[Milsurplus] Re: half-voltage dynos

[Hue Miller]

----- Original Message ----- 
From: "William Donzelli" <wdonzelli at gmail.com>

> > When I get some time, I'm going to see if I can recreate
> > those conditions and measure just how well they work
> > at half-speed on the filaments.
  
I would say, half voltage on plates, okay.
Half voltage on heater, "maybe". 
( There were some space-charge circuits published in some book 
like "Radio for the Millions " that reduced tube heater voltage to 2/3 
spec - BUT - these were space charge circuit - optimized for low B+. )
Half voltage on heater and plate, "no way".

> It might be fun to see how it works, but do not leave it that way. The
> lives of most tubes is drastically shortened when filament voltage is
> dropped too low.
> 
> --
> Will

Only for very large transmit tubes. For receiving tubes, same as light bulbs:
life is greatly lengthened.
( Caloric restriction works in electronics also ?? )
I have not seen any results of a test on 50% restriction. I have seen some-
where the statement in print, and i think it was substantiated by figures, that
even a 10% reduction in heater current lead to substantial longer life.
(same as in the organic world. )  -Hue Miller