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In Reply to: Re: I'm not surprised you're confused.... posted by Ed Sommer on June 08, 2001 at 10:32:28:
We are all welcome to our opinions...and I would fight for the right of someone else to disagree with mine!In this context, we were, I believe, talking about providing a DC supply to valve filaments....and if they are happy with AC, (and some people seem to prefer an AC supply), then the choice of diode in forming a DC supply would appear to be of academic value.
We all are aware that solid-state rectifiers are noisy; generally much more so that thermionic rectifiers; but I believe our filaments and heaters to be unaware of this.
Follow Ups:
Regular diodes MIGHT be OK. I have not tried it, diodes for fil. rec.
Time will tell.
I think we were getting crossed up. I agree fully that smiconductor rectifiers feed all sorts of hash into subsequent circuitry. Being a thermionics man, I have not researched those (semiconductor) diodes which will be cleaner than the run-of-the-mill varieties. Others will have far superior knowledge than I regarding this.I have had problems recently when a poster claimed that one could hear the difference between different thermionic rectifiers, some sounding "sweeter", and etc., etc. I cannot and will not believe it....and I have lashed different valve rectifiers to one of my GEC 30-watt ultralinears to test this theory. No-one could detect the faintest difference between them...and I am not surprised.
For filaments, (or, in my case heaters), I use LM338K variable regulators, configured for a slow-start. My GEC Gold Lion KT88s surely appreciate that, and I have no hum. I must confess I had precious little hum before I used the regulators, but I particularly wanted the slow-start.
Sorry this was so long.
Thanks for sharing that info on tube rectifiers, I am a solid state man. Its good to hear that all tube rectifiers sound the same.
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