[Amps] filament supply options

R.Measures r at somis.org
Sun Apr 25 09:19:06 EDT 2004


On Apr 24, 2004, at 10:45 AM, Steven Grant, W4IIV wrote:

> Hi steve
> the voltage shoud be 4.8 volts for maximum tube life. 5 volts or more=20=

> will cut tube life with very little benifit.
> the reason AC is used has to do with biasing, 5 volts DC with this=20
> tube will affect biasing (in many amps, 5 volts is what they use to=20
> bias the tube to cut off)

=F0  Steve :   25v will typically bias a 3-500Z to cutoff.  5v is =
typical=20
operate bias.

> ...
>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org



More information about the Amps mailing list