Slats

Myles, success! I went down the line of the preamp tubes gently wiggling them. When I got to the last one it made the popping sound and changed the hiss. I pulled the tube out then put it back in, and all the noise went away. It's very quiet now on all chanells and at any volume. Thank you once again! Frank

Myles, I'm wondering if you can help me troubleshoot an AC 30 that has developed some noise. It's got a loud static sound with intermittent popping. The only control knob that has an effect on the hiss is the cut knob. Taking the guitar cord out, or putting in in any input has no effect. I'd like to isolate the problem. I was thinking of gently tapping on the tubes while the amp is on to see if it makes a difference. Can I safely swap out tubes while the amp is on? Any help and advice is much appreciated! Thanks again Frank

Myles, I'm not sure what you mean by the #4 and the #8. Thanks

The combination makes for an interesting complex sound that is rich and musical, and has almost an adicting sound the way it draws you in. I'll leave the Telefunkens and the GE 12AX7's in and maybe trade the others, I've got about 15 or so of the GE 12AX7's Would trying to get some old stock RCA, GE or some other EL 84's be the next logical step? Thanks Frank

Thanks for the response Myles. Most of the 12AX7's are GE with mfg. dates of '63 and '64. One is a Sylvania with a 1955 date. My father-in-law is a retired Air Force Pilot and would get first crack at the military surplus tubes. I've put a Telefunken ECC82 in the phase inverter spot, a Telefunken ECC83 in the V1 position, and now the GE 12AX7's in the other pre-amp positions. I've got a matched set of JJ EL84's from Bob at Eurotubes in the power section. Maybe I can find someone to trade the GE 12AX7's for some EL84's to try for a more original VOX sound. I'm wondering if you have any thoughts or suggestions on the tube set-up I've just described. Thanks again Frank

Hey Myles, I'm wondering about the tonal characteristics of a 12AX7WA compared to the 12AX7. I came across some in my father-in-laws tube stash, and I'm thinking of trying them in my AC30. Any thoughts would be much appreciated