[Milsurplus] Re: [Boatanchors] When Were Metal Case Tubes First Produced?

[D C *Mac* Macdonald]

The RCA Model 10K (150 kC/sec - 60 MC/sec) console 
radio that my dad bought in Oklahoma City somewhere 
around 1936 or 1937 had lots of metal tubes, including 
6L6 push-pull output tubes driving a 12" electro-magnet 
speaker with resonance tubes down in the bottom of 
the big (close to 4' tall cabinet). 
 
73 - Mac, K2GKK/5 
Oklahoma City, OK 
 
 
 
__________________________________ 
> Date: Fri, 23 May 2008 17:53:11 -0400 
> From: jfor at quik.com 
> To: jmfranke at cox.net 
> CC: boatanchors at mailman.qth.net; BOATANCHORS at LISTSERV.TEMPE.GOV; milsurplus at mailman.qth.net 
> Subject: [Milsurplus] Re: [Boatanchors] When Were Metal Case Tubes First Produced? 
> 
> Thanks very much. That's a few years earlier than I thought. 
> -John 
> 
> ============== 
> 
> John Franke wrote: 
> 
>> On April 1, 1935, GE and RCA unveiled their revolutionary all-metal 
>> receiving tube at the IRE show in New York City. By the end of June, 25 
>> companies had joined the bandwagon. The initial release was nine tube 
>> types: 5Z4, 6A8, 6C5, 6F5, 6F6, 6J7, 6K7, 6L7, and 6H6. 
>> This is from "History and Development of the All-Metal Radio Tube," Bro. 
>> Patrick Dowd, W2GK, AWA, Vol. 16, No. 4, March 1976, and Vol. 17, No. 1, 
>> June 1976. 
>> 
>> John WA4WDL