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Originally Posted by daviddeakin
Another method would be to lower the heater voltage. This will considerably increase ra for a given bias voltage, but also increase linearity!
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Not convinced. The current flow is primarily controlled by electrostatics and the mechanical construction, whereas the heater controls the size of the pool of available electrons around the cathode.
But agree regardings signal path - every component between the "signal path" and signal ground will have an influence.
TTFN,
Jon