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RE: LM317 for PP cathode biasing?

Posted by coffee-phil (A) on February 20, 2015 at 12:07:28

In Reply to: RE: LM317 for PP cathode biasing? posted by DAK on February 20, 2015 at 10:18:52:

Hi DAK,

If you want to go Class A you will lose some output power in order to stay within the dissipation rating of the tubes. You do want the cathodes connected together and NOT bypassed with a capacitor. This way the even order non-linearity of the tubes will cancel.

Stay within the ratings of the tubes and the current source which you use.

You may get some improvement just by replacing the cathode resistor with the current source. If we know the turns ratio of the transformer and your speaker impedance, and can lower the plate voltage, the operating point can be optimized to give you the most power you can have staying within the rating of the tubes.

Phil

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