[NJARC] Philco 37-84 almost there! maybe?

[Aaron Hunter]

Dave

Al is on the money, but you didn't say if any of the bands work.  With 
two antenna transformers and three switch positions, I would expect 
something to work. 

I was playing with a like vintage Philco that had a burned out power 
transformer, shorted filter cap, burned out power resistor, wrong size 
bypass cap, missing capacitor terminal block and all in the power supply 
circuit.  I straightened all that out and on powering up, only one short 
wave band would work.  On looking at the band switch, I found unsoldered 
wires and decided to put the radio back in storage since I don't have a 
place to display it anyway.  Point is, since someone may have played 
with the chassis previously, check for bad connections and broken or 
missing wiring also.  You can even use you "test finger" to trace back 
to the antenna.  Just stay away from the B+!   =-O

Aaron

Al Klase wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Hi Dave,
>
> The finger is an excellent signal injector.  :-)  There isn't much 
> between the grid cap and the antenna terminal.
> First, attempt to adjust the RF trim cap, #5 on the schematic, after 
> you've tuned the radio to a station near the high end of the band with 
> finger in place.
>
> If no good, use ohm meter to check both winding of the antenna 
> transformer and associated connections. Consult the schematic:  You 
> should have a low resistance, probably less than 1K, from the 1st 
> detector grid cap to ground.  Antenna terminal to ground should show 
> 20K with the volume control full CCW, and that value should go down 
> when you advance the volume control.
>
> I'm sure you can hack it.
>
> Good luck,
> Al
>
> Mstang6T5 at aol.com wrote:
>
>> Visit our web site - See http://www.njarc.org
>> _______________________________________________
>> Hi all,
>>
>> I'm a novice member who needs a little help. My Philco 37-84   
>> restoration has gone well, re-capped - new resistors - "IF" coil 
>> problem fixed.  However I only receive a signal when I place my 
>> finger on the grid cap of the  Det-Osc tube (6J7G). The signal is 
>> good and clear. Do I just need to trace the  signal better? Any help?
>> Have a Happy Thanksgiving,
>>
>> Dave LeMay :-) _______________________________________________
>>  
>>
> Al Klase - N3FRQ
> Flemington, NJ
> http://www.skywaves.ar88.net/
>
>
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