DC-5 Strange Sound when Turning Amp Off

My DC5 combo makes an interesting sound when it is powered down after being on for multiple hours. It only seems to happen when I am using the recording out and the speaker is muted. The sounds is like a old analog synthesizer doing a long and slow dive-bomb. My first though was a leaky power cap, so I replaced all of the electrolytics in the power supply section. Made the amp sound noticeably even more awesome, but did not solve the makes everybody in the place look around like a dog that caught a glance of a squirrel when the band starts packing up. I also swapped out all of the tubes on the off chance that they were the culprit but no change in the issue. Any thoughts?

i think this issue comes around the TL072 circuit !

Agreed, I am pretty sure the issue is in the emulated output section since it never does this when I have the silencer switch disengaged. I will try swapping out the .047u caps in case one of them has gone south on me.

i would try milar 225p sprague there


good luck