another amp for the rest of the rehearsal, but checked the Deluxe later on. The reverb channel of the amp sounds good until about 5, & then starts making a ratty, busted speaker sound as the volume is increased to 9, but then, the nastiness decreases a bit at 10. The normal channel does not sound as bad as the reverb channel. Tried plugging into another speaker & the nasty sound is still there. Tried all different preamp tubes, & the nasty sound is there, too. I tightened the power tube sockets, & it made no difference. I made a recording, but the nastiness is not as noticable as in person, but you'll hear it. I start off playing with the volume at 4, then increase it a bit during the recording until reaching full volume. Bass & treble on 4. http://www.sbkustoms.com/music/amps/70 deluxe reverb.mp3 The power supply caps were changed before I got the amp, but the rest of the caps look to be original.