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Autobiasing output tubes (6L6)?
Autobiasing output tubes (6L6)?
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Old 14th August 2019, 01:16 PM   #51
JMFahey is online now JMFahey  Argentina
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I also read "auto bias" as Cathode bias, not considering grid leak bias here which is also "auto" because we are talking power tubes.

Label might be applied to more complex Servo or even Microprocessor based solutions but if so IŽd make it clear what are we talking about.
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Old 14th August 2019, 05:04 PM   #52
mesherm is offline mesherm  United States
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I have used TL783 voltage regulators as cathode constant current sinks in my SE and PP tube amps with excellent results. Simple, cheap and effective if you don't mind a bit of sand in your amp.
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Old 15th August 2019, 02:42 PM   #53
Ketje is offline Ketje  Belgium
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Quote:
Originally Posted by Wavebourn View Post
The only adaptive autobias I found worth using long time ago, was based on S/H and envelope sensing. It was an integrator in servo, using very low input current opamp and a teflon capacitor, with MOSFET switch before it that got closed when music level was above pretty low threshold.
That has to be the Sony patent !
Here is another one, if you like a puzzle
Mona
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File Type: png Autobias&balance.png (35.6 KB, 40 views)
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Old 15th August 2019, 05:58 PM   #54
Wavebourn is offline Wavebourn  United States
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Autobiasing output tubes (6L6)?
Quote:
Originally Posted by Ketje View Post
That has to be the Sony patent !
And they patented it 20 years before I started considering tubes worth using, re-inventing the wheel!
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