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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: Current production GZ34 posted by Todd Slaughter on December 16, 2012 at 12:40:14:
Todd,
The unpleasant reality is that no current production 5AR4/GZ34 is 100% satisfactory. All of JJ's Octal production is trash. Chinese tubes have no problems running at the max. rated voltage, but they get into trouble when the rated 250 mA. is drawn. OTOH, Russian (Sovtek) tubes are fine with a 250 mA. draw, but get into trouble when required to run at the max. rated voltage. :> (
IMO, the best answer to the conundrum is to wire the rectifier socket as shown in the uploaded graphic. Use UF4007 SS diodes, as they are MUCH quieter than 1N4007s shown. The "sand" diodes provide some PIV headroom for the otherwise acceptable Sovtek rectifier. The tweak can help aging old stock tubes to last a bit longer, as well. The sonic signature is (thankfully) dominated by the vacuum rectifier. The Russian rectifier has a reputation for sounding good.
Eli D.
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Follow Ups
- RE: Current production GZ34 - Eli Duttman 12/16/1215:28:07 12/16/12 (6)
- RE: Current production GZ34 - Todd Slaughter 03:46:40 12/17/12 (5)
- RE: Current production GZ34 - Todd Slaughter 09:44:36 12/17/12 (4)
- RE: Current production GZ34 - Eli Duttman 18:08:05 12/18/12 (3)
- RE: Current production GZ34 - Todd Slaughter 06:09:41 12/19/12 (2)
- RE: Current production GZ34 - Todd Slaughter 01:51:52 12/23/12 (1)
- RE: Current production GZ34 - Todd Slaughter 11:29:56 12/26/12 (0)
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