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2nd August 2010, 05:49 AM
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diyAudio Member
Join Date: May 2007
Location: Eskilstuna, Sweden
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Variation on Rodīs bias servo
In the Spud, Schade, PP, Anti-triode ECL86 thread Rod Coleman suggested a very nice and practical bias servo.
With the help of a sensingresistor in the anodecircuit a simple single-transistor servo was made that levelshifted down to a suitable level. When using a servo a mains toroid can be used as OPT. In this one a DC-connected 6S45 is used as a single driver . To phase-reverse the signal for the other output tube a Schaded depletion-FET(pref.IXTP01N100) is to be used. By combining Rods servo with an OP-amp integrator, for both phase-reversal and filtering, and sending the correcting-voltage back to the FETīs gate everything seems to work in theory. R18 is used to set initial balance. Will this work IRL? It might maybe be some time-constant issues.
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Brgds Lars Last edited by revintage; 2nd August 2010 at 06:13 AM. |
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