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#26
June 9th 04, 09:11 PM
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Avery Fineman wrote:
In article , (The Eternal Squire) writes: -- snip -- 4. Designing a circuit using battery powered, directly-heated filaments as a differential pair is going to be difficult...unless you have a separate "A" battery supply for that differential pair. Since the cathodes ARE the filaments, not separate as in indirectly-heated tubes, those cathode-filaments are going to be elevated or, if run near common, will require a "B-" supply for the long-tailed pair's large "cathode" resistor. -- snip -- I agree with everything else, but at RF you can just make a bifilar-wound filament choke -- you'll be at DC ground but you can inject whatever signal you want. Since everything is so high impedance and you want low power you can make it the final inductor in a matching network, for that matter. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com |
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