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Older Peavey TKO 115 - Scratchy speaker noise???

Switching jacks are not typically the "using a stereo jack as a switch" deal commonly seen on basses and stompboxes. There's actually a separate contact for the switching function. In this application that switch is closed (connected) when the jack is empty, open (disconnected) when there's a plug in the jack - which further demonstrates that it's not just a stereo jack.

Everything you have described so far is consistent with an intermittent connection (works fine, scratchy, no sound) at the Pwr In jack's switch. I would suggest leaving the short cord plugged in there for a while and see if the trouble stays away for a week or so of use. If you want to pull it open and try cleaning that switch contact directly, you could also do that.
 
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Hey everyone!

It's been forever since I've had access to the internet. A few days after my last post here, I screwed up my back really badly, then the next day my laptop completely died on me. So I finally replaced the laptop and am back online.

I wanted to thank everyone for their help here, everyone was just awesome with all the great help and advice. I certainly learned a lot in the process of troubleshooting (and finally fixing) the amp.

So ya....it's fixed!!!!

I was having trouble finding an amp tech that I could trust, and I had ordered new pots and jacks to replace all the old ones from Peavey. One day I responded to a Craigslist ad, someone was looking for old Peavey amps to salvage parts from. A while ago someone had given me an old CS800 that didn't work so I thought he might be interested in salvaging the parts. He ended up not wanting it because it's too heavy. Anyway, we got to talking and he obviously knows his way around the inner workings of older Peaveys. So I just asked him if I could pay him to replace the pots and jacks on the TKO. I told him I have limited soldering experience and didn't want to fry the board doing it myself. He told me when the parts arrive in the mail to let him know, and then I can bring it over to his house and he would do it, while teaching me how to do it myself in the future. Awesome guy!

So I went over there a few days ago and he showed me how simple it is to swap those parts. Not only is it fixed now, but I have the confidence to do it myself the next time a pot or jack needs replacement.

I couldn't be happier. Not only did I learn how to do the repair, the amp sounds great now! And I avoided all the horrible amp techs in this area who charge hundreds of dollars and don't do the repairs properly. So after a string of really bad luck with the amp, my back, the laptop, etc....I finally had some good luck for a change.

I really wanted to wrap this thread up with some closure. I hate when I search online for problems, and find something exactly like I am experiencing....and after reading through pages of troubleshooting I find out that there's no solution or ending to the post. Leaving everyone who reads it wondering what the problem was. I know forums like these are a great resource for researching problems and solutions. So I wanted to end the thread with the solution to all of this. Glad it was a happy ending.

So again, I want to thank each and every one of you for your help and advice.
I'll do it Steve Martin style....
thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you,thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, thank you, and thank you! I hope I didn't leave anyone out.

Have a good one guys. You rock!