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In Reply to: RE: PI Balance posted by AmadeusMozart on June 17, 2021 at 16:03:07:
Two schematics from the RCA 26 manual, basically identical except for using a different output tube (and adjusting the B+ voltage).
To continue on my earler remark of having to adjust feedback loop and frequency compensation: Check the values of the feedback capacitor and the addition of frequency compensation in the phase splitter.
In the second schematic I like the way that the bias voltage is derived - an automatic adjustment when B+ comes on and there cannot be a run away because of a fault in the bias circuit.
This is what you have to figure out when not using the same components - especially transformers are troublesome, just any transformer which supposedly has the same impedance can result in total different behavior. This is due to interwinding capacitance and leakage inductance between primary and secondary. personally I would never ever consider trying to build a clone of the Williamson amplifier as it is only marginally stable and needed a very specially constructed OPT.
AM
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Follow Ups
- RE: PI Balance - AmadeusMozart 18:56:53 06/17/21 (1)
- Bias etc. - Triode_Kingdom 08:44:45 06/18/21 (0)
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