I have a old Dynaco ST-70, what to do. Put new caps and tubes, maybe a new board. Should you leave it stock and up-grade parts or modify it. If so what kind of modification?
If you do nothing else get rid of the selineum rectifier. Replace it with a diode. These things blow up and take other stuff with them and when(not if) they blow they emitt a toxic cloud into your room!
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