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 WHat did I get for $2.00?

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Join date : 2010-11-23

PostSubject: WHat did I get for $2.00?   June 3rd 2014, 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?

Whole View

Tube Number


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Cliff Jones
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Join date : 2010-11-22

PostSubject: Re: WHat did I get for $2.00?   October 8th 2014, 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. registered trademark (number 0585950, 23 February 1954) of Consolidated Vultee Aircraft Corporation (Convair) for its shaped electron beam cathode ray tube. 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 Hughes Aircraft Corporation 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.

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

Here's a link   Click Here for Acorn tubes

I'm a Science Thinker, Radio Tinkerer, and all around good guy. Just ask Me!
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