Quote:
Originally Posted by Bobby Dip
I might be willing to buy a complete set to obtain a 8AP4, if the price is right.
Bob D.
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Bob,
I'd like to know how you determined this was an 8AP4.
That is one of the last CRT's I would have guessed.
If you look at the Arvin pictures you will see what a metal CRT anode collector looks like. Metal CRT's are prone to leakage with extreme temperature shifts like one would find in a car with the changing seasons.
Your picture on ETF showing the anode, looks to me like a universal anode post (like Dumont used) or cavity (like most others used) connector, that has the cavity part missing. (It has been 50+ years since I looked at one of these, but the two parts were usually held together with a screw.) In the late 1940's they were available as universal replacement parts, because some CRT's especially scopes, came with either gender connector.
It would help if you could post a larger image of the connector. Also, of the backside where the power comes in to this set. I do not see any thing that looks like a vibrator or a dynamotor and in the 1940's & early 1950's nothing else could generate HV from low voltage DC until the power transister came out.
I assume that you know that the metal anode will run at about 7,000 volts and requires an insulator between it and the metal chassis.
The bottom of the CRT strap looks to me like a strap for a glass CRT that is missing the felt or rubber pads.
Until you can prove the set is complete enough to restore, I'd still recommend that you stick to the inexpensive test tube.
James.