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 WHat did I get for $2.00?

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ve1arn
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Join date : 2010-11-23

PostSubject: WHat did I get for $2.00?   2014-06-03, 12:08 pm

Local ham radio flea market on Saturday. Picked up some really important stuff I needed. <grin>

In a box of assorted goodies was 4 NIB JRC955 Acorn tubes and this tube in the photos. Any ideas as to what its purpose was?

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Cliff Jones
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PostSubject: Re: WHat did I get for $2.00?   2014-10-08, 4:44 pm

I Finally found one!!! 

So This is a:
RCA 1698 Charactron Monoscope TV Character Display Tube

This tube is a pattern monoscope - it was used to generate numbers and geometric shapes.

Cyclopedia= "Charactron was a U.S. [You must be registered and logged in to see this link.] (number 0585950, 23 February 1954) of Consolidated Vultee Aircraft Corporation (Convair) for its shaped electron beam [You must be registered and logged in to see this link.]. Charactron CRTs performed functions of both a display device and a read-only memory storing multiple characters and fonts. The similar Typotron was a U.S. registered trademark (23 November 1953) of [You must be registered and logged in to see this link.] for its type of shaped electron beam storage tube with a direct-view bistable storage screen.
The Charactron CRT used an electron beam to flood a specially patterned perforated anode that contained the stencil patterns for each of the characters that it could form. The first deflection positioning of the electron beam steered the beam to pass through one of the (typically 64 or 116) characters and symbols that could be formed. The beam, which then had the cross-section of the desired character, was re-centered along the axis of the tube and deflected to the desired position of the screen for display. Alternately, as in the accompanying image, the entire matrix was filled with the electron beam then deflected through a selection aperture to isolate one character.
The term Charactron is sometimes mistakenly applied to another type of CRT properly called a monoscope which generates an electrical signal by scanning an electron beam of uniform cross section across a printed pattern on an internal target electrode.




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You will find this a project site for those acorn tubes. High Freq triodes with range to around 400MHz.
Hmmm wonder if they could be used for substituting the 1L6 Pentode with a Triode? Suspect

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