Posts: 669
Threads: 145
Joined: Jun 2011
City: Elko,MN.
Looking to order a new Output transformer for my Philco 41-300x, and need to know the specs.
AES does not cross reference Philco part numbers with the transformers that they sell.
Would anyone know what info I would need to order the proper transformer for my radio?
Thanks,
murf
Posts: 16,230
Threads: 563
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Posts: 669
Threads: 145
Joined: Jun 2011
City: Elko,MN.
Thanks again Mike,
The thread said original P.N. was 32-7997, whereas mine is 32-7981.
Any notable difference?
Sounds like there is a bit of a modification to the wiring on the Hammond.
murf
Posts: 16,230
Threads: 563
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
All I know the Hammond 125 is pretty universal, you have the taps almost for any input to output impedance ratio.
Posts: 49
Threads: 0
Joined: Jul 2007
City: Denver CO
Part number 32-7997 is the recommended sub for a 32-7981 per the 1953 Philco parts catalog.
Posts: 4,808
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA
I think that a fairly generic push pull replacement output transformer, like AES and some others sell, should work, as long as the wattage rating is high enough. Type 42s, 6F6s, 6V6s, 6BQ5s and even 6L6s are pretty close in terms of plate load impedance, a 41, a 6K6, or 6AQ5 is not however.
Regards
Arran
Posts: 669
Threads: 145
Joined: Jun 2011
City: Elko,MN.
Need your opinion on new tranny.
Radio Daze suggested that the Hammond 125d is a little light.
Suggested a 125E instead.
Opinions?
murf
Posts: 16,230
Threads: 563
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
D is a 10 watt transformer. E is a 15 Watt one.
I think the D is just fine, but the difference being mere 3 bucks......Actually I would go by size, whichever fits better. Power is not that important in this case.
Posts: 16,230
Threads: 563
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Murf
There is no such thing as a weak OPT.
Short of keeping it on strong magnetic field and permanently saturating the core....though myself never heard of it.
Transformers do not get weak.
Posts: 669
Threads: 145
Joined: Jun 2011
City: Elko,MN.
Ok, great news.
Just thought I would ask the experts.
You have been a great help Mike.
You really know your stuff.
I'll keep poking around and see if I can find anything.
Have a great night.
Thanks, murf
Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
Just about any PP output transformer that was about the same size and weight and period would work just fine, lower voilume if mismatch, bu no fireworks. Use what you have or can scrounge.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
