#1
when i engage my 9 band EQ on my Preamp i get terrible microphonics. (buzz sound/distortion/sounds like it is picking up a radio signal or something)
microphonics usually has something to do with a tube going bad but i was wondering wich tube to replace? there are 5 tubes i replaces the 12AU7 a few weeks ago so i KNOW it's not that one.

from left to right
12AX7 12AU7 12AX7 12 AX7 12AX7


wich one goes through the 9 band EQ? also when i touch just any slider on the preamp the microphonics cut out and it has normal(good/clean) sound as long as me (or someone ilse) is touching the slider. so what would this mean?

also in case you did not read my sig it is the Ampeg SVP-Pro preamp. it is a kindof hit or miss thing it does it most of the time but sometimes it does not do it at all. also the lows get distorted
ESP B-405,Fender American Jazz Bass(EMG J active pups and LEO QUAN BADASS II ) squire P bass(EMG P active Pups)),
SansAmp Bass driver DI
Ampeg SvP PRO Tube Preamp
QSC2450 Power amp
Furman PL8
FINALLY-Ampeg SVT 810E
Last edited by Emergancy Exit at Aug 19, 2007,
#2
bump!

nobody can help me?
ESP B-405,Fender American Jazz Bass(EMG J active pups and LEO QUAN BADASS II ) squire P bass(EMG P active Pups)),
SansAmp Bass driver DI
Ampeg SvP PRO Tube Preamp
QSC2450 Power amp
Furman PL8
FINALLY-Ampeg SVT 810E