1960s Sylvania Color TV Console Issues

[vortalexfan]

Originally Posted by zeno

Sams will give voltages & CRT pin ##"s. You are looking for something way off.
The volts wont be exact but in the ball park. EX is the G-2's can adjust
between 250 V & 800 V. if off by 20% thats OK. Looking for BIG diference.
The 1974 jug is probably a 25" viewable, the old one probably 23" viewable
so wont swap. Also about 1974 Sylvania CRT's only lasted a few yrs.
IIRC they were called "GT-Matics" & the main chassis was 3 large modules & the CRT was called "Dark Light".
Zeno

OK Thanks for the info. So it sounds like the Sylvania Pix Tubes from the 1960s were actually better than the ones from the 1970s? Am I understanding correctly?

Also I'm hoping that the red gun testing dead on my tube tester is just a matter of a malfunction in the tube tester itself and that the picture tube is actually still good and that the poor pix performance is just a matter of some sort of malfunction in the color demod circuitry (like a bad capacitor or two and or a bad transistor or two) Because this TV is a really good performer otherwise and has a really good performing tuner section.

[Kevin Kuehn]

Like I mentioned before, if you test one of your known good bw crt's you'll verify if the bw/red gun switch position is working correctly.

[vortalexfan]

UPDATE: I retested the pix tube on this TV and sure enough all three color guns tested in the Bad range on the tester and the cut-off test was around 250V til I got to the cut-off mark which I'm guessing means a bad pix tube?

Also I have the numbers off the pix tubes inside both of my Sylvania TVs (the one from 1974 and this one that this thread is about), The Pix Tube inside my 1967 Sylvania TV is a 25AJP22, and the one in my 1974 Sylvania GT Matic is a 25VDMP22 which my tube tester does not have listed in the setup chart for my Pix Tube tester which is a B & K Model 465 CRT Tester from 1966 according to the manual. I'm wondering if these tubes can swap out for each other? If so would there be any sort of modification I would need to do? the first and last 2 digits are the same (they are both 25" tubes and they are both 6.3V heaters, its just the middle 3 and 4 letters I'm not sure about, and why one picture tube has 3 letters in the middle and the other has 4 letters in the middle of the first and last 2 numbers.)

Any help would be appreciated.

P. S. I'm wondering when the 25VDMP22 tube would of came out because I have a tube substitution manual from 1971 and it doesn't list the 25VDMP22 picture tube in the manual but it does list the 25AJP22 tube in there and a list of 4 tubes that would sub out for it.

[Electronic M]

Unfortunately that sub is probably not going to work. Around 1968 a law was passed that changed tube size measurement from outside bulb diagonal to viewable phosphor area diagonal (which is around 2" smaller) and newer tubes that use viewable phosphor area have a V as the first letter and usually 4 letters. So a ~1966 tube like your 25AJP would become a 1969 23VAJP.
The 25VDMP you're looking at is going to be 2" bigger than the 25AJP so it's probably not going to fit.

[vortalexfan]

Originally Posted by Electronic M

Unfortunately that sub is probably not going to work. Around 1968 a law was passed that changed tube size measurement from outside bulb diagonal to viewable phosphor area diagonal (which is around 2" smaller) and newer tubes that use viewable phosphor area have a V as the first letter and usually 4 letters. So a ~1966 tube like your 25AJP would become a 1969 23VAJP.
The 25VDMP you're looking at is going to be 2" bigger than the 25AJP so it's probably not going to fit.

OK, so I wonder if it would be possible to find another 25AJP22 picture tube as NOS on some place like eBay or someone on here might have one and if it could be acquired for inexpensive? I paid $40 and I don't want to pay anymore than $100 to get this TV up and running (the last time i looked into trying to get a NOS picture tube from the Antique TV Society museum down in Cleveland, Ohio they wanted $400 for a 21" B & W Picture Tube for an old Zenith B & W TV that I was attempting to restore that the original picture tube got necked by accident, and I didn't think that $400 was worth it because I didn't have that kind of money on me (I don't even make that much in one paycheck.)

[WISCOJIM]

Try the ETF, they have a NOS one in stock.

I've never heard of them charging $400 for a tube. Last time I heard a price from someone it was $75.

https://docs.google.com/spreadsheets...61&single=true

.

[bandersen]

Yes, $75 for a picture tube at the ETF in Hilliard but he mentioned the Antique TV Society museum down in Cleveland.

[vortalexfan]

Originally Posted by bandersen

Yes, $75 for a picture tube at the ETF in Hilliard but he mentioned the Antique TV Society museum down in Cleveland.

Sorry I meant the ETF, which is in Ohio, but I couldn't remember the name of it, so I typed the first name that came to mind. and yes they quoted me $75 for a picture tube, but they quoted me over $300 for shipping, that's why i said the picture tube would of ended up being $400.

[old_tv_nut]

Not possible to pick it up yourself? Maybe someone going to the convention could get it for you?

[vortalexfan]

Originally Posted by old_tv_nut

Not possible to pick it up yourself? Maybe someone going to the convention could get it for you?

I don't have the money to pick it up in person, that would be about a 200+ mile round trip for me, and I also have to be able to have gas to go to work as well, and that gas has to last me two weeks because I get paid every 2 weeks, and I only get a little over $300 a pay check, and when I have to spend half of that money to pay my aunt back for the furnace in my house and my car, and then my phone and internet payments as well, besides my gas that leaves me with very little money to work with after all of that. If someone that lived not too far from me on here were going to the ETF Museum and could pick up the 25AJP22 picture tube for me and I could meet you somewhere nearby and pay you for the price of the tube and some gas money, or whatever I could do that, but It just isn't in my budget to buy 2 full tanks of gas in one week. Otherwise I would of just went there in person to pick it up.