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In the Forum: Melquiades Amplifier
In the Thread: Grid bias power supplies
Post Subject: Do incremental steps.Posted by Romy the Cat on: 3/3/2006

 AnonymousUser wrote:
Thanks for your response! I have never tried grounding the cathode in any of my tube projects. Even my amp output stages have been mostly cathode biased. But I am going to try grounded cathodes (and the +/- input stage supply) in my next amp, which is going to have a 404a input tube. 

Floyd ,

Why do you have to have a cap in cathode and why juice should flow form ground to cathode via this hugely auditable capacitor? Even grid cap affect sound less then a cathode cap…. Grounded cathodes are the way in which I feel everything should be used. Anyhow, Floyd, I do not think that +/- input stage supply is a panacea solution and would sound correct in all cases. In my Baby Milq (headphones) with 6C19P it is not as affective as with 6E5P. You might for deigning try to use +/- bias milling the B+ and negative supply via the voltage groping resistors. If you find that this INCREMENTAL STEP will work out for you and “sound” better then cathode bias then you might try the isolated the +/- bias supplies via regulators. Please let know how it will work out for you

Rgs,
Romy

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