Why is the 65 Amps London's EF86 channel so chimey....

[PeterS]

Plate was around 75v and screen was around 105v.

Similar to my voltages with those resistor values. Makes me think possibly a real VOX would also have those voltages.

Is there any reason why it would be bad to have the screen above the plate? It means that any secondary electrons that get knocked off the plate get accelerated towards the screen, but at these low voltages I don't think that matters.

[VTAMPSUSA]

Sorry this is an OLD, OLD thread. But has anyone considered NOT fully bypassing the EF86?


Like, maybe, without the boost mode, they only have a very small bypass cap that only boosts the very high frequencies that get attenuated by a large anode resistor? And when they boost, they fully bypass. I'd guess they are also using a bright cap directly after.

I'd done this with triodes using 22n-10n and you can get an incredible amount of chime independent of volume position.