Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Nov Thu 14, 2019 5:24 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 10 posts ] 
Author Message
 Post subject: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 3:22 am 
Member
User avatar

Joined: Aug Tue 28, 2018 9:22 pm
Posts: 1224
Location: Sanford Fla 32771
I have two schematics for the same radio (AtwaterKent 33), one list 201A and the other 301A tubes. I understand they are interchangeable but there must be some difference or why the different numbers ?.

_________________
Paul of Florida (Click below for my collection)
https://paulsironhorse.smugmug.com/


Last edited by pauls.ironhorse on Aug Fri 09, 2019 4:29 am, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 3:53 am 
Member
User avatar

Joined: Sep Mon 18, 2017 2:23 am
Posts: 4064
Location: Plymouth, MI
A 301A is a Cunningham brand 01A tube, the number "3" identifies the tube as Cunningham and the "X' signifies a base with long pins. The 201A tube is an RCA brand 01A tube, the number "2" identifies the tube as RCA and again the "X" signifies a base with long pins. The tubes are interchangeable.

_________________
Dan

Museum Curator
https://roaringtwentiesantiqueradiomuseum.com/


Top
 Profile  
 
 Post subject: Re: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 3:58 am 
Member
User avatar

Joined: Aug Tue 28, 2018 9:22 pm
Posts: 1224
Location: Sanford Fla 32771
Thanks for the info, I have been using them as interchangeable but I appreciate the clarification..

_________________
Paul of Florida (Click below for my collection)
https://paulsironhorse.smugmug.com/


Top
 Profile  
 
 Post subject: Re: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 1:10 pm 
Member
User avatar

Joined: Jun Wed 08, 2011 2:33 am
Posts: 9419
Location: Ohio 45177
Just where they were marketed. I thought I read that it was RCA in the east and C' ham in the western territory of distribution?

_________________
Reddy Kilowatt says; You smell smoke? Sorry about that!


Top
 Profile  
 
 Post subject: Re: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 3:15 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 1339
Location: Orlando, FL, USA
It is even more basic, not only are the RCA and Cunningham tubes interchangeable, they are, in fact, the same tubes.

Elmer Cunningham was a West Coast independent who made an agreement with RCA ca 1920 to stop selling his own tubes and become a distributor for RCA. Both brands were sold nationwide. Part of Cunningham's special deal was that he got the tubes marked with his brand.

Most people do not realize also that RCA made no tubes or radios until 1930. The "Radio Corporation" was set up to combine the patent pools of American Marconi, Westinghouse, General Electric and Wireless Specialty Apparatus. The Radio Corporation was simply a distributor of merchandise and was also set up to control foreign commercial radio traffic. At the time, before consumer radio, RCA thought the commercial radio message business was going to be the big money maker.

So, until 1930, when thew Feds broke up the radio group, all of RCA's tubes were made by GE and Westinghouse. The radios were mostly made by GE and Westinghouse, with a few made by WSA.

in 1926, RCA had gotten a partial interest in Cunningham, and they acquired the rest of it in 1930. When the Radiotron division was formed in 1930, Elmer Cunningham became its first president.


Top
 Profile  
 
 Post subject: Re: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 3:41 pm 
Member
User avatar

Joined: Aug Tue 28, 2018 9:22 pm
Posts: 1224
Location: Sanford Fla 32771
Thanks Jim, interesting history.

_________________
Paul of Florida (Click below for my collection)
https://paulsironhorse.smugmug.com/


Top
 Profile  
 
 Post subject: Re: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 4:53 pm 
Member
User avatar

Joined: Aug Tue 28, 2018 9:22 pm
Posts: 1224
Location: Sanford Fla 32771
While scanning some radios I found this tag, shows how closely connected the big three, RCA, GE, Westinghouse, yet the radio is made by a forth, the big three held the patents...


Attachments:
zzzzz8aug09_2019.jpg
zzzzz8aug09_2019.jpg [ 206.87 KiB | Viewed 469 times ]

_________________
Paul of Florida (Click below for my collection)
https://paulsironhorse.smugmug.com/
Top
 Profile  
 
 Post subject: Re: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 10:45 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 9238
Location: Beaver Falls, PA. USA
Another big patent holder from the old days was AT&T / Western Electric. You'll find their patent numbers on vintage broadcast and theatre sound equipment. Back in those days, you didn't dare to into the radio or sound equipment business without paying royalties to the "big guys", as all those patents were still in force.

_________________
Tim KA3JRT


Top
 Profile  
 
 Post subject: Re: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 10:57 pm 
Member
User avatar

Joined: Sep Mon 18, 2017 2:23 am
Posts: 4064
Location: Plymouth, MI
pauls.ironhorse wrote:
While scanning some radios I found this tag, shows how closely connected the big three, RCA, GE, Westinghouse, yet the radio is made by a forth, the big three held the patents...


You'll see early tubes with two or three brand names on them. :shock:

_________________
Dan

Museum Curator
https://roaringtwentiesantiqueradiomuseum.com/


Top
 Profile  
 
 Post subject: Re: CX201A verses CX301A
PostPosted: Aug Fri 09, 2019 11:56 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 4836
Location: Eschew Obfuscation Virginia 23005
Jim Cross wrote:
It is even more basic, not only are the RCA and Cunningham tubes interchangeable, they are, in fact, the same tubes.

Elmer Cunningham was a West Coast independent who made an agreement with RCA ca 1920 to stop selling his own tubes and become a distributor for RCA. Both brands were sold nationwide. Part of Cunningham's special deal was that he got the tubes marked with his brand.

Most people do not realize also that RCA made no tubes or radios until 1930. The "Radio Corporation" was set up to combine the patent pools of American Marconi, Westinghouse, General Electric and Wireless Specialty Apparatus. The Radio Corporation was simply a distributor of merchandise and was also set up to control foreign commercial radio traffic. At the time, before consumer radio, RCA thought the commercial radio message business was going to be the big money maker.

So, until 1930, when thew Feds broke up the radio group, all of RCA's tubes were made by GE and Westinghouse. The radios were mostly made by GE and Westinghouse, with a few made by WSA.

in 1926, RCA had gotten a partial interest in Cunningham, and they acquired the rest of it in 1930. When the Radiotron division was formed in 1930, Elmer Cunningham became its first president.

+1


Top
 Profile  
 
Post New Topic Post Reply  [ 10 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 4 guests



Search for:
Jump to:  




























Privacy Policy :: Powered by phpBB