It all depends on the valve's application, for regen detectors a low emission valve will work ok as long as there is enough emission in it to get the circuit to oscillate or just about oscillate, with a regen it's not usually a problem as the amount of regen coupling can be increased by advancing the regen control to offset the loss in emission.
But for instance in a superhet the emission of the oscillator valve is a bit more critical as the amount of regen coupling is fixed
Lawrence.
But for instance in a superhet the emission of the oscillator valve is a bit more critical as the amount of regen coupling is fixed
Lawrence.
