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RE: (strong)REVIEW: Dynaco ST-70 KIT Dynaco ST-70 KIT Amplifier (Tube)(/strong)

Posted by rgurney on June 29, 2008 at 09:40:22:
I have to agree with Mr. Hubbards comments.
I've built both Bob Latino's ST-70 and his new ST-120. They are the most fun electronic kits I've ever built. His directions are detailed and well thought out.
I also am using the Russian PIO .22 UFD coupling caps in both amps. Bob can provide a matched set for each amp. I must make a warning in using these caps. They have a bare metal case and bare metal leads - and the leads are quite short. Be extremely careful when mounting them on the VTA board. You must avoid having either the case or the leads touch anything nearby. In building my ST-70, one of my output tubes had runaway bias and couldn't be biased until I discovered one of the leads for the PIO on that tube was just touching one of the nearby 12AT7 socket PCB pins protruding through the back of the board. I trimmed down those pins and applied teflon PTFE tubing to the leads to ensure isolation. That solved the problem.
I can't recommend these kits strongly enough.