When I lived in Dallas, I purchased various sizes of low value power
resistors from Tanner Electronics. These were for setting filament
voltages to the correct value. They are a large surplus part outlet and
prices are very good. They have a web page.
73, Dan, N5AR
KG6DV@cs.com wrote:
>
> I found a very clean SB200 I couldnt resist. While checking this amp
> out I found an interesting situation, High filament voltage. The
> SB200 has no separate filament transformer. It uses one transformer
> with three secondary windings. I have always put filament variacs in
> all my homebrew amps but they all had separate filament transformers.
> The filament voltage on this amp measures 7.25 volts vs the 6.3 volts
> required by the 572B'S. Considering the fact that this about 15%
> higher than specs, Im not comfortable leaving it that way. Is this a
> common problem with the SB200'S ?
> Any suggestions on how to correct the problem?
>
> Ron KH6DV
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|