Ron, hope you or some of the other members can help: I have a Philco 144 that had the 2d if transformer replaced with what appears to be a siilvertone item. Has continuity but I believe value is wrong. (correct part# is 32-1306). Besides the correct choke, are there other options out there to replace the "wrong" choke in the 144???? Color me hopeful.
Tom
Well, let's see...
Both the 44 and 144 used the same filter choke, Part No. 5930. 100 H, 10 mA, 2100 ohms DC resistance.
Options?
1. Find one in a junk 44 or 144. I'm not aware of any other Philco models that used that choke. Models 29 and 45 used a similar choke, Part No. 32-7018 (70 H, 10 mA, 2300 ohms DC resistance). This would probably work OK in the 44/144 circuit.
2. Use a substitute - Hammond makes chokes; none are exact replacements, but it appears HC-154E might be in the ballpark. The inductance in henrys is a lot lower then the original (20 H), but the DC resistance is close (1666 ohms). An increase in the value of the output filter capacitor (71) should take care of any increase in ripple.
3. Have Heyboer Transformer custom wind one for you.
4. Use a 2200 ohm resistor instead, increasing the size of the output filter (71) from 6 to 22 uF. The wattage of this resistor would need to be calculated.
I have a freshly refinished 144B cathedral cabinet, and a 44 chassis to put in it. The 44 will be converted to a 144 by changing a few components and adding a shadow meter. It is also missing its filter choke, and I'm thinking about going the resistor route. Philco used resistors instead of chokes in similar circuits in some of their 1937 models; the 37-650 comes to mind as an example.
Maybe I read your post wrong; are you asking about a filter choke or the 2nd IF transformer?
If you can find a junk Model 34, it will yield the IF transformers you want. I might even have a 2nd IF from one; I will look and see.
Any 460 kc IF that will fit should work okay; but for authenticity, you'll want one from a 34 or 144.
Thanks, Ron: yes, the 2d IF p/n 32-1306 is the one I need. Philco 34s and 44/144s are hard to come by in any condition. I have a 34 on display, interestingly it came in the flat face cabinet similar to the one the later Philco 44s came in, not the one similar to the one the 118B cathedral came in. I probably shouldnt mention this, as you may change your mind about harvesting the choke from your 34 chassis, but I have an extra 34 cabinet- the one like the 118B........
HOWEVER, I am interested in your transformer if you choose to part with it.
FYI: just took some pics of some of the collection, incl the "super" 116B and the 1934 16B cabinet with the 1935 16B chassis.
Color me tired of using the crappy mouse on this tiny notebook (dell latitude 430)
Tom
Oh yes, one more thing: I get my schematics from nostalgia air and your website. Problem I encounter is, like in this case, there are no resistance/inductance values listed for the chokes. Understand how you got the freq value,but where can I go to obtain similar info to what you had in your previous response? Sure would make solving problems like this 144 a lot easier......
Watch eBay for Philco Parts Catalogs. I obtained the info for the chokes from the 1935 Philco catalog. The info was not in the 1941 catalog, and I did not look in the 1946 catalog I have.
Old Philco parts catalogs come in handy for things like this.
You have an empty 34B cabinet, eh? Well, it just so happens that I have a pristine 34 chassis, so this could be something useful to me.
Don't worry, the pristine 34 chassis is
not the one I will be taking parts from. I have another 34 chassis that was radically changed around, then partially junked. I'm pretty sure it still has all three IF cans on it, though. I will try to check tomorrow or Saturday.
I for one would like to see the pictures of your Philcos...I'm sure others here would like to see them also.
I just got the cabinet at the show that was in Mesquite, TX last 21/22 nov. Its in pretty good shape, someone had "refinished" it and it needs toner applied to make the color correct. I'll send pics along with commentary. MUCH better than what the 44 was in when you started your refinish you detailed in the Phorum.
Hello, Ron: I emailed you a few pics of my collection last night. Let me know what you think.
TA Forbes Wrote:Oh yes, one more thing: I get my schematics from nostalgia air and your website. Problem I encounter is, like in this case, there are no resistance/inductance values listed for the chokes.......
Hi TA,
Obviously you are not aware of my website, The Philco Repair Bench.
I offer a photocopy service from
ORIGINAL Philco service bulletins for
models from 1928 up thru 1947. See the details on the Schematic Info
page on my site at the URL below to see what a typical packet comprises.
Much more comprehensive and detailed that a Riders scan, from other sources.
Happy Holidays,
Chuck
TA Forbes Wrote:I just got the cabinet at the show that was in Mesquite, TX last 21/22 nov. Its in pretty good shape, someone had "refinished" it and it needs toner applied to make the color correct. I'll send pics along with commentary. MUCH better than what the 44 was in when you started your refinish you detailed in the Phorum.
Yes, you're right...it is in MUCH better shape than that 44 I attempted to refinish recently.
Will send email about this.