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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: The lm317 is a constant voltage source posted by Al Noakes on May 10, 2016 at 01:26:44:
"It's useful for maintaining balance in a pushpull amp...."
DC balance? I don't see how with only one shared CCS.
Without a bypass cap the impedance of a CCS is high giving a large error feedback signal that maintains dynamic AC balance. At any given moment that error signal is negative FB for one tube and positive FB for the other, forcing AC balance.
With a bypass cap there's no corrective signal.
In terms of DC, the total current will match the set current but why would that current necessarily be evenly divided between the two output tubes?
I don't see the mechanism to accomplish that.
Tre'
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- RE: The lm317 is a constant voltage source - Tre' 08:19:20 05/10/16 (1)
- RE: The lm317 is a constant voltage source - JKT 10:30:15 05/10/16 (0)
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