RCA shortwave radio Model 40X ?
Posts: 6
Threads: 2
Joined: Jan 2020
City: Venus
State, Province, Country: TX
Howdy folks,
I don't post here as I enjoy reading and learning from you all and don't want to be a pest asking dumb questions. Having said that today I came across an older radio without brand name up front just a Model 40X in the back. There's also a smaller label on the back saying "Licensed only for radio amateur under experimental and broadcast reception" Patents under Radio Corporation of America HAZELTINE AND LATOUR AND AFFILIATED COMPANIES
I assume radio was produced by RCA for ham radio operators but can find absolutely no info about it on line. Can anyone here help me find some info about it? Thank you in advance.
My first experience working on the radio was shocking  but I am getting used to it.
Posts: 161
Threads: 8
Joined: Apr 2023
City: Roanoke
State, Province, Country: Virginia
The patent licensing notice has no relationship to who manufactured the radio. I don't see a model 40X in the Universal Schematic Locator or in the CD-ROM edition of Bunis. It isn't one of the 1939 RCA series which begins "40X" followed by two digits.
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/
Posts: 992
Threads: 40
Joined: Feb 2015
City: Roseville, MN
Dale is correct. RCA owned the patent for the superhet design and licensed the design to any company with the right compensation. This notice had to be attached to every radio under the license agreement. Sarnoff was not a hospitable person.
This appears to be a post-war model as pre-war radios with phono jacks were rare.
Posts: 7,286
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
Is this a set that you saw or a project? If you have it there is a way to look up the tube lineup and try to figure it out that way.
I'm a little iffy on the 1st IF trans and the pushbutton assby but I'm a pessimism.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 6
Threads: 2
Joined: Jan 2020
City: Venus
State, Province, Country: TX
Hi,
I do have the receiver at home on the workbench. Didn't want to mess with it too much without prints/schematic but I guess now I'm gonna have to. Additional detail radio came from a military gentleman from Hawaii who was a radio collector.
My first experience working on the radio was shocking but I am getting used to it.
Posts: 7,286
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
Your chassis is a bit different in that it uses both standard base and octal base tubes. I would think that it would be a pre war set but we'll see. Here's something to try: https://grillecloth.com/sylvania/tubelist.php
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
(This post was last modified: 05-21-2024, 04:21 PM by Radioroslyn.)
Posts: 1,191
Threads: 25
Joined: Jan 2014
City: Wellborn Florida
Thinking about your set maybe it started life as a kit. Looking at the push buttons and the screws on each side. Found a set years ago at a flea market the only markings personal radio. Had wood blocks to align the parts. link to my post. David https://philcoradio.com/phorum/showthrea...#pid151851
Posts: 4,703
Threads: 51
Joined: Sep 2008
City: Sandwick, BC, CA
For a start, the layout, and chassis design does not look like an RCA model, also RCA wasn't really in the habit of mixing tube types with different bases. Given the electric pushbuttons that would make the set 1938 or newer, more likely 1939-40 or newer, which if it were an RCA set would mean it would have an RCA jack and not a pair of pin jacks, and more then likely included a magic eye tube. I'm not sure when the RCA jack debut but it may have been around 1937, the 1935 and earlier models had a pair of screw terminals, none used pin jacks like an old set of headphones.
I do not think that this was a kit, if it were then why would it have "Tested by #11" stamped on the back apron? It looks like something made by one of the Chicago independents, Belmont, Continental Radio and Television (Admiral), Sentinel (though the chassis doesn't like like one of theirs). It's not a Crosley, I don't think it's an Arvin, or a Detrola. It could have been made by Colonial, which was in New York state, they used to make stuff for Sears.
Regards
Arran
Posts: 1,191
Threads: 25
Joined: Jan 2014
City: Wellborn Florida
The push buttons just do not add up. Looking from the back of the set me thinks not part of the set when it left the factory. David
Posts: 992
Threads: 40
Joined: Feb 2015
City: Roseville, MN
David, I think you're right. When leaving the factory it would have a bezel around the buttons. It's a strange one.
Posts: 1,598
Threads: 100
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Rob,
I think the bezel around the buttons is just missing because you can see where the wood is a different color where bezel was covering the wood !
Sincerely Richard
Posts: 1,191
Threads: 25
Joined: Jan 2014
City: Wellborn Florida
Looking at the push buttons and the knobs just do not match to my old eyes. David
Posts: 461
Threads: 31
Joined: Sep 2009
City: Lapeer
State, Province, Country: MI
It would be helpful to know the tube line-up.
Joe
Matthew 16:26 "For what does it profit a man if he gain the whole world, yet lose his own soul?"
Users browsing this thread: 3 Guest(s)
|
|
Recent Posts
|
|
Philco 42-1008 conversion kit
|
| I read about a kit to convert the variable speed changer in the Philco 42-1008 into a single speed unit. That would rem...alangard — 09:30 PM |
|
HiFi (Chifi) tube amp build - but my own design.
|
| Tim
Well...a chassis is metal. Magnetic or not, it does not matter.
A transformer has some hum to it. It is natural....morzh — 08:40 PM |
|
Hickok AC51 tube tester
|
| I thought the 83 tube was bad because it looked white but it tests strong. Blue gassy though. I checked the fuse, it was...martinj — 08:37 PM |
|
Shadow Meter Bulb
|
| Ross
I am not sure what current limiting effect the incandescent provides.
They are two different parts of the sch...morzh — 08:31 PM |
|
12' Philco
|
| Bob
Thanks for that photo.
I have been looking for it, and I cannot find anythinmg on the web.
I forgot it was here...morzh — 08:29 PM |
|
Shadow Meter Bulb
|
| I think after all has been said, I will use the same bulb that is specified for the dial pilot light which is a #55.
I ...georgetownjohn — 07:31 PM |
|
12' Philco
|
| There was also this Philco!
klondike98 — 07:25 PM |
|
HiFi (Chifi) tube amp build - but my own design.
|
| I expected a challenge and this is just part of it. But, it's also supposed to be fun, entertaining, informative and enj...TV MAN — 07:12 PM |
|
Shadow Meter Bulb
|
| Butting in here with a question. Since the shadow meter is connected directly to the 1st and 2nd I.F.'s wouldn't the met...RossH — 06:43 PM |
|
HiFi (Chifi) tube amp build - but my own design.
|
| Mike, Tim; you are about to enter the twilight zone. Doo doo doo doo, doo doo doo doo
This is something alright. I'm go...RodB — 06:26 PM |
|
Who's Online
|
There are currently 5075 online users. [Complete List]
» 1 Member(s) | 5074 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
