[Milsurplus] GO-9, AT-12 - fil choke

Marty Reynolds cosmoline at aa4rm.ba-watch.org
Fri Jun 5 15:29:26 EDT 2009


> OK, but several other things need to be mentioned that haven't yet.

> First,
> you need to connect the replacement chokes to the four points where the
> original was connected.

Gess I failed to say toroid wound with 2 CONDUCTER small speaker wire.  A
4-terminal
device

No disrespect, but have never had any single conductor speaker here.

>.....The 837 VFO filament is shunted by two 40 ohm 1
> watt
> resistors in series.  These up the nominal filament current to the VFO to
> 826
> mA.  The cathode is tied to the junction of these resistors and to some
> capacitors.  The center-tap of the filament supply winding on T-202 goes
> to
> ground through a 1000 ohm 20 watt resistor, which is the cathode resistor
> for
> the VFO.  If you use a 12.6 volt outboard filament transformer, you need
> to
> include the latter resistor.  I don't know just what effect simply
> grounding
> the center-tap of the 12 volt winding would have but it isn't likely to be
> beneficial.  And finally, you would need to bypass the 4.5 ohm IPA
> filament
> resistor.
>

Whew

Might you agree above all under term 'impementation?'  Think I'd just turn
it on
as is & send out some Vs to dummy load

   Marty


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