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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: He's wrong. posted by Al Sekela on January 2, 2007 at 14:45:51:
It would have been nice if Bare had actually explained wtf he was talking about. I guess its one of the double super secret probation things, and he'd have to kill us if he told us. Ignoring the implicit threat, I'll opine that he was (non)suggesting that one could put a single extra bespoke diode on the b+ output of the rectifier bridge, and the result would be an extra diode drop as well as imparting the turnoff characteristic of that added rectifier to the whole bridge. Dunno if it would actually work, but this has been discussed over in the TubeDiy Asylum.As to the need for heatsinking the hexfreds, in this specific application, I don't see the need for it. According to AES, the PH1 consumes 20watts. Conservatively assuming 4 watts for the heaters, one is left with about 16watts consumption. At a conservative B+ voltage, lets guess 100ma through the bridge. If there is a point of failure, its going to be the turn on, when the discharged caps represent a load of close to their ESR. The propensity to blow at turn on is going to depend on exactly where in the AC cycle you turn the PH1. One could model this in PSUD and check the first cycle parameters against the rectifier's 'nonrepettitive peak surge current'from the spec sheet. Regardless, added heatsinking isn't going to help in dealing with the non intermittant turn on current pulse, it will either fail at that point, or not.
FWIW,
Paul
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- But aren't we all? ...at times - pmkap 13:05:00 01/05/07 (0)
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