I found it by ebay, follow the link .....maybe its usefull for my 50 ma DYNACO EL34 tubes ??!!
thx, Mell
Automatic bias regulator for tube power amplifiers KT88 bei eBay.de: Amplifiers Tube Amps (endet 04.07.11 12:04:28 MESZ)
thx, Mell
Automatic bias regulator for tube power amplifiers KT88 bei eBay.de: Amplifiers Tube Amps (endet 04.07.11 12:04:28 MESZ)
This appears to be a CCS, but an internal dynamic resistance of 1k sounds a bit low. A CCS is a good way of ensuring that the bias for the output valves is wrong, as it controls the wrong thing: average current instead of quiescent current. A cathode resistor is better. Better still is either fixed bias, or a zero crossing sampler which actually controls quiescent current.
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