Philco 570 - Printable Version
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RE: Philco 570 - rfeenstra - 04-30-2019
It lives again! Stations all across the dial even without the tube shield. Now I need to replace the dial and work on the speaker. Notice the awesome recone job that someone did! Very stiff card stock with no ability to move. High frequencies are good!
RE: Philco 570 - Jake Blake - 04-30-2019
YEEEEAAAAH!!!!!
RE: Philco 570 - morzh - 04-30-2019
Woo-hoo!
Mine is next.
I think the speeker is deehd.
RE: Philco 570 - rfeenstra - 05-02-2019
I robbed the cone from a Celestion speaker that was used in Allen Organ speaker cabinets a few years ago. I wish the diameter was about 1/2" larger, but it will do. Sounds MUCH better than the "cone" that someone put in previously. I have some bass now since the cone can move! Next I need to clean up the tube shield that I bought off from paybay. I will try to preserve the the 2 original stickers (patent and tube layout diagram).
As I have found often in the past, tracking is a problem. I can get the frequencies close enough, but the RF and Detector don't track well causing the sensitivity to vary dramatically from one end of the dial to the other. I've been able to improve that dramatically by judicious plate bending. Lots of trial and error. I suppose it really doesn't matter since the radio will probably never be used seriously and having it work well on one end of the dial for demonstration purposes would be all that's really necessary . But hey, getting to work better than it probably ever did is kind of fun.
RE: Philco 570 - Greggshere - 05-05-2019
Rfeenstra I'm currently rewinding a power transformer. What kind of paper did you use as the insulator between each set of windings? Thank you!
RE: Philco 570 - rfeenstra - 05-05-2019
The primary windings seemed to have heavier paper so i used tracing paper. The HV windings were very thin so I used waxed paper. The various sections were separated by fish paper, .01" I believe. I believe that's what you were asking and that appears to be what was used originally. Each layer of wire is "glued" in place with shellac. Shellac also holds the paper in place, drying it with a heat gun. There are probably better ways but this seems to work for me. Since the fish paper is quite stiff and unruly, I use 5 min. epoxy to to hold it in place.
RE: Philco 570 - Greggshere - 05-09-2019
Thank you sir, I'm giving it a go on a PT from an old reel to Reel.
RE: Philco 570 - Ron Ramirez - 05-09-2019
Great job on that transformer, Rob!
For that matter, great job on the entire chassis!
RE: Philco 570 - rfeenstra - 05-09-2019
Thanks Ron! I don't like having to paint a chassis but they do look quite nice when done. Someday I may try plating a rusted chassis. On these Philco's, you can't remove the shields so one would have to try brush plating around them. Some day....
Radio is working great except for the 70 distortion!
Look for a PM from me.
Rob
RE: Philco 570 - Ron Ramirez - 05-10-2019
Agreed, I don't like painting chassis either but sometimes you just have to. Although I would like to try stripping and dunking a badly rusted chassis in Evaporust sometime and see how that turns out. Of course it would have to be plated or painted afterwards.
Unfortunately plate distortion is something one must put up with with the "power detector" circuit. I tried modifying a 70 once with diodes and a 27 in place of the 24, but I was not pleased with the results. Others have reported good results with that mod. Maybe I did something wrong.
PM received, and replied to, thanks.
RE: Philco 570 - Ed Locker - 05-10-2019
Ron, If I were rich and famous and could afford gasoline, I'd bring one of my modded 70's over to you for your stamp of approval. I've done 2 70's and a 370CS. Or maybe next time you are in this area, you can stop in?
RE: Philco 570 - Ron Ramirez - 05-10-2019
Ok Ed. Or please email your circuit to me. I have an unrestored 70 here and I'm willing to try it again.
RE: Philco 570 - Ed Locker - 05-10-2019
If I can find it. I have it on paper but no scanner. I had it on this 'puter years ago.
Lemme look.
If needed, I can always snail mail it to you.
RE: Philco 570 - rfeenstra - 05-10-2019
Ed, i'd love to see what you do with the 70 as well. I've got 2 that I would like to mod.
RE: Philco 570 - Ed Locker - 05-11-2019
rfeenstra, send me your email address. I found the schematic on this computer. It's from 2004!