I have a love/ hate relationship with early 90’s to early 2000’s audio equipment.

This is an Adcom GTP-350, which a decent mid-range stereo pre-amp from 1993. I bought it off of Ebay for $80 and free shipping. It came to me with no left channel and scratchy to non-working pots. So several applications of Deoxit and working the pots they all came back to life. However, the left channel would just now work, EXCEPT for the radio. The radio played normally through both channels. That told me this unit has fallen to the curse of dry/cold solder joints. So I took about 30 minutes and resoldered all the joints in the signal path of both channels.

Then… I ran into my own stupidity… Sometimes I’m just and idiot and using an extremely flawed testing method and a defective external part (USB-C to 1/8" Stereo adapter) I thought I hadn’t fixed it. After messing around with it for another 30 minutes, I discovered my mistake… Then discovered the adapter I was using to play music from my phone was defected (if you guess it would not play through the left channel, even on known good equipment you get a cookie.) So I figured all that out finally, as I said, I’m an idiot sometimes, and it’s working great.

The plan is to run it for a week or so and make sure nothing else happens. I am contemplating recapping it, but we’ll see. If it passes, then it will go up to my living room so I can get my main stereo back to working. Right now I’m running a Marantz receiver I fixed and while I really like it, I like my main stereo even more.

Here is a photo of the work I did today. I started at the inputs (top center of the photo) and just worked my way down. To the left in the photo is the radio section and it’s working fine, so I didn’t touch it. Also, we don’t listen to the radio, so if something does happen to that section I’ll just isolate it from the signal path and just leave it.