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In Reply to: RE: <strong>REVIEW: Dynaco ST-70 KIT Dynaco ST-70 KIT Amplifier (Tube)</strong> posted by hubbard3@comcast.net on June 28, 2008 at 04:22:02
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.
Follow Ups:
I am fascinated by that ST-120. I gather you are happy with the performance. What speakers have you tried it with? I'm wondering how it would work with the insensitive Joseph RM33's.
I'm thrilled with the performance. I'm using EI KT-90's and Gold Lion KT88's. I really like the Weber WZ68 rectifier with this amp. It really adds to the power and I like it better than a tube rectifier, including the Mullard GZ34. The transformers Bob had made for this amp are really special. I'm using the ST-120 on Quad 988's where it seems to have plenty of power to spare, even in triode mode. This is a quiet amp. With my ear next to the speakers, I hear nothing, no hum at all.
I'm thinking about trying the Weber rectifier in a Bell 2420 to replace the 6CA4.
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