Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco Models with Tapped or Split Field Coils
#1

I am in the midst of upgrading and expanding my Universal Shop Speaker and Dummy Field Coil. I am getting ready to add a second dummy field coil to handle sets with tapped or split field coils. Such sets are rather uncommon. Rather than spend so much time with schematics that I'll need new eyeglasses I would like to ask you to name any Philco models that you know of which have tapped or split field coils. I need to see what range of resistances I should expect my second dummy field coil to have to handle. One benefit of this upgrade is that I will also be able to handle single field coil sets with high resistance (over 1700 ohms) coils.

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/
#2

The Atwater Kent Type L1 and L2 chassis has split fields at 560 ohms and 3000 ohms. The L2 300 ohm is also tapped. In addition the speaker has a third field coil not involved with ps filtering. I believe the Philco 511-514 series uses two filter chokes in the power supply; 275 and 1900 ohms.
#3

The Philco 511 Series does not use a field coil speaker - they use a magnetic speaker.

--
Ron Ramirez
Ferdinand IN
#4

Right Ron, in the 511 series the 2 chokes are in the power supply.
#5

Dale, several years ago I fixed a Radiotrope floor model for a friend. It is made by U.S. Radio & Television Corp. I understand other brands such as US Apex, Gloritone and Radiotrope, were made by them. In the radio I serviced, it had a split field coil with 3600/3000 ohm sections. Hope this helps. Your Universal Shop Speaker looks like a cool project!

Ron

Bendix 0626.      RCA 8BX5.   RCA T64
Philco 41-250.    Philco49-500
GE 201.             Philco 39-25
Motorola 61X13. Philco 46-42        Crosley 52TQ
Philco 37-116.    Philco 70
AK 35                Philco 46-350
Philco 620B.       Zenith Transoceanic B-600
Philco 60B.         Majestic 50
Philco 52-944.    AK 84
#6

RodB Wrote:Right Ron, in the 511 series the 2 chokes are in the power supply.

The OP is asking about field coils.

Dale, I am not aware of any prewar Philco that uses a tapped or split field coil. I'm not saying there aren't any; there might be one or two that I can't remember/not aware of.

--
Ron Ramirez
Ferdinand IN
#7

Ron Ramirez Wrote:  Dale, I am not aware of any prewar Philco that uses a tapped or split field coil. I'm not saying there aren't any; there might be one or two that I can't remember/not aware of.
Ron - Thank you very much. You have seen more Philco models than anyone else I know of, so that is about as good as it gets. As far as post WWII sets go I don't generally work with those - the newest Philco in my collection is my 42-355. It is also my only prewar FM set. I am fortunate that I own instruments to work on its FM sections (SG-3U AN/URM-70 FM signal generator and HP Model 675A sweeping signal generator), and I have worked on many FM receivers up to 950 MHz over 40+ years, mostly specialized broadcast receivers (STL and remote broadcast) with a small number of consumer FM radios (of which my 42-355 is my favorite).

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/




Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
Philco 91 Speaker Replacement
The spider is glued on the cone and so is the voice coil. I think you can use a cotton swab dipped in acetone and carefu...RodB — 02:42 PM
Restoring Philco 37-604C
Yes I saw that. If I knew, I'd probably try to arrange for getting it myself. But I have just got one. Which does not m...morzh — 01:44 PM
Philco 38-2 Automatic Tuning
When you push the lever, you are supposed to rotate the disk to the desired station. Then the magnetic tuning will acqu...morzh — 01:42 PM
Philco 38-2 Automatic Tuning
I figure out the muting from another picture that helped. Now I need to know how the automatic tuning works. When I push...dconant — 12:11 PM
Philco 91 Speaker Replacement
How would I go about removing the spider from the cone?dconant — 12:04 PM
Philco 38-2 Automatic Tuning
Hello, I am having trouble getting my automatic tuning to stay unmuted. If I play with the tuning handle I can get it to...dconant — 10:51 AM
Does anyone make photofinish replacements?
Here’s the link to the DIY photofinish section of our site: klondike98 — 09:46 AM
Delco car radio Peko vibrator converstion issues
Hi Richard, Thx for posting the schematic.  As I remember as a kid, these were great performers for the time, likely...MrFixr55 — 08:56 AM
Delco car radio Peko vibrator converstion issues
hello mr Fixr, The Electro  Powersupply that I am powering the radio with has a huge choke plus a 10,000ufd electrolyti...radiorich — 10:58 PM
Delco car radio Peko vibrator converstion issues
How about putting a choke in the power supply? The big cap was likely an attempt to stabilize the DC. Kids who cre...MrFixr55 — 09:19 PM

[-]
Who's Online
There are currently no members online.

>