Tube DIY Asylum

RE: Of course you wouldn't need a negative bias supply with 2.3k on the cathode.

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Triode_Kingdom

In Reply to: RE: Of course you wouldn't need a negative bias supply with 2.3k on the cathode. posted by Michael Samra on May 22, 2017 at 17:06:50

Michael, you do realize that I said "under the choke," right? Such a bias supply would increase the tube's conduction.

The output capacitor is 33uF. It was selected for the purpose of testing levels and frequency response.

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Buy Chinese. Bury freedom.

Follow Ups:

RE: Of course you wouldn't need a negative bias supply with 2.3k on the cathode. - Michael Samra 04:26:28 05/23/17 (2)
I did realize that but excuse me for being a thick in head here.What do mean by under the choke? The resistance of the of cathode is lower then the choke?

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

Edits: 05/23/17
- RE: Of course you wouldn't need a negative bias supply with 2.3k on the cathode. - Triode_Kingdom 06:31:52 05/23/17 (1)
  I meant that the cold end of the choke should be disconnected from ground, and a negative bias applied there. This is a solution for a tube type that doesn't otherwise conduct sufficiently due to the relatively high DCR of the choke.
  
  --------------------------
  Buy Chinese. Bury freedom.
  - Ah ok. - Michael Samra 11:49:59 05/23/17 (0)
    I saw that principle applied in some circuits.Anyway,all I could think of was the above ground DC source we apply to filaments to kill hum in high gain circuits.
    
    "For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

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