#31
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#32
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If you are worried about the CRT keep in mind most Zeniths from this era had it & the CRT's are the longest lasting of any ever IMHO. Not much heat generated & not a lot of power used. In theory & my opinion keeping the CRT warm eliminates most of the hot/cold cycle & expansion / contraction that kills things. All tube sets especially built on PCB's suffer from extreme drying out of everything & risk of fire. Thats why cats love to sleep on them ! 73 Zeno |
#33
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I admit that the CRT's life was a factor in my decision, but that's not really my main concern. I just want the longest warm up time because I'm weird that way.
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"If you wish to make an apple pie from scratch, you must first invent the universe." -Carl Sagan |
#34
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well my flat chassis bit the dust after 3 days.big snap and suddenly i had a very small picture.safety cap blew.set was changed over to a tripler without focus block.they didnt change out the white caps.it has a replacement oval shapped capacitor.i ordered 6 spraque orange drops nos from ebay.4.00 plus 2.00 shipping.they got here yesterday.installed and its back!completely disassembled and cleaned every inch of the tuner,deoxit on every control and module.hit the switch and ..............................it works!tuner locked solid,full screen and once again,the patented zenith look.it got about 5 hours of viewing today and was flawless.i did have to readjust twice.seems the crt is slowly getting brighter.second adjustment held about 4 hours.i will post pics.cabinet is not too bad after a very close inspection.i have an avanti with a like new crt and a decent cabinet or should i wait until i find donor modules?will post pictures tomorrow
Last edited by sampson159; 05-09-2016 at 09:03 PM. |
#35
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If you want long warm-up time a SS set is NOT the way to go. Even with no instant-on...a picture will be watchable on most within 15 or so seconds...and at full output by 30-40 seconds..
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Audiokarma |
#36
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I'm used to solid state sets' warm up time. It's still a mighty nice TV though. It will be the centerpiece of my room when the chassis is fixed next month.
__________________
"If you wish to make an apple pie from scratch, you must first invent the universe." -Carl Sagan |
#37
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Concerning your loss of HV, you can disconnect the lead at the tripler that comes from the flyback. Then, move this lead away from anything that it can arc to. Then, power up the set and if HV is getting to this point, you'll be able to draw an arc to a screwdriver, when you bring the screwdriver blade close to the end of the lead. If you get the arc, that means everything up to that point is good and your tripler is bad.
If you don't get the arc, that means no HV is getting to the tripler and there are a number of things that can cause this. Two common things are loss of B+ voltage to the horizontal output stage and loss of horizontal drive to the base of the horizontal output transistor. No horizontal drive can be caused by a defective horizontal oscillator module, no B+ voltage going to said module, or an open winding on the horizontal driver transformer. There are other things that can cause it; but, these are most common. If you're getting no B+ voltage at the horizontal output transistor (should be around 120V-130V), the most likely cause is either an open winding on the flyback or an open power resistor that feeds voltage to the flyback. The horizontal output transistor is likely still good because when they fail, they usually short and when that happens, the circuit breaker will trip. While you're in there, that sloppy connection to the tripler needs to be redone and it would be a good idea to seal this connection with RTV (once the set is fixed).
__________________
http://www.youtube.com/user/radiotvphononut |
#38
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Don't anyone forget abut the "interlocks", on one of the b+ line--I think the 24V. line..that runs THROUGH the modules. if one of these gets a bad connection...NO HV or Sound..
I discovered this the "hard way" nearly 30 years ago..when working on a flatty...it had this problem... |
#39
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I used a remote power switch, the kind often sold around Christmas time used to turn on lights. Just plug the set in, leave the power switch on, use the remote to turn it off and on. I looked a the circuit that powers the filament, did not look like something I wanted to defeat, but also rarely watch the TV so did not want the filaments left on all the time.
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#40
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I took the chassis to Danny when I was there the weekend before last. When we where testing it, two if the filter caps opened up and caused no sweep whatsoever. I think he's almost got it all sorted out. I will pick the 25DC56 up on June 11.
__________________
"If you wish to make an apple pie from scratch, you must first invent the universe." -Carl Sagan Last edited by TUD1; 05-23-2016 at 04:24 PM. |
Audiokarma |
#41
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I polished the hardware on the front of the TV yesterday with Brasso. I'm pretty satisfied with how it turned out. This cabinet style is really starting to grow on me, even though it has some plastic. Zenith called this style "Mediterranean". Danny sent me a picture of this ad depicting two similar models. Does anybody know this TV's name?
__________________
"If you wish to make an apple pie from scratch, you must first invent the universe." -Carl Sagan Last edited by TUD1; 03-12-2017 at 06:53 PM. |
#42
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D line hand out shows
D4758P or DE the Virgil w/ 3 pulls D4748P or DE the Salvini looks like 2 pulls & key escutcheon P= Pecan DE= dark oak Funny thing with pulls. Almost everyone pulled on them on the sales floor to see if they worked. None did ! 73 Zeno |
#43
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Thanks, Zeno. I'll check, but I think the model sticker fell off.
__________________
"If you wish to make an apple pie from scratch, you must first invent the universe." -Carl Sagan |
#44
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Good news! Danny got the 25DC56 working! He used his Avanti to test it, but it will be going back in my 1973 console cabinet. The Virgil.
__________________
"If you wish to make an apple pie from scratch, you must first invent the universe." -Carl Sagan Last edited by TUD1; 01-30-2017 at 05:07 PM. |
#45
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well I guess I know what the weather is here Atlanta or down in Atlanta. lol That's good he got it going.
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Audiokarma |
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