In Reply to: RE: grid resistors first stage of amp posted by Tre' on June 24, 2012 at 17:28:15:
Because the screen in a pentode reduces Miller capacitance to near zero. With a triode (12AX7) the Miller effect can be substantial
Once again, Randall Aiken's site provides some excellent info - click the link below.
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Follow Ups
- RE: grid resistors first stage of amp - Jim McShane 13:14:33 06/25/12 (9)
- RE: grid resistors first stage of amp - Tre' 14:34:57 06/25/12 (8)
- RE: grid resistors first stage of amp - Jim McShane 15:41:48 06/25/12 (1)
- You may be right - Tre' 15:56:33 06/25/12 (0)
- It dawns on me that the grid resistor does lower the source impedance but... - Tre' 14:55:16 06/25/12 (5)
- A triode driver example - Tre' 15:30:26 06/25/12 (4)
- RE: A triode driver example - Triode_Kingdom 16:26:14 06/26/12 (3)
- RE: A triode driver example - Tre' 20:01:05 06/26/12 (2)
- RE: A triode driver example - hennfarm 21:14:01 06/27/12 (1)
- RE: A triode driver example - Tre' 09:13:50 06/28/12 (0)