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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Dynaco ST-70 complete rebuild - Help! posted by Sckott on June 21, 2001 at 09:41:05:
Been there, done that. Be ready to drop some bucks, the trannies are fairly expensive. Triode Electronics sells really nice replacement power and output trannies new for about $420 for the three, if memory serves correct. You might be able to find some on ebay, but you're never really sure of the condition, so that's a gamble. The SDS labs board that Triode sells is much better than the old multi-section cap that originally came with the amp, besides I don't think the old multi-section caps are available anymore. The Triode driver board benefits greatly with quality Nos tubes, the Russians sound harsh. I used GEC Z-729s (EF86 variant), and a black plate 12BH7A on the board, JJ E34Ls for power tubes, and a Mullard 5AR4 rectifier. Changing the driver tubes on the board does require messing with three pairs of resistors to get the voltages within range (it's in the instructions). Auricaps on the board really helped as well. Finish it up with a good diode, new bias pots, good tube sockets, gold/teflon RCA jacks, gold binding posts, and solid silver wire with teflon tubing insulation. I also replaced the power take off sockets with nylon pieces that mounted test jacks, to set the bias. Give it at least 50 hours before any critical listening, at first it will sound quite harsh. Full break in takes about 100 hours. If you go to all this trouble and expense you will have a very nice amp.Have fun,
twystd
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Follow Ups
- Re: Dynaco ST-70 complete rebuild - Help! - twystd 12:53:09 06/21/01 (2)
- Re: Dynaco ST-70 complete rebuild - Help! - Sckott 13:26:31 06/21/01 (1)
- Re: Dynaco ST-70 complete rebuild - Help! - pkeller 05:44:41 06/22/01 (0)
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