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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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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: Re: Tube Diode Buffer? posted by fatbottle on December 14, 2005 at 08:13:36:
I originally wanted to use a Graetz bridge, to get hash-free operation, but I found that too many volts were lost that way.Now I use an SS bridge, in series with two paralleled 6D22S TV damper thermionic diodesand it works well, giving me a drop of only 8 volts. The 6D22S diodes are in the negative line, to avoid a dangerous voltage at the top cap.
I don't believe thermionic diodes used in this way reduce hash from the SS diodes but my MUR4100E diode bridge doesn't seem to be noisy anyway. After the SS bridge, I have a 0.1uF cap in parallel with the 235uF smoothing cap, then the 2x 6D22S and a 5H choke (both in the neg. line), then 470uF reservoir cap. No noise, no hum, slow start-up and very stiff.
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Follow Ups
- Graetz bridge loses more volts than series diode - Ray Moth 08:19:59 12/15/05 (3)
- Re: Graetz bridge loses more volts than series diode - fatbottle 16:26:59 12/17/05 (1)
- Re: Graetz bridge loses more volts than series diode - Ray Moth 06:41:58 12/19/05 (0)
- Re: Graetz bridge loses more volts than series diode - DHT 4 ME 06:43:27 12/16/05 (0)
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