[ARC5] Loctals and Hickok 6000A

[Kenneth G. Gordon]

On 13 Oct 2019 at 0:00, spr at earthlink.net wrote:

> True enough, but the tube manuals recommend nominal =/- 5%, for instance 6 to 6.6 volt for a 6.3 V heater.

Yes..."...for maximum life....". That doesn't have anything at all to do with what voltage range 
over which the tube will work.

> An automotive sytem will generally be between 11 and 14.5 volts, except when starting.

Again, true. And "12 volt" tubes will operate just fine at voltages between less than 6 and 16 
V.

When ARC engineers first offered one of their 24 V receivers to the military, the military 
operated that receiver in an airplane with a 12 V system, and the receiver worked just fine.

So impressed the military that they bought the ARC gear.

Ken W7EKB