On Sun, 13 Jun 1999 14:29:21 -0500 "Monty Taylor"
<montytaylor@texoma.net> writes:
> I did try to look up a schematic for a Collins 30S1 on the
>http://bama.sbc.edu/images/col-ltr.jpg web page, (had a letter from
Collins
>saying schematics cannot be posted anymore) as I knew that amp had a
>rheostat to adjust the filament voltage. Can anyone tell me what
values,
>components and tips I should use to obtain a more accurate and stable
>voltage reading?
>
>Regards
>Monty/WB5GLB
>
Hi Monty,
The 30S-1 metered the heater voltage on the primary side of the
transformer. Likely Collins calibrated the meter by measuring the
resulting filament voltage at the pins...
They used a 35 ohm rheostat in series with their transformer which
incidently is operating at around 1/3 the power of your pair of tubes.
I hope that helps!
73,
Marv WC6W
*
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