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Old 03-16-2017, 11:28 AM
tvdude1 tvdude1 is offline
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5azp4 crt

I have a NOS 5AZP4 want to sell it but not sure what set they were used in maybe later projection sets? and what to ask for it.
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Old 03-16-2017, 11:41 AM
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PM sent.
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Old 03-16-2017, 12:17 PM
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If you don't make a deal with Ben, someone on the ETF site posted a want ad for one.

http://www.earlytelevision.org/class...ts_wanted.html
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Old 03-16-2017, 04:37 PM
tvdude1 tvdude1 is offline
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Thanks Tim he did buy it.
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Old 03-17-2017, 08:59 AM
tvdude1 tvdude1 is offline
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Does this crt work in early Rca projection set without any modification? Has anyone tried it?
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Old 03-17-2017, 12:32 PM
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You have to mess with the HV lead; the 5AZP4 has it permanently attached to the tube, the 5TP4 has it free. I've also heard that running one at less than ~35 kV won't give brightness on the same level as the 5TP4, but I've yet to confirm or deny this. It was intended for 40 kV on the ultor.

So in short, NO, you must modify a normal RCA PTU-1 projection set in order to use the 5AZP4.
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Old 03-17-2017, 01:09 PM
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Electronic M Electronic M is offline
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Maybe a SS HV rect tube, add some doorknobs to add another stage to the HV multiplier and a 6BK4 to regulate the HV and you could get stable 40KV.
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Old 03-17-2017, 01:23 PM
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I actually have the correct RCA projection unit for this set. TSL-86, if my memory of the model number is correct. Throws an 8 by 6 picture. My 5AZP4 is dead

I'd give my eye teeth for one of the big theater projectors with the 7 inch tube. Runs around 50-75 kV if I remember correctly
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Old 03-17-2017, 02:28 PM
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According to the spec sheet, this CRT requires air blowing directly on the face to dissipate the heat when run with the average anode power over 9W.

https://frank.pocnet.net/sheets/049/5/5AZP4.pdf
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