|[AMRadio] WTB/WTS and a question|
Mike Dorworth, K4XM
k4xm at arczip.com
Fri Dec 30 15:35:28 EST 2005
> > > > The tubes all have 2V filaments. The radio has two inputs for a
> > > > filament
> > > > supply, 2V or 2.5V (the 2.5V input merely inserts a series
> > > > resistor). My
> > > > question is....why did anyone manufacture 2V filament tubes and
>Two volt tube were used in the 19 twenties and thirties for FARM radios.
They used a 2 volt wet cell. One third of a car battery for those tubes.
Also The audio always push pull class B triodes for maximum B battery
utilization. Folks carried the cell to the service station or perhaps had a
windmill generator from a T model Ford connected for recharging. REA did not
start until about 1933 or so and almost no Farmer in America had Electric
power. The dry B batteries were 135 volt and lasted a long time but many
units had a vibrator pack that ran off a 6 volt wet cell battery from a car
or the Edison Electric Company. By the mid 1930's the 230's etc were amost
obsolete. Hope this helps HNY, 73 Mike
More information about the AMRadio mailing list
This page last updated 17 Feb 2018.