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In Reply to: Here's VTL explaining biasing their amps posted by Tre' on August 25, 2023 at 06:32:11:
with 10 ohm sense resistors. One for each of the four output tubes. The output tube have 40ma. of idle current each so that is .4 volts across 10 ohm. The 4 bias pots can be seen on the schematic being feed by the "-VL" from the -50vdc bias power supply.
Again the 10 ohm resistors in the cathode circuits are not cathode bias resistors but sensing resistors. The output tubes in this Velleman amplifier are fixed bias, not mixed bias or cathode biased.
Tre'
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Follow Ups
- Here is another fixed bias amplifier - Tre' 08/25/2306:47:00 08/25/23 (3)
- for contrast here is an amplifier with cathode biased output tubes - Tre' 09:25:50 08/25/23 (2)
- He has abandoned ship - Triode_Kingdom 12:05:15 08/26/23 (1)
- Maybe. nt - Tre' 17:04:07 08/26/23 (0)
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