My Fender Supersonic is making a high pitch feedback after a 2 hr. loud jam session (well... 3 on the volume)
I think it's the power tubes? But like I said, if I were to turn it on now it would be fine, but after a band practice with drums and all the gain channel would start a high pitched feedback noise which you can clearly hear when not playing.
I had a quick peek at the tubes, they're both glowing the same and doesn't seem discolored or anything.
Cool, I think it's probably a pre-amp tube as the power amp tubes were replaced very recently. But I'll check all of them.
I tried pulling one of the pre-amp tubes out to see whats in it but after removing the metal casing it seemed a bit tight to just pull out, I just wanna make sure if that's the procedure? Just remove the metal case and then pull it out? I was afraid of breaking something when pulling so hard.
So I tapped all of them a bit with moderate volume on the amp. Nothing.. There's obviously a small "pinch" type sound in the speaker at the moment of impact on the tubes but no feedback like I get after playing a while. Most of the back tubes do however give a seconds feedback noise that quickly goes away when striking, but I doubt it's that.
Its weird that its impossible to simulate this at any time. The super sonic has 2 rows of pre amp tubes, I think 4 in the front and 4 on the back, or something like that.
