Dual Chassis. Philco T51-1604 - Videokarma.org TV - Video

Tom_Ryan · #1 08-26-2006, 08:48 PM

Yesterday I received delivery of a Philco B&W dating back to 1951 from a collector in New York. A bit of a risk shipping cross country but I took a chance anyways. The cost of TV and shipping was under $75 from the New York to Southern California. Not bad. At the time I didn't know it was a Model 51-1604. I thought I was getting 12" round tube tv. Was I surprised when I realized it was a 16" set.

Apart from a few tubes fallen out from travelling across the country UPS style - I was amazed it survived intact when it landed at my door step!

I was very curious about the 2 chassis design and a single 7F7 loctal tube (hey Charles that's why I bought Hassy's 5 pack!!!) in the power supply - horizontal output chassis. The 16" CRT is all glass - perhaps a 16LP4, the getter is silvery and screen has no ion burn. Uses dual 6BQ5 sweep tubes in parallel.

Does any know why Philips used a single loctal tube in this set? Apart from Philco inventing the loctal, the use of that type of tube in this TV seems to date back to pre-war designs. Ideas?

***Eric H*** · #2 08-26-2006, 09:20 PM

Hi Tom, there was some discussion about Loctals in this thread:
http://www.audiokarma.org/forums/showthread.php?t=79311

Seems they were probably used because Philco invented them.
They were done with them by 53 at least though, i've got two split chassis Philcos from that year and they don't use any Loctals.

vintagecollect · #3 08-26-2006, 10:08 PM

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Tubejunke · #4 08-26-2006, 11:32 PM

I think it looks like a color roundie as well. However there is the factor of the Loctal tube. Hmmm....Hey Tom whats the CRT #?

Tom_Ryan · #5 09-04-2006, 02:13 AM

Quote:

Originally Posted by Tubejunke

I think it looks like a color roundie as well. However there is the factor of the Loctal tube. Hmmm....Hey Tom whats the CRT #?

Finally made some time to take another look and found the set is using 16WP4A. I also found that the set uses a couple of loctal tubes - audio output and sync seperator. I need to did out the B&K to test the CRT and see what emission life is left.

Stay tuned!

David Roper · #6 08-27-2006, 12:13 AM

The "51" indicates the model year, as in 1951. A bit late for a round b&w CRT, but rest assured--100% assured--that's what it is. It's not a color TV, just purge that thought right out of your mind.

bgadow · #7 08-28-2006, 11:09 AM

I have a similiar Philco, probably the same except for the cabinet. Maybe this was a "clean out the warehouse" set, to get rid of round tubes and loktals! Yep, loktals were cooked up by Sylvania, I think with Philco's input, and you will find them in heavy use by Zenith, Philco, Silvertone, but not many others. I kinda like 'em.

I had mine working more or less but now it just has a blank raster. I think it still has some black beauties in it. This one should respond well to recapping; the dual chassis is handy as it takes up less space on the workbench. Kinda like tackling 2 radios instead of 1 TV.

andy · #8 08-28-2006, 01:04 PM

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Don Lindsly · #9 08-28-2006, 01:50 PM

Philco Engineering worked from a list of preferred standard tubes. The list was developed and evolved based on several factors including electrical characteristics, cost, source, availability in quaitity and prior experience. In your case, the tube was applied in a circuit that was used in earlier designs so no one needed to get very creative.

Don