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In Reply to: RE: yes, yes, and yes... posted by Lee of Omaha on June 17, 2016 at 14:46:18
Hi!
I read your response and correct me if I am wrong(which I usually am). I was under the assumption that a dual power supply had multiple transformers. Not a single one.
Follow Ups:
with two separate secondary outputs. I used two separate rectifiers and regulators while using one supply for positive and the other for the negative while tying the unused other halfs to ground. worked good for me and sounds way better than with a normal type of PS. This of course was for a SS preamp.I know this may not be possible but I have read that using multiple rectifiers and regulators for each stage improves the sound dramatically when using multiple stages. I never got the chance to try this but I may try this soon.
Edits: 06/19/16
You can use separate transformers or not. If you use one transformer, you use two sets of rectifiers and filters. Typically, if you "dual" a tubed amp, you change to solid state rectification because there's no room for a second rectifier tube.
Lee
Tube rectifiers are lossy and with today's very fine Schottky diodes which are ultra quiet,I no longer see diodes at a disadvantage.Now they have high voltage Schottkys where they never had them in years past in the 1.2kv range.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
The one argument for vacuum rectifiers is that they provide a delayed application of B+ to the other tubes. Since many vacuum rectifiers are directly heated, there just isn't much of a difference, as directly heated rectifiers start to conduct well after just a second or two, compared with 10-20 seconds for indirectly heated tubes. And solid state rectifiers usually don't fail.
I wasn't arguing in favor of tubed rectification, just pointing out that there's usually not room for a second one, so conversion to solid state rectification is usually necessary when converting to dual power supplies.
It's a Harman Kardon with a voltage doubler. Nearly all their amps and receivers used this topology.
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Buy Chinese. Bury freedom.
We were just talking about rectifier tubes in general..
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Otherwise it is just a change in a filter.
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