Old audiophile with first tube amp. Recent factory build ST70 by a VTA competitor (sorry, got it on auction at a decent price.)
So far so good. Love the sound, and the ability to fiddle with it (and some electronic fiddling experience). I am in the middle of restoring a pair of Altec VOTT A5Xs with the intent to drive them with the ST70.
I have read almost this entire forum, and am soaking up all the knowledge I can muster, and am thankful to Bob and all else who share. I will attempt to return the favor as opportunity arises.
My concern is, somewhere along the line I read a post from someone who was not a Dynaco fan, who complained that he had no time for an amp with drivers that could be blown up at any moment by the failure of the single phase inverting diode!
Yikes! That is a pretty sobering thought. Since I have yet to perform the famed yellow sheet diode mod, I can only find one diode in my amp and that is on the power supply capacitor board.
Any idea if this is the diode he refers to, and is it that critical? If so, is there a more robust diode besides a 1N4007 called for here? Or perhaps wiring two in series as insurance?
I have parts on order to install a CL-80 and the yellow sheet rectifier diodes mod, and a GFI that interrupts on power fails with manual reset. Any other mods suggested? By the way, I am going with the more robust DGP30-E3/54 diodes instead of 1N4007 unless there is some reason I shouldn’t.
Thanks in advance for any advice.