On previous experiments series resistor to heaters is 10Ω

So the 7586 Nuvistor heater voltage when the segues resistor is connected is not 4V but 3.7V. See Pleiades V6 microphone booster amplifier schematic,


With a 6MΩ resistor and anode supply 3.9V anode current is s healthy 25μA.


The word healthy is used as the 7586 electron tubes still amplifies at much less anode current, 1μA? when anode voltage gets really low, less than 1V? using a 2ΜΩ Pleiades resistor.


See next posts,