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Original Message

RE: Dynaco ST-35

Posted by Jim McShane on March 13, 2012 at 05:33:41:

Yes!! There are some very specific recommendations I have.

The ST-35 runs the output tubes over the dissipation spec for EL-84s, so I recommend the 6P14P-EB/7189 Russian tubes. Excellent tone, incredible durability - and about $55/quad is all.

For the 7247 the JJ 12DW7 is fine. It's one of the few JJ tubes I stock, they're pretty much problem free once they get past my screening, and have a nice tonal balance in combination with the Russian power tubes.

One thing - with the work you are doing BE SURE to replace the cathode bypass cap, C8D on the factory schematic. I recommend you use a good discrete cap, not a section of the quad can. Of course if you do use the Dave Gillespie boards I'm sure that's handled.

Drop me a note if you need more info.