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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, 01:44 AM   #11
denny9167 is offline denny9167  United States
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One note on schematic screen resistor is actually 100 and not 470 ohms.
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Old 12th August 2018, 01:45 AM   #12
rayma is offline rayma  United States
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Quote:
Originally Posted by denny9167 View Post
I’m using it in a line stage. I was really surprised how quiet It is!!
Can you post the schematic for the whole thing? How much gain does the line stage have?
In some regulator circuits, the output capacitors (if not sized right) can cause noise peaking.

Last edited by rayma; 12th August 2018 at 01:51 AM.
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Old 12th August 2018, 01:46 AM   #13
denny9167 is offline denny9167  United States
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Originally Posted by rongon View Post
OK, that is true that it's a conceptual circuit.

A tube series regulator would need a tube error amplifier, which means another cathode to heater voltage limitation that can't be violated. That could mean two separate heater supplies would be needed, one for the pass tube and the other for the error amplifier tube.

How about if the suggested protection diodes, etc. were in place? Something like the attached...
Iíve tried running this thru spice using a 6080 tube, it doesnít simulate well, but
Could be just a glitch or poor spice model.
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Old 12th August 2018, 01:49 AM   #14
denny9167 is offline denny9167  United States
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Quote:
Originally Posted by rayma View Post
Can you post the schematic for the whole thing? How much gain does the line stage have?
In some circuits output capacitors, if not sized right, can cause noise peaking.
Sure
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Old 12th August 2018, 01:51 AM   #15
rayma is offline rayma  United States
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Originally Posted by denny9167 View Post
Sure
Is the variable resistor the volume control?
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Old 12th August 2018, 01:53 AM   #16
denny9167 is offline denny9167  United States
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Quote:
Originally Posted by rayma View Post
Is the variable resistor the volume control?
It adjusts the amount of feedback to set the gain for the stage.
But I’ll have to lower the 280K resistor to about 47k to really lower the gain.
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Old 12th August 2018, 01:56 AM   #17
denny9167 is offline denny9167  United States
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I’m looking to adjust the gain from about 10dB to about 18dB.
This will help it mate with many different amplifiers.
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Old 12th August 2018, 02:01 AM   #18
rayma is offline rayma  United States
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Originally Posted by denny9167 View Post
I’m looking to adjust the gain from about 10dB to about 18dB.
This will help it mate with many different amplifiers.
The 5.6uF output coupling capacitor C1 is within the feedback loop, so it's pretty large.
I've had good results with only 1uF in similar circuits. Do you want to drive low input
impedance amps?
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Old 12th August 2018, 02:11 AM   #19
denny9167 is offline denny9167  United States
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Iím looking to adjust the gain from about 10dB to about 18dB.
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Old 12th August 2018, 04:30 AM   #20
PRR is offline PRR  United States
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Quote:
Originally Posted by denny9167 View Post
I’m looking to adjust the gain from about 10dB to about 18dB.
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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