Audio Research SP3-a1

Don't send your SP3 to ARC! They are just preying on your gullibility! What do you think is wrong with it: distortion in one channel, higher noise level, persistent hum, lack of gain ... ? Most of these problems are simply due to tube aging. Tubes do not last forever! Try to find a competent technician in your area! You can also try contacting Audio Classics in Vestal, NY. I have dealt with them before and have been satisfied with their service! Also check the back page classified ads in Vintage Guitar magazine for contact info on "tube amp repair" services! This might be your best bet for service at an affordable cost.

 That does seem excessive. It has only cost a few hundred dollars both times I sent pieces to ARC. I agree, would put it in the closet. For that kind of money you can get a much better preamp.  The LS2 and LS2 mk2 would not be on my list. I had a LS2B mk2 for a few years in the late 1990's. It was good in it's day but never great.

@lostbears I heard its greatness. Probably your partnering equipment causing the shortcoming.

Thanks for everybody's feedback, I really love my old SP !

ARC began to worship larger wallets. Your's no good for them. It's OK to send them to go F themselves I guess. Has anyone done that yet?