[Steve Davis]

About two years ago, I started the restoration of a Philco 19 chassis. I did a total recap, replaced a few out of tolerance resistors. The feedback winding of the oscillator coil was open. I removed the coil, unwound the tickler and baked the form at 200 degrees for about an hour. I rewound the coil and installed it in the chassis. When I started to do the alignment, I discovered, the oscillator would die out on the low end of the dial (I believe it was the low end, it's been a while). I had already changed the oscillator cathode resistor to 10K. I tried another tube, no good. I then tacked another resistor in parallel to the 10K to bring the resistance down to about 7500, still no good.

I have restored four or five 19/89 chassis and this was the first time I was unable to get the oscillator to work. I waved the white flag and put the radio back on the shelf. About two months ago, I decided to take another crack at it. I removed the coil and added a couple more turns to the feedback winding. After reinstalling, the oscillator would not work at all. I'm sure I messed something up when I installed the coil but. At that point, I was pretty discussed. I made the decision to do Ron's "Super" mod.  Take a look here   http://philcoradio.com/phorum/showthread.php?tid=14919

  

I didn't have a very good seven pin tube socket so, I ordered a few made in China ceramic sockets. I had an extra coil form so, while waiting for the sockets to arrive, following Ron's instructions, I wound the new oscillator coil.


[Image: https://c1.staticflickr.com/3/2942/33618...115d_k.jpg]109_0238 by Steve Davis, on Flickr
The sockets arrived. They look to be well made.      
                                                                                 [Image: https://c1.staticflickr.com/3/2937/33618...5659_b.jpg]109_0240 by Steve Davis, on Flickr      More to come in a few days.   Steve