i ordered a beta lead combo with footswitch from eb-y. well it only worked on one channel and no reverb. i put all new i.c. sockets in and ordered all new i.c's.
here is where my troubles began. i accidentally ordered a (ECG)4056B cmos chip instead of the correct(ECG) 4506B chip and it caused me many hours of time troubleshooting it. i put the orignal 14056B chip in my new socket and the preamp worked again, so i adjusted r18 for 1 millivolt and now the beta is rocking again.
note: if your pots are really dirty,try this: get some type of syringe and use coleman lantern fuel-squirt it in the pot and turn the pot back and forth.repeat this 3-4 times then blow it out with air. my beta lead pots are perfectly quiet since using the coleman fuel-it won't harm the plastic like most contact cleaners do. i hope this helps somebody in the future.-jack
