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Philco mod. 20 - Printable Version

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Philco mod. 20 - Gary T. Lane - 09-26-2020

Hi all, I see a philco 32-9087-w speaker on ebay...Will that work in a philco mod. 20?

Gary

RE: Philco mod. 20 - Radioroslyn - 09-26-2020

Ok I give up what did it come out of??
Or is there a part # starting with a K or a S inked on it's frame?

The general answer is not so much. It needs to meet a few criteria. Low impedance output transformer to match the push pull triode output tubes (about 4000 ohm total). Needs to have a push pull output transformer. A speaker from a model 70 looks the same but has a single ended transformer. The field coil needs to have a fairly high dc resistance about 3100 ohms. Most of the later sets the field coils are lower around 1500 ohms.

RE: Philco mod. 20 - morzh - 09-26-2020

Not to even mention the size that seems to be very different.

Some H or G -type speakers will work, as they seem to work with P-P with 45 or 47 tubes. They even might have compatible plugs. Or so I think.

RE: Philco mod. 20 - radiohenry - 09-26-2020

I checked the auction the number 32.9087-w is not the speaker number but the field coin part number which I did not see listed but I will check again.
                                                Henry

RE: Philco mod. 20 - radiohenry - 09-26-2020

I rechecked and 32.9082 field coil was in a 1942  radio so I expect the 32.9087 to be later than that and guess that it may not work for a model 20 just based on age.
                               Henry

RE: Philco mod. 20 - morzh - 09-26-2020

Not base on age....but the early 30s speakers had voice coil from 0.15 Ohm to 1.1 Ohm or so.
The 40s speakers became more or less what they are today impedance-wise, so they would work and do work when an appropriate audio transformer is used.
I had no problem using 8 Ohm speaker in a 90 when checking reception when my original was being reconed.

RE: Philco mod. 20 - Gary T. Lane - 09-27-2020

Ok I tried to post a pix of the speaker I wanted to buy...
Yes, I have a PM speaker hooked up to an OP transformer
and it works fine...However when I saw this speaker I thought
wow! this is just what I wanted and only $14.00+ S&H. This radio
a Philco mod. 20 Deluxe is in great shape both cabinet and electronics.
Sorry I don't know what this speaker came out of Icon_sad

Thanks, Gary

RE: Philco mod. 20 - Radioroslyn - 09-27-2020

So is the issue with your original speaker with the cone or voice coil? If the opt and fc are good you could send it over the Sound Remedy in NJ. It's about $40 plus the trip. They can replace the cone, spider, and voice coil.

RE: Philco mod. 20 - Gary T. Lane - 09-27-2020

No, the old speaker is totally shot.
I tried to take it apart just for experience,
and I done more damage Icon_cry
Don't you think the one on epay will work?

Gary

RE: Philco mod. 20 - Radioroslyn - 09-27-2020

So is the speaker in question this one? https://www.ebay.com/itm/32-9087-W-SPEAKER-from-Vintage-Philco-Tube-Radio/293755212340?hash=item44652cd234:g:PD4AAOSwNU9fU9Nr
The seller didn't post the size. To me it looks like it could be a 10 1/2" (H) rather than an 8" (K or S) speaker. I would check on that. The cable looks to be a three wire job so if it is you'll need to change that and the opt too. The field coil is anybodies guess.

RE: Philco mod. 20 - Gary T. Lane - 09-27-2020

Yep, That's the one. He also said it wasn't tested either Icon_question
Guess I'll let this one pass by.

Thanks' for the help

Gary

RE: Philco mod. 20 - radiohenry - 09-28-2020

Funny,
 Nowhere in the Philco information is that field coil number listed. At least I can't find it. Yet it is certainly a Philco number.I have read a thread on another forum that is very confusing and attributes it to being in a Philco model 635  and also model 19 . Yet I do not see it listed as such.
                                     GL,
                                           Henry

RE: Philco mod. 20 - TA Forbes - 10-29-2020

For the more adventurous out there.... re-coning a speaker from a model 20, 21, 70, 90, etc.... makes ALL the difference in how good they sound. 

My model 90B with the PP 47s sounded like an entirely different set when I did this.

RE: Philco mod. 20 - morzh - 10-29-2020

Tom, you rascal, where have you been?

RE: Philco mod. 20 - MrFixr55 - 11-26-2020

There is a Model 20 speaker being advertised on ePay right now as we speak.  Seller is "oldtvsandtoys", 2 days left, no bidders yet, starting bid is about $20.00  Disclaimer:  I do not know this eBay seller and have no financial gain from providing this info.  I apologize to the Moderators if this post breaks any rules.

I am working on a Model 20 right now.  The case is a basket case and I am still working on the chassis (Yep, the coils!!)  I'm using a modern 8" 8 Ohm speaker, a 3K 10 watt resistor and 40 / 40 uF capacitors.  Not original but works well before another RF Coil opened, but still receives my talking house transmitter from the detector grid.  The modern speaker is low end but still sounds much better than an original condition Model 20 that I repaired.  I may put in an Aux input and audio volume control between the detector and 1st AF to hear how good the Push Pull 71A Amplifier sounds.  This radio is not good enough and complete enough for a restoration to original condition right now (Although the 3 24as and 27 are Philco branded globes.  The 71As and 80 are RCA Globes.  I got the chassis and case separately, the chassis without tubes.