vac tubes / was Re: Schematics of Atanasoff-Berry

[Chuck Guzis]

On 2 Sep 2008 at 23:55, Brent Hilpert wrote:

> Make something using enough tubes and one can wire up the filaments in
> series as they were intended for.. 

If you run from line voltage, be sure to hang an NE-2 (with built-in 
series resistor) in parallel with each heater so that you can easily 
see when one opens up.   That used to be one of the time-eaters when 
servicing the old series-heater TV sets.

Cheers,
Chuck