Posted by Damir [ 213.202.97.47 ] on January 25, 2006 at 14:49:11:
In Reply to: Re: Bias supply posted by manualblock on January 25, 2006 at 11:01:21:
Well, we have a CCS (sink), common for both tubes (diff. phase splitter/driver). DC voltage between the cathodes (connected together and "CCS-ed"), and the ground is only a few volts, and for good work CCS "needs" more, at least 20V. We must use a "negative rail", or -20V referred to ground. Heatsink must "deal" with P=U*I dissipation, and if we use large neg. voltage, then we apparently need large heatsink:-)
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