I just got and old radio from a friend. I have only found one tag on chases which says, Licensed only for Radio amateur Experimental and Broadcast reception under patents of R.C.A. and associated companies. The manufacture or sale of this apparatus does not imply any license under any patent relating to the structure or manufacture of radio tubes.
W. M. Co. No. 71654
Can anyone tell me anything about it?

The tag that you described is a standard notice that most radios carried to indicate that their manufacturers had purchased license rights for the use of patented technology. "W M " could be one of a number of manufacturers. If you can post photos of the set (inside and outside) along with a list of the tubes that it uses, that info could help someone here identify it.

"RCA" as referred to in the license notice was at first a consortium of several early radio equipment makers that was set up to foster the domestic radio industry in the USA. Soon RCA became a brand in its own right, merging with Victor, another radio/phonograph company in the late 1920s to become the well- known "RCA Victor" company.

:The tag that you described is a standard notice that most radios carried to indicate that their manufacturers had purchased license rights for the use of patented technology. "W M " could be one of a number of manufacturers. If you can post photos of the set (inside and outside) along with a list of the tubes that it uses, that info could help someone here identify it.
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:"RCA" as referred to in the license notice was at first a consortium of several early radio equipment makers that was set up to foster the domestic radio industry in the USA. Soon RCA became a brand in its own right, merging with Victor, another radio/phonograph company in the late 1920s to become the well- known "RCA Victor" company.

That set was built while RCA still had patent rights to the superhetrodyne circuit. (spelling?...I just woke up). All early superhets had to give RCA credit for legal reasons.
Lewis
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RCA bought up the superheterodyne patent exclusive rights from Edwin Armstrong, the circuit's inventor. This allowed it to make its own superhet models and also to license the circuit to whoever plunked down the cash to do so. The re-licensing fee was probably quite high, since many radio makers eschewed superhets in favor of TRF sets (which also used patented technology, but the licenses for which were apparently more reasonable). The superhet patents expired in the early 1930s, at which time the superhet market exploded.

Radio manufacturing was a growth industry right after WW1, with hundreds of makers entering the marketplace. The patent owners jealously guarded their intellectual property rights and aggressively went after infringers. However, the notice affixed to radio sets was intended to make John Q. Consumer aware that merely purchasing a set conferred no legal rights to copying and re-selling the technology in the radio- he was only granted "usage rights" to the equipment he owned.

:The tag that you described is a standard notice that most radios carried to indicate that their manufacturers had purchased license rights for the use of patented technology. "W M " could be one of a number of manufacturers. If you can post photos of the set (inside and outside) along with a list of the tubes that it uses, that info could help someone here identify it.
:
:"RCA" as referred to in the license notice was at first a consortium of several early radio equipment makers that was set up to foster the domestic radio industry in the USA. Soon RCA became a brand in its own right, merging with Victor, another radio/phonograph company in the late 1920s to become the well- known "RCA Victor" company.
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I took some pictures but I am unsure how to post on this web forum. The tubes from the set are KEN-RAD and the numbers are as follows: #34 (two of those) #30 #19 #1C6 #1B5 and what appears to be an empty tube socket. Is there an email address I can send pictures to?

See if any of these match or if you could use any of these for a similar schematic:

* Allied (Knight) A81
* Andrea 162
* Atwater Kent 237Q, 467Q, 2370, or 4670
* Crosley B-495, B-599, B-699, or 646
* Electrical Research (Erla, Sentinel) 33B or 38B
* Fada 162C or 162T
* Fairbanks Morse 6416 or 6445B
* Federated Purchasers (Acratone) 169B or 169D
* Gamble Skogmo (Coronado) 680, 680B, 780, or 780B
* Kadette 72
* Lafayette C17 or D28
* Pacific 81A
* Pilot X73 or X75
* Radolek 11935
* Sears (Silvertone) 1992X
* Sentinel (United Air Cleaner) 38B or 3311
* Setchell-Carlson 52
* Simplex P-Battery
* Spiegel Aircastle 142, 154, 725, 6602, or 6650
* Warwick 723 or 725

Some of these models list the missing tube as another 34, others a 6Z5.

:I just got and old radio from a friend. I have only found one tag on chases which says, Licensed only for Radio amateur Experimental and Broadcast reception under patents of R.C.A. and associated companies. The manufacture or sale of this apparatus does not imply any license under any patent relating to the structure or manufacture of radio tubes.
:W. M. Co. No. 71654
:Can anyone tell me anything about it?
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