|[AMRadio] WTB/WTS and a question|
ve1adh at yahoo.ca
Fri Dec 30 17:12:53 EST 2005
--- Brian K Harris <brian.k.harris at philips.com> wrote:
> 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 what kind
> of battery put out 2V or 2.5V? I am building a
> solid state supply for the
> 2V requirement as well so the question is merely to
> satisfy my curiosity.
A wet cell. You will have to have very good filtering
on the filament supply to avoid hum as the filament is
also the cathode.
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