#16
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I think so also... looks to me like all 3 of the electrolytics in the 25Z6 negative supply are backwards.
jr |
#17
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Not the FIRST time I have seen that in a diagram. IIRC...the diagram for my 48-700 had one or more electros wired BACKWARDS..for the HV supply...
Don't they PROOFREAD these diagrams--before they are published ? I would expect TODAY...maybe not..but back THEN..when people took MUCH more pride in what they did..they would have triple-checked for errors.. Last edited by rca2000; 05-19-2016 at 10:36 PM. Reason: More info. |
#18
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Quote:
The power supply was the only repair that our set had in four years of use. Emerson built a projector set, that used the same basic chassis, per Riders. |
#19
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I stumbled across this old post, and wanted to add some information. The first Emerson TV was the 545, which had a power transformer. The cheaper 571 had the hot chassis, with all of those 25Z6 rectifier tubes. The incoming AC is doubled to about 250, and is also rectified to give a negative 125 volts or so. This gives about 375 volts end to end, to supply the deflection circuits. For the next production of that chassis type, Emerson replaced the tube rectifiers with seleniums.
I wanted to add this information, in case anyone here gets to work on one of those old beasts. I have owned an early 571 for 40+ years! |
#20
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I have a 638 console that uses the same chassis with the selenium rectifiers. It also has all those open holes were the tube rectifiers were in the previous version. I also have the 14" 698 model that stromberg6 mentions. It's been a 4 or 5 year work in progress but I'm very close to firing it up. I've nicknamed that chassis the spaghetti monster. It's just a wiring nightmare.
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Audiokarma |
#21
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Quote:
__________________
"Restoring a tube TV is like going to war. A color one is like a land war in Asia." |
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