[NJARC] Philco 42-321

[Edward Otte]

Jim,

I am not sure I fully understand. I just started taken note of the schematic
and it dawned on me. Depending on how I hook the AC plug into the socket the
chassis will either be ground/ neutral 0 volts or 120 Volts hot! Yikes! So
the -B supply goes there too. 

But I agree with you how many Henry's could there be in a wire twisted six
or seven times around a 1/2 inch capacitor. 

Edward

Edward
This is an AC/DC set and it predates polarized plugs.  So it looks like
it is a series LC circuit used to connect the B- power supply terminal
to the chassis.

It would be nice to know the inductance so we could calculate the
resonant frequency.  Need to know how many turns of wire and what is
the cross section of the capacitor? And then there is the matter of Q.

I don't think Philco used this circuit for long.  I don't remember
seeing this in a late 40s AC/DC set I reworked that had AM and both the
old and new FM bands.  My gut feeling is that this inductor is not at
all critical and can be deleted when you replace the old wax coated
ones with modern capacitors.
Regards,
Jim

--- Edward Otte <edotte at optonline.net> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> 
> Hello all,
> 
> I have a general question about the Philco 42-321. There is a
> "condenser &
> choke assembly" which consists of a 0.2 uF capacitor with a number of
> wires
> wrapped around it. There is a Philco part number but what if I wanted
> to
> replace it? The coil portion is just a wire and it has a certain
> radius
> would I have to recreate this or is there an easy solution? Thanks in
> advance.
> 
> Edward
> 
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