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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Understanding Class A triode operation...and PSU requirements posted by Jayme on February 1, 2007 at 13:50:39:
Jayme>>1) Is the voltage and current drawn from the B+ (under class A
>>operation) always a fixed amount? Or does it vary, even slightly?Yes the current varies.
The amount depends on the amount of signal and the load.
Draw a loadline to know for sure how much.<<2) Can operation of the triode be thought of as a Voltage
>>Shunt...so that a given amount of voltage is shunted through
>>the tube, and modulated by the grid in response to the input
>>voltage, with the remaining voltage component serving as
>>the "amplified input signal" and traveling through the
>>output cap?You can think of it as a voltage shunt
or a bias controlled resistor.>> does the PSU have to be critically damped to prevent
>> ringing if voltage/current changes?Definitely
>> Or, does this not matter, as intrinsically, the
>> voltage/current drawn from the PSU never changes,
>> and thus makes this point moot?Only if you are using a CCS on the plate.
A CCS forces the tube to conduct at the same current.
And also provides a high isolation from the PS noise.DanL
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Follow Ups
- Re: Understanding Class A triode operation...and PSU requirements - danlaudionut 14:21:36 02/01/07 (3)
- Ok...so... - Jayme 16:15:03 02/01/07 (2)
- Re: Ok...so... - danlaudionut 19:00:22 02/01/07 (1)
- Re: Ok...so... - Tre' 19:37:23 02/01/07 (0)
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