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  #1  
Old 11-05-2012, 03:43 PM
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radio nut radio nut is offline
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12Lp4a tubes

I will take pictures of three 12lp4a tubes I have plus 2 or 3 -10"round black and whites that will be for sale. The aquadag is pretty much gone off of all of them. On my B&K 465 they all test 400 or higher( scale 0-1000 with 200 being cutoff for bad).

For a project I am doing for myself the aquadag is missing, well actually its all over the chassis!. I did a thread search and someone said use slip plate from Grainger. Does that sound correct?
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  #2  
Old 11-05-2012, 04:27 PM
DaveWM DaveWM is offline
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yep, works great.
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  #3  
Old 11-08-2012, 09:27 AM
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charokeeroad charokeeroad is offline
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The CRTs sound good to me. Are you up for packing them and shipping to California?
Let me know. PM me.
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  #4  
Old 11-08-2012, 12:46 PM
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I'll get in line behind charokeeroad in case he doesn't get them.
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  #5  
Old 11-08-2012, 05:14 PM
dieseljeep dieseljeep is offline
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I have two good 12LP4's. Not interested in selling them right now, but just to state an observation: One is a Philco built one from late 1949. It uses a single ion trap, which is contrary to all the tube manuals, but it's the original issue. The Sylvania is like new, buy uses the double ion trap.
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  #6  
Old 11-19-2012, 02:11 PM
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here are pics as promised
Attached Images
File Type: jpg 006.jpg (50.6 KB, 28 views)
File Type: jpg 007.jpg (73.8 KB, 27 views)
File Type: jpg 008.jpg (51.8 KB, 26 views)
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  #7  
Old 11-19-2012, 02:13 PM
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more pics
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File Type: jpg 010.jpg (39.8 KB, 10 views)
File Type: jpg 009.jpg (75.7 KB, 19 views)
File Type: jpg 011.jpg (60.1 KB, 23 views)
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  #8  
Old 11-19-2012, 02:16 PM
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still more
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File Type: jpg 013.jpg (41.9 KB, 7 views)
File Type: jpg 012.jpg (68.8 KB, 7 views)
File Type: jpg 014.jpg (47.2 KB, 10 views)
File Type: jpg 015.jpg (54.8 KB, 15 views)
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  #9  
Old 11-19-2012, 02:19 PM
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10 inch. my other 10 went to air trying to solder pins
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File Type: jpg 020.jpg (52.1 KB, 13 views)
File Type: jpg 016.jpg (85.2 KB, 8 views)
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  #10  
Old 11-19-2012, 04:42 PM
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Oh, Number one and three are rebuilt. number four is also but it is a ten inch. the rest are 12lp4's
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  #11  
Old 11-19-2012, 10:02 PM
bob91343 bob91343 is offline
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The 12LP4 tubes have that designation because the LP stands for Long Play. You can only watch programs that are longer than 1/2 hour; they have an interlock that prevents channel change for 30 minutes. Very clever, I think.
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  #12  
Old 11-20-2012, 04:51 AM
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All four look good. I'm a buyer.

Thanks
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  #13  
Old 11-20-2012, 04:52 AM
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Quote:
Originally Posted by bob91343 View Post
The 12LP4 tubes have that designation because the LP stands for Long Play. You can only watch programs that are longer than 1/2 hour; they have an interlock that prevents channel change for 30 minutes. Very clever, I think.

Yes, but that's only for the first day of use. After that you're free to roam around the dial.
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  #14  
Old 03-14-2013, 09:09 AM
bcroe bcroe is offline
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Any idea where I can get a decent
12" round picture tube? I have a '48 Andrea that tunes
continuously from channel ONE to 13 (and everything
else in between, like FM, 2 HAM bands). But needs
a CRT. Supposed to be a 12QP4, but I'm told a 12LP4
works with the right ion trap. Bruce Roe K9MQG
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  #15  
Old 03-14-2013, 03:18 PM
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StellarTV StellarTV is offline
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You can use a 12LP4... it's a bit longer than the 12QP4 and might stick out the back.
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