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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Which 5AR4 for an EICO ST-40 posted by GRH on September 5, 2015 at 18:22:24:
The latest efforts by New Sensor are supposed to be just fine.
I would put an inexpensive Sovtek 5AR4 in, after implementing the series SS diode tweak. The tweak is KNOWN to suppress the "fireworks" that afflict otherwise satisfactory current production 5AR4s. Even a crappy JJ 5AR4 was salvaged.
While the vacuum rectifier will block SS diode switching noise, I suggest using UF4007s instead of 1N4007s. My working hypothesis is that less noise, from the very outset, has to be better.
BTW, a claim has been made for the series diode tweak that, some of the time, a small amount of extra service life can be squeezed out of well used OS 5AR4s. I can't comment on the accuracy of the claim.
Eli D.
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Follow Ups
- RE: Which 5AR4 for an EICO ST-40 - Eli Duttman 20:29:55 09/05/15 (6)
- RE: Which 5AR4 for an EICO ST-40 - Jim McShane 13:45:22 09/07/15 (0)
- Thanks Eli, follow-up ? - GRH 05:58:27 09/06/15 (1)
- RE: Thanks Eli, follow-up ? - Eli Duttman 08:43:59 09/06/15 (0)
- RE: Which 5AR4 for an EICO ST-40 - geoff 03:12:45 09/06/15 (2)
- Sketch not by me. - Eli Duttman 08:29:36 09/06/15 (0)
- Indeed! (Nt.) - Winston Smith 03:17:38 09/06/15 (0)
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