Hello All,
I am the original owner of a 1966 Spectrum I. It is in like new condition, but I would love to get a hold of the schematics and/or service manual if they exist. I recently replaced the EL34 power tubes (the originals were breaking up, probably just due to age) and am wondering if the amp needs to re-biased? There seems to be a fair amount of hum when powered on that I used to be able to generally kill by flipping the polarity switch. Any information would be helpful.
