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Simplest possible tube regulator -- will it work?
Simplest possible tube regulator -- will it work?
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Old 12th August 2018, 06:37 AM   #21
denny9167 is offline denny9167  United States
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Counting on thumbs: single straight 6SN7 gives gain about 14. Used as a pair this way, about half, say 7. Gain of 7 is 17dB. Your low plate resistor may give less. So you may not get 18dB, though you could get close, with _no_ NFB applied.
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Old 13th August 2018, 12:49 PM   #22
denny9167 is offline denny9167  United States
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I made a few changes in Spice and was able to get a good simulation using a 6080, total output noise was 160nWs, which translates ripple voltage in the micro volt region. This one is set for 300VDC.
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Old 13th August 2018, 01:01 PM   #23
denny9167 is offline denny9167  United States
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Here is a completed power supply in a line stage I built.
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Old 13th August 2018, 01:49 PM   #24
jackinnj is offline jackinnj  United States
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Simplest possible tube regulator -- will it work?
R10/C47 could cause stability problems around the LM317 -- they drop the gain precipitously near 20kHz -- consider changing R10 to 10R and C47 to 10u.
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Old 13th August 2018, 02:41 PM   #25
denny9167 is offline denny9167  United States
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R10/C47 could cause stability problems around the LM317 -- they drop the gain precipitously near 20kHz -- consider changing R10 to 10R and C47 to 10u.
Thanks it cuts the noise floor in half!!! According to my simulations.
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Old 13th August 2018, 06:50 PM   #26
hego is offline hego  Europe
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Is like a Maida with tube.
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Old 13th August 2018, 07:08 PM   #27
denny9167 is offline denny9167  United States
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Is like a Maida with tube.
Yes Sir. Iím just now starting extensive listening tests, Iíve never
Heard such silence when the musics not playing!!
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Old 13th August 2018, 07:19 PM   #28
denny9167 is offline denny9167  United States
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I have several 6080ís and this is a good way to use them brings
Out the best in the tube!!
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Old 13th August 2018, 09:39 PM   #29
jackinnj is offline jackinnj  United States
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Simplest possible tube regulator -- will it work?
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Thanks it cuts the noise floor in half!!! According to my simulations.
Also causes the regulator to be only marginally stable.

LM317 isnt a quiet regulator by any stretch. If you must use an LM317, for lower noise hang a 10uF aluminum electrolytic off the ADJ pin.
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Old 13th August 2018, 09:41 PM   #30
denny9167 is offline denny9167  United States
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Also causes the regulator to be only marginally stable.

LM317 isnt a quiet regulator by any stretch. If you must use an LM317, for lower noise hang a 10uF aluminum electrolytic off the ADJ pin.
Do you think the LT1084,or LT3080 would be a better choice?
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