[Amps] Hallicrafters HT-41

[Colin Lamb]

I looked at the RCA specs for the 7094, which specifies 1500 volts CCS and 2,000 volts ICAS for a conventional amplifier.  It did not include data for grounded grid service.  Normally, the max voltage is higher, but I did not find that voltage specified.  

The HT-41 manual states the voltage is 1800 volts under 400 ma load.  

The manual assumes the power line is 117 volts.  Therefore, if you raised the voltage to 125 volts, you would expect 1923 volts on the plate at 400 ma.

The voltage drop of an 866 is less than a vacuum tube and I found data that claims 15 volt drop.  The voltage drop of a silicon rectifier will be .5 to .7 volts per device.  You can count the devices and then subtract the total from the expected 15 volt drop of the 866.  

Using the above data, a wild guess is that the voltage will only increase 10 volts.  Normally, it is not voltage that kills the tube, it is plate dissipation.  

73,  Colin  K7FM