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#1
11-14-2008, 07:37 AM
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8JP4 question
I see a number of CRT testers that will test the 8JP4 and some sites that sell 8JP4 test adapters. Yet I don't know of any sets that use this CRT and I can't find any specifications for it.
Is this the same as a 7JP4 but only 8" in diameter? John Y. 
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#2
11-14-2008, 11:27 AM
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My Motorola 9VT1 uses the 8" equivalent of the 7JP4 which is the 8BP4. Electrically it is the same tube only with an 8" screen. I've never seen an 8JP4.
__________________
Just look at those channels whiz on by. - Fred Sanford
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#3
11-14-2008, 11:39 AM
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I don't recognize the 8JP4... I'm out of town, or I'd consult the RCA Receiving Tube Manual. Compucat is correct about the 8" Motorola electrostatic sets using the 8BP4.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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#4
11-14-2008, 02:16 PM
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I did look in the RCA manual, and an old Sylvania CRT manual and it's not listed there.
It's on the chart of the B&K 467 CRT tester and a test adapter is listed at oldradioparts.com for it. http://www.bkprecision.com/support/d...etup_Chart.pdf I don't need to know. It's just to satisfy my curiousity. John
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#5
11-14-2008, 03:14 PM
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Since an 8BP4 is essentially an oversize 7JP4, it may be that references to an 8JP4 are merely "typos by suggestion". I can't tell you how many times on various skizzies and tube location charts I've seen the 6BC5 referred to as 6CB5 thanks no doubt to associating it with 6CB6.
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tvontheporch.com
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