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Philco 49-909 - Printable Version

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Philco 49-909 - Jimradio - 04-21-2021

Hi, just started looking this radio over I have all the caps but one, it is the 2uf 50V in section 3, I-F detector and A-V-C circuits.
I do have a 4.7 400V, would that be a bit much for this.

RE: Philco 49-909 - mikethedruid - 04-21-2021

I think I would order a 2MFD condenser, maybe 100V. Looking at how that one is used, I am not sure if the higher capacity might screw something up, though probably not. Besides, the 4.7MFD 400V condenser is going to be a lot bigger than what you need there size wise.

RE: Philco 49-909 - Jimradio - 04-22-2021

thank you

RE: Philco 49-909 - Jimradio - 04-22-2021

This radio has a current limiting resistor, a 25 ohm part # 33-1334-5 what is the wattage. It is flex type resistor.

RE: Philco 49-909 - mikethedruid - 04-22-2021

Look in the library section from the home page of this website. There in the 1957 parts and accessories catalog, on page 28, you will find the listing for part 33-1334-5. The 33-1334 part indicates a flexible wire wound, fiberglass covered resistor, the last 5 indicates which one, in this case, a 25 ohm 2 watt resistor, with a body length of 1 inch, which in 1957 sold for 35 cents. if you are replacing it with a more modern type, you will want to go with a 5 watt wire wound, I would say....
https://philcoradio.com/library/download/parts/catalogs/1957/Philco%201957%20Parts%20and%20Accessories%20Catalog%20-%20Electronics%20Edition.pdf

RE: Philco 49-909 - Jimradio - 04-22-2021

Thanks Mike, I now have some on order.

RE: Philco 49-909 - Jimradio - 04-29-2021

Ordered a new volume control to replace the bad one.

I have a question, if I replace the 117Z3 rectifier tubes (2) with a 1N4007 diode & resistor, will I have to strap pin 3&4 the heater pins. It looks to this may not be necessary because they are not in the series with the other tube heaters?

What do you think?

RE: Philco 49-909 - Radioroslyn - 04-29-2021

I wouldn't but it would be real exciting if you did!!!
If you connect 3 and 4 together on the 117Z3 you'll be shorting the ac line out.

RE: Philco 49-909 - OZ4 - 04-29-2021

I think you answered your own question. The filaments are not needed for 1n4007 diodes. Don't forget that the silicone diodes only have a .7volt drop across them. Your voltages will be higher than the tubes.

RE: Philco 49-909 - Jimradio - 04-30-2021

WOW I blew that one thanks.

RE: Philco 49-909 - Jimradio - 05-02-2021

.pdf 49 909 power.pdf Size: 216.52 KB  Downloads: 148

How would you place the diodes and resistors to replace the 117Z3 rectifier.
I have read that the diode would go from pin 5 to 6 band toward pin 6. Would that be true for both of these.

RE: Philco 49-909 - RodB - 05-02-2021

That's correct, and you might want to connect a dropping resistor between pin 6 of the lower rectifier and C104A to drop the B+ to 210V. Probably somewhere between 47 and 100 ohms, 1 watt. If you do this you'll reduce the heat to almost zero and that's a good thing!

RE: Philco 49-909 - Jimradio - 05-02-2021

Thanks RodB

RE: Philco 49-909 - Jimradio - 05-15-2021

Got it to work on AM had to repair the 1st AM IF transformer, now I found that the FM OSC trimmer (C400C) is flaky, just touching it, it will change. The tube that it is in is broke, don't know if it glass or plastic. Has anyone repaired one of these.    

RE: Philco 49-909 - OZ4 - 05-15-2021

I  am pretty sure it's glass. You might try some of the clay type epoxy. wrap it around  and stabilize it. Otherwise you need to replace it. It's a trimmer cap.

Make sure the epoxy does not have metal in it.

I would have it running to watch to see how much the epoxy affects the tuning.