Hey all. New member here. Been lurking for the past couple of days trying to figure out what might be wrong with my amp. Thought I'd cut to the chase and just ask you guys. I have an Ampeg B-80N. It's an obscure 80 watt solid state combo amp from the late 70s with a 15-inch speaker. Google it and you'll see how little is out there about this amp. I've had it for almost 20 years. Picked it up used for $200 back in the day and it worked fine for the first 5+ years of its life. Anyway, here's the deal. The amp now has a lot of distortion at any volume. It growls no matter the settings and the volume. It started doing this a long while back - right around the time the kids came along and I didn't have much time to play. I put the amp away and basically forgot about it. I used to play a G&L bass with active electronics through it, and now I'm playing a passive Hofner Beatle Bass. I've experienced the growling with both basses. At first I figured the speaker must be shot, but I tested it yesterday and discovered that the distortion is also prevalent when using the headphone jack. I also followed some advice on here and pushed on the cone with my hand and heard nothing, which I understand is a good sign. There's no tears in the speaker, and it appears fine to the naked eye. Today I cleaned the input jacks with de-oxidizer [and the pots] hoping that might take care of the problem, but no dice. I removed the speaker and the head today and took a look inside. Don't really know what I'm doing, but didn't see anything that looked alarmingly wrong. I did notice some pigtail wiring for some of the back-of-the-box inputs that seem to be connected with electrical tape. Not sure if that's kosher or not. So, anyone have a guess as to what it might be the problem here - and, as important, how much it might cost to fix? Reading through various threads here I saw a lot about low bias causing distortion, but it seems like that might be more of an issue for tube amps. Thoughts? I've tried to put in as much detail as I could think of, but hit me with any questions you might have. Thanks in advance.