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#16
10-05-2009, 11:47 PM
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Quote:
Phil and I will be able to compare notes on this restoration 
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#17
10-05-2009, 11:54 PM
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Yah, that Crosley chassis does look like the same, from what I can see. Interesting.
The huge can on the HV cage must be an electrolytic, although I've never seen one that size, and the markings on it give no clue. I spoke too quickly before; it's wired in place of one of the filter caps, not paralleled with it. I'm itchin' to start playing with it, but I forced myself to stick it back in the cabinet and wheel it off to the side until I finish other things. I do like that cabinet style, now that it's home. That antiqueradios thread is a real textbook. Let's hope I don't find problems like a broken Inductuner shaft! Phil
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#19
10-06-2009, 06:29 PM
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Nice set. Ever since I got my first Dumont, I've been looking for more....
http://farm4.static.flickr.com/3445/...b29745c7_b.jpg Mine is a '49 also. MK
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#20
10-07-2009, 01:25 AM
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DuMont is the KING of power transformers! I remember my old RA-109A had this crazy thing that looked as big around as this one, but twice as tall. Wow! Dual LV rectifiers and all. I wonder if the HV rectifiers are dual. Mine were, but the 109 is a far different chassis.
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#21
10-07-2009, 12:29 PM
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That transformer is a serious piece of iron. About six inches tall. I have a special machine for moving these heavy chassis. It's called my 23-year old son
 On this chassis I spy two 5U4Gs and one 5V4 by the HV cage. Not sure if I have the right papers for this set. The crumpled schematic lists RA-103/104A/110A and shows two 5U4gs and two 6X4s. Eventually, I should get the right schematic. The serial plate in back says RA-103, serial #27171. I'd love to get knobs for this set. The seller told me they were all lost, but last night I went through the box of spare tubes (39 good ones --Yay!) and found this one. So I need four more like this, plus the big tuner knob. Phil
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#22
10-07-2009, 01:02 PM
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I have the complete DuMont schematics, alignment and parts lists for RA-101 through RA-171. They list RA-103D, 104A and 110A as the same schematic so that's probably the one for your set.
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#23
10-08-2009, 12:56 AM
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Dang, change of plan. My wife put her foot down about "more ugly black and white TVs," so I slopped some Howard's on the cabinet and did a color conversion. Maybe I'll get used to it. At least it was worth a good laugh watching the trashman try to lift that useless old chassis from the curb!
(Just joshin' -- I was sorting a bunch of photos and just couldn't resist.)
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#24
10-08-2009, 12:44 PM
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 You really had me going there. I was getting all ready to write a really nasty response
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#25
10-08-2009, 07:43 PM
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Quote:
Mine doesn't match. Sams shows a little sub-chassis with two 6X4 tubes, sticking up from the main chassis by the power transformer. Nothing like that on mine, and no evidence there ever was such a critter. The serial plate just says RA-103-. No D or other letter. Serial # 27171. ? Phil
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#26
10-08-2009, 08:04 PM
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I did an RA-103 "Chatham", in superb cosmetic condition, a few months back.
You'll have little problem with it, is my guess. It's a LOT less complicated than the 630TS. Mine works great. A little quirky with Sound synching up to Video when first switched on, but, it settles down when warmed up. My RA-105B "Sussex" is my most trouble-free vintage TV. I switch it on, and Picture and Sound are Rock-On. No tweaking needed, ever. LJB 
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#27
10-08-2009, 08:17 PM
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Here's a partial schematic of a RA-103 C. Does it match?
http://www.bobandersen.com/images/sc...103%20C-01.jpg
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#28
10-08-2009, 09:34 PM
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That looks more like it, without 6X4s. Looking at my crumpled sheets, I have a page 13 from what looks like the same book, with schematic for RA-103D & others mentioned before. I also have pages 10, 11, and 12, labeled RA-103C. If the one you scanned is page 9, that may be the missing link.
I wonder if this set is in Riders . . . ? Phil
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#29
10-08-2009, 09:48 PM
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Yep, I scanned page 9. Pages 9-12 are RA-103C from DuMont Television Service Data 1953.
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#30
10-18-2009, 12:05 PM
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Either I'm nuts or this guy knows something that I don't. I started on the power supply filter caps for my RA-103. This TV had the big box cap (10mfd/600v) strapped to the top of the high voltage cage.
It looks like he took the two 80mfd filters, C262 and C241, out of circuit, along with the 100K resistors R316 & R317, and subbed this 10mfd cap. In the photo, C241 is above C262. The long blue and red leads came from the box cap. So that cap was wired between the positive of C262 and negative of C241. The resistors are nowhere to be seen; perhaps they were originally mounted on the cans. I'll put everything back as per the schematic, of course. Just wondering whether this scheme actually worked. That was a big honking (possibly nonpolarized?) cap in that box, despite the low capacitance value. (Don't ask me to fire it up with that thing in place just to see what happens. The answer is No )Phil Nelson
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