• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Current sourced heaters in a CF

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#21
Considering the fine sonic upgrade I got by using LM317 current source I would think its worthy to investigate a superior descrete CCS. Do you have any promissing circuit in mind that is fairly developed and tested?
 
#22
Been away... Not yet. Although uprating a cascode to take account of the current or simply using a DN2540 depletion-ode JFET would work, it wouldn't necessarily be very temperature stable, so a little more thought is probably required. Watch this space...
 
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