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#1
11-20-2016, 12:29 AM
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Tech-Master NIB TV Kit #5516
Guys,
I won this 1955 TV kit NIB at an auction today. It does not come with a CRT. The parts haven't even been removed from the carton! I talked to the seller and he said that he removed the instruction sheet to see what CRT it uses, but he didn't have that type. Otherwise completely unmolested. Because he already looked at the instruction sheet, I pulled them from the envelope. What a find! Of course the real question is should I keep it this way or build it? Photobucket isn't cooperating so no pictures right now. I did post some pictures over on ARF. 
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#2
11-20-2016, 10:40 AM
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I wouldn't have any reservations building that. Looks like any 70 degree electrostatic focus CRT could work, but I'm guessing that chassis is set up for a 17" tube, like a 17HP4.
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#3
11-20-2016, 11:39 AM
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Some pictures.
      
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#4
11-20-2016, 11:41 AM
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Kevin,
Thanks for the reply. I needed that info for a CRT! Where did you get it? Was it a page from an Allied Catalog or such?
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#5
11-20-2016, 11:49 AM
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I also think it uses a magnetic focused CRT. There is a fly-back transformer and the schematic shows a HV lead going to a 2nd anode on the CRT.
I think the ad has a typo.
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| Audiokarma |
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#6
11-20-2016, 12:18 PM
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The listing is from my 1956 Burstein Applebee Co. Radio Master catalog.
Magnetically deflected, but electrostatic focus, unless your kit came with a electromagnetic focus coil? Your build manual must share some information on compatible picture tubes?
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#7
11-20-2016, 05:56 PM
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Get new caps instead of using the wax caps that came with it, also use new electrolytics too.
Be careful, it looks like a hot chassis set. And be sure that the CRT you use has the same heater current as that of the heater string.
__________________
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#8
11-20-2016, 10:33 PM
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Quote:
The CRT used would be a 17HP4, 20HP4 or a 21YP4. I would stick with the 17HP4 type, as the design is a slightly lower high voltage supply, intended for smaller screen sets. I see it uses the tried and true synchro-guide horizontal circuit.  All the CRT's at the time were 600 ma, 6.3volt heaters.
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#9
11-20-2016, 11:52 PM
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Quote:
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#10
11-21-2016, 10:45 AM
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Quote:
The number is not familiar to me and I've seen a lot of old TV's, but not real many Dumonts. Unless you meant, 14QP4? 
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| Audiokarma |
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#11
11-21-2016, 11:18 AM
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Quote:
Last edited by Crist Rigott; 12-03-2016 at 12:05 AM.
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#12
11-20-2016, 11:50 PM
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Quote:
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#13
11-23-2016, 01:36 PM
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I've found that the 17, 20, and 21 inch tubes that specify a minimum ultor voltage will usually work WELL below the minimum recommended; a slight twist of the brightness control will usually suffice. Hell, my Philco 48-1000 refuses to put out more than about 6.5 kV, but the 10BP4 in it still shows a nice watchable, if not terribly bright, picture.
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#14
11-23-2016, 01:46 PM
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I agree, although I believe there becomes more of a focus issue as the deflection angle increases.
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#15
11-27-2016, 08:18 PM
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I checked my Riders index and they cover the 5516! The index lists 18-3 and 21-13. I have Riders for TV vol. 2 thru 12. IIRC Tech-Master 630 chassis is covered in volume 4. Riders included not only the electrical but also mechanical info. Screw sizes etc. I'm thinking that maybe this information would also be included for my 5516 chassis.
Does anybody have these volumes and could you check to see what Riders shows? It would be really appreciated if I could get a copy of those pages. Thanks.
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| Audiokarma |
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