Quote:
Originally Posted by Herald1360
Quote:
Originally Posted by crackle
I am not an expert but I would expect more reactance to occur with more capacitance as it is a type of positive feedback.
Lowering the capacitance would lower the volume. Likewise lowering the heater volts would also lower the efficiency of the valve having a similar effect. So I would assume lower resistance goes with lower reactance.
But I may be wrong.
I wonder why this thread was not moved to the original thread in the radio section.
Mike
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That sounds backwards- a lower resistance in the heater circuit will give more emission and presumably more gain.
Which way round the C-R interact would depend on whether the effects were required to be additive or subtractive. Given the endless historic discussions about the difficulties with achieving smooth reaction control, it may be that making the resistor greater (less gain) as the capacitor value increased (more positive feedback) was useful to tame things.
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Chris, you are so right, what a silly mistake. For some reason I was thinking lower volts on heater and wrote about lower resistance.
thanks for correcting it.
Mike