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#1
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Rca 621TS
I picked up this TV this evening. Drove to Houston, sealed the deal and drove back. Got in about 11pm.
Overall the set looks nice. It is an older s/n like C 0003445. Pretty clean inside and no rust except on the surface of the transformer. Here are a few pics of it: I tested the 7DP4 picture tube with my BK 467 CRT tester. Here is the result: And the LIFE TEST: The HV lead was disconnected and in faint letters the word BAD was written on the top of the CRT: What gives? The tube looks to be in excellent condition. Very pleased with the purchase. But wait, there's more! I also got this from the same seller: Last edited by Crist Rigott; 04-12-2017 at 10:44 PM. |
#2
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Crist,
Glad you were able to buy the 721 with a good CRT, and that Philco. They will keep you busy for awhile. Ed |
#3
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Thanks Ed. They will.
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#4
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I rechecked the CRT this morning. Yup, it checked that good and no shorts or anything like that. No rattles either. This CRT looks brand new and is a genuine RCA 7DP4 CRT. No evidence of being rebuilt either. I'm not sure those could be rebuilt anyway.
Also the TV does not have a back. So, if anyone has one let me know. I'm going to see if I can find a good picture of a back and see it one can be made without too much difficulty too. Next up, I'll pull the chassis. Stay tuned. |
#5
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Yes, they could be rebuilt. Scotty at Hawkeye was doing them before he shutdown a few years ago. Pretty much the same gun as any other early B&W CRT. Only difference being the electrostatic focus.
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Audiokarma |
#6
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Bob,
OK, I didn't think they were re-buildable. Good to know. Why I think this tube is not rebuilt is that the neck is straight with no evidence of an extension being fused on. |
#7
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OK, pulled the chassis. There very minor rust spots on the chassis but no big deal. The bottom line is it looks like somebody did a partial resto on it. I should have noticed the fuse holder as my first clue. This one will be a good one that's for sure. Seeing it has been partially restored, should I take the chance and power it up using a variac?
Last edited by Crist Rigott; 03-07-2017 at 06:14 PM. |
#8
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Well that sure is a nice clean chassis. Apparently the previous restorer didn't have the perseverance and/or resources to complete the project. Some folks very quickly jump to the conclusion that the big bulb must be at fault. At any rate this should be a very educational project.
[edit] Forgot to ask - is there any indication that the electrolytic cans have been restored? Last edited by Kevin Kuehn; 02-02-2017 at 10:31 AM. |
#9
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Quote:
Looks like the E-Caps have been re-stuffed. I looked closely and I might just power this thing up. |
#10
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That circle on the base of the CRT with a date code seems to indicate it's a replacement tube, either new or rebuilt, I know they used that style at least as late as 1960.
What are the numbers? |
Audiokarma |
#11
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Quote:
--- 48 |
#12
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I powered the set up.
First with the low voltage rectifier removed. All the tubes lit up. Then with the low voltage rectifier in but the H output tube plate cap removed. I measured 263 volts! Riders says 265 volts. I received good audio from a local OTA broadcast! Then on goes the H output tube cap connection. No raster. Bummer. Then I remembered the ION trap. Moved it around a little. Nice bright raster! Hooked up my converter box and now the audio isn't so good on channel 4. But I got a picture! Horizontal sync needs lots of help. I'll bet its a mica cap. All-in-all, this set looks like it'll do good. |
#13
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It looks like someone eliminated the PM ion trap and used the resistor in its place.
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#14
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I think he eliminated the electro-magnet, installed a resistor in its place, and installed a permanent magnet ION trap.
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#15
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I meant it the other way around! Subsituting a PM ion trap for the EM ion trap and using a resistor in its place.
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Audiokarma |
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