[NJARC] Help with Philco Transitone 53-562

[Aaron Hunter]

Steve

Don't worry about the 12AV6 connections.  If you trace the schematic out 
closely, you will see they do connect together.  But then, you didn't 
say whose schematic you're using.

The schematics I looked at have a varistor between the 35C5 and 12BA6.  
But no matter where it's located as long as it's in the filament 
string.  To quote the Philco service sheet, "R12 100", "tube saver 
resistor approx 880 ohms at room temperature."  If I did all my math. 
correctly, with a resistor rated at 100 ohms with 0.15 amp. going 
through it, it drops 15 volts.  Adding all the tubes and the resistor, 
that's an operating voltage of 122.8 volts.  The service sheet says 105 
to 120 volts so I guess I'm on target so far.  15 volt drop times 0.15 
amps. gives 2.25W dissipation.  You should double the wattage to be safe.

Aaron

w2wiq1 at juno.com wrote:
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
> HI STEVE:
>
> THE 12AV6 ARE SUPPOSED TO BE CONNECTED TOGETHER AND THEY GO TO THE COMMON GROUND.NOT CHASSIS GND.
>
> LOOKING AT THE FILAMENT STRING 35C5 PIN 3 AND THE 12BA6 PIN 4 IS THAT VARISTORTHERE?
>
> WALTER-W2WIQ
>
> ---------- Original Message ----------
> From: <sgt88 at atlanticbb.net>
> To: <njarc at mailman.qth.net>
> Subject: [NJARC] Help with Philco Transitone 53-562
> Date: Thu, 04 Apr 2013 15:21:44 -0400
>
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
> Just put it onto the bench...
>
> split/blown BIG resistor not shown on schematic..nor parts list:
> Â Â Â Â 47K ...1-1/8 inches long x 1/2 diameter = old 10 watter??
>      between pin 4 of 35W4 and pin 2&3 of 12AV6
>
> 2.  pins 2 & 3 of that 12AV6 are surely soldered together:
>       schematic shows NO connection with these two pins????
>
> Do not have "Notes" which may show addition of these details....
>
> Curious that my ( first? ) radio problem doesn't match with the Philco 
> pages...
>
> "Help".......
>
> Tnx,
> Steve
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