[NJARC] Help with Philco Transitone 53-562

[w2wiq1 at juno.com]

HI AARON:

FILAMENT STRINGS ARE NOT ALWAYS WIRED PIN TO PIN AS SHOWN ON SCHEMATICS.APPARENTLY THAT IS THE CASE HERE.THE RESISTOR WAS WIRED IN A DIFFERENT SECTION.

THE SCHEMATIC SHOWS IN THE NOTES THAT THE LINE VOLTAGE DESIGNED FOR AT THAT TIME WAS 117V.AS YOU WELL KNOW MOS LINE MAINS ARE AROUND 124/125V OR SOME TIMES MORE.WITH THAT IN MIND I SUGGEST USING A 120 OHM RESISTOR.
A 5 WATT WILL STILL RUN WARM SO INORDER TO REDUCE HEAT UNDER THE CHASSIS I WOULD USE A 7 WATT.MY CALCULATIONS COME UP WITH 2.85 WATTS DISSIPATION.

STEVE-THAT SPLIT RESISTOR IS THE ONE MARKED 100 IN THE FILAMENT STRING.

WALTER-W2WIQ



---------- Original Message ----------
From: Aaron Hunter <ahunter01 at comcast.net>
To: "w2wiq1 at juno.com" <w2wiq1 at juno.com>
Cc: sgt88 at atlanticbb.net, njarc at mailman.qth.net
Subject: Re: [NJARC] Help with Philco Transitone 53-562
Date: Thu, 04 Apr 2013 17:04:08 -0400

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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