Can anyone help with the 'ra' of a 6V6 in triode mode please? Approx. 150v anode to cathode.
Ra depends on anode current and voltage.
You can find a datasheet at "Frank's Electron tube Pages".
General Electric 6V6GTA datasheet:
Find the plate curves for triode operation.
Estimate Ra = du/di at your operating point.
At 150V, 60mA approximately 2000 Ohm,
At 150V, 10mA maybe 3 or 4000 Ohm.
Thanks Kees. That will do nicely!
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