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 Post subject: Subminiature tube history
PostPosted: Sep Sat 25, 2021 12:01 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3939
Location: Boston, Massachusetts
Very interesting article

https://sites.google.com/site/johnengsd ... ture-tubes

Microtubes: https://www.rfcafe.com/references/radio ... r-1947.htm

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Last edited by mrx on Sep Sat 25, 2021 6:22 pm, edited 1 time in total.

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 Post subject: Re: Subminiature tube history
PostPosted: Sep Sat 25, 2021 3:47 pm 
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Location: Redding, CA
Nothing on Microtubes or Hytron subminiatures?!

Norman

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 Post subject: Re: Subminiature tube history
PostPosted: Sep Sat 25, 2021 6:25 pm 
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Braithwaite wrote:
Nothing on Microtubes or Hytron subminiatures?!

Norman


Were the microtubes available commercially or just for the military?

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 Post subject: Re: Subminiature tube history
PostPosted: Sep Mon 27, 2021 4:37 pm 
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Location: Redding, CA
Yes, they were advertised to the public starting in 1941. Microtubes was allowed to continue production during WWII because the tubes were necessary for medical devices (hearing aids). The company was absorbed by Zenith during 1943. I have a Zenith Microtubes brochure hand marked "not for sale during the war." I presume that note was regarding sales to the public other than for replacement in hearing aids made by Zenith.

Attachment:
Microtubes_20210927.jpg
Microtubes_20210927.jpg [ 120.78 KiB | Viewed 519 times ]


Norman

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 Post subject: Re: Subminiature tube history
PostPosted: Sep Mon 27, 2021 10:48 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 39577
Location: SoCal, 91387
I have a few portable sets, each using four subminiature tubes, two sets using a combination of Acorn and subminiature, and several using three subminiature tubes and two Transistors.

4 tube sets; Emerson 747, Koyo Parrot, Tom Thumb 528, & Hoffman Nugget.

Acorn and subminiature; Motorola 45P2, & Silvertone 4212.

Hybrid, three subminiature tubes for converter and IF, two Transistors for audio; Emerson 838 & 856 & Tom Thumb TT 600.


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Emerson 747 knob.jpg
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Koyo rear.JPG
Koyo rear.JPG [ 308.19 KiB | Viewed 502 times ]

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Last edited by fifties on Sep Tue 28, 2021 4:45 am, edited 1 time in total.
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 Post subject: Re: Subminiature tube history
PostPosted: Sep Tue 28, 2021 12:35 am 
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Location: Redding, CA
Microtubes was a brand in the business of making subminiatures tubes. I believe the subminiatures tubes employed in early 1950s portable radios were made by Raytheon and perhaps CBS.

Norman

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 Post subject: Re: Subminiature tube history
PostPosted: Sep Tue 28, 2021 4:53 am 
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I didn't know micro was a specific brand name, as I've never seen that name in portable radios. Yes, Raytheon, Sylvania, Motorola, GE, RCA, Tung-Sol, etc., were all makers.

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 Post subject: Re: Subminiature tube history
PostPosted: Oct Sat 16, 2021 4:13 am 
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I have a few pics of a Zenith hearing aid, year of sale, 1946.
Neither here nor there, just saying, exciting times for consumers.
This model has batteries in a belt pack, not shown.


Attachments:
Zenith Hearing aid A2A.jpg
Zenith Hearing aid A2A.jpg [ 216.77 KiB | Viewed 312 times ]

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 Post subject: Re: Subminiature tube history
PostPosted: Oct Sat 16, 2021 1:36 pm 
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Location: Liberty, Missouri
I have a number of the sub mini's as shown in "fifies" post, and I'll send anyone interested in playing with one, a freebee. Send me a PM.

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