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#16
03-10-2013, 04:10 PM
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Quote:
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#17
03-11-2013, 12:12 AM
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Good point about the parts being hard to get, even for a popular type. I recently had to part out a beautiful 58 Zenith Space Command. Up to a point I would have never sold a single part from this set. It just seems wrong as a sort of collector of such things to destroy or dismantle something that regardless of popularity frankly is just very old and not easy to find. However, I couldn't sell the set as for the most part people don't want to bother with the cost and risks involved in shipping. So, I was put in the situation with the hope that somebody will want the easier to ship parts. Most particularly the remote control related stuff.
So I guess this works both ways, but I still think that you will be able to find a Predicta fly if needed and it's great that you found an older tech with the knowledge to even begin to work on tube driven equipment. I sometimes wonder what will happen when all of the great (and in my mind superior) understanding of electronics is gone. I hope that somehow it is passed down through younger people interested in the golden age of electronics. I am in my early 40s and grew up in the wake of this era, and luckily enough of the stuff was stored and often used when I began training in high school. Most of our school's donor sets were 50s and 60s models back in the 80s. We even had a Predicta in the lab! Then it was just oddball junk for the most part; the Predicta that is. I'm also glad to have been taught to read an actual VOM scale as all of our meters then were Simpsons. Later in college when digital meters were common I used to love the electronics (digital) wiz kids scratch their head as I did my lab work with one of the last two working Simpson VOMs.
__________________
"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free"
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#18
03-11-2013, 12:24 PM
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On the few Predictas I have replaced flybacks on, the replacement part consists of only the windings and HV 'tire' with tinned wires sticking out. You have to re-use the powdered iron core, 'C' clamp, and terminal board. AND you have to be super careful to replace the two thin fiber spacers between the core halves, as these determine the resonant point of the transformer.
These were Philco direct replacements, but i've read that the whole transformer could also be obtained from other supplyers (maybe like Triad, Thordarson et al.).
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#20
03-11-2013, 04:34 PM
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I can look them up, but I need to know what model Predicta chassis it is.
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#21
03-11-2013, 06:03 PM
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I believe my TV ( Brazilian Predictas have a slightly different cabinet; see this photo: http://www.tvhistory.tv/1958-Philco-Predicta-BRAZIL.JPG ) uses the same chassis as this model of American Predicta:
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#22
03-11-2013, 06:45 PM
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That looks just like the American Holday model which uses the 9L37 chassis.
Philco = 32-8853-1 Thordarson = FLY-196
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#23
03-12-2013, 06:31 PM
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And... I am very lucky
The old gentleman I referred to in a previous post examined the TV today. The problem was something very simple: the wire that connects the flyback with the 6DQ6A tube ( I believe it is that tube ) short circuited and burned. So it was only a simple wire and not the flyback. In a few minutes he solved the problem and the TV is now working again. I am very happy.
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#24
03-12-2013, 11:07 PM
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Nice to know!
__________________
Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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#25
03-12-2013, 11:18 PM
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Lucky you
 Those Predicta flybacks can be hard to find and expensive.
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#26
03-13-2013, 08:51 PM
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This Predicta is not letting me have peace: today it malfunctioned again. I turned it on and immediately heard a small "pop" sound coming from the inside of the set. Them I waited, and waited, and waited... and no sign of life came from the TV, no sound, no light on the screen, nothing. The tubes inside the TV are lighting up, but there's no other signal of life coming from the set. What can be wrong now? The tech that repaired it will only be able to take a look on Sunday.
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#28
03-14-2013, 10:41 AM
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Sand coated fusible resistor was my first thought, but wasn't sure this model uses one. We called 'em "Gravel Gerties".
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#29
03-14-2013, 11:05 AM
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Quote:
Has this TV ever been properly restored/recapped by someone in the know about Predictas ? There are quite a number of things that could go pop and render your TV inoperative in the way you describe . The tube's heaters lighting means the set is getting power and that at least part of the circuits are still functional . With neither picture nor sound a B+ voltage issue is one highly likely possibility especially if any old capacitors are still lurking about in there . If it has been properly restored maybe your just seeing the "infant mortality" of the many new components ? It it hasn't been properly restored , even when this most latest issue is fixed , you'll likely begin frying expensive parts if you keep running it ...
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