Need base diagram for 140NB4/CT496 Sony CRT

B

Brenda Ann

Guest
I need the above base diagram so that I can convert a Sony 5-307W. The set
has a 140CB4 CRT in it, which is dead. I have a brand new CT496 CRT, which
has a different base (at least the heater pins are 1 and 3, rather than 3
and 4 on the 140CB4).

TIA

Brenda Ann
 
I don't know if you've already tried, but I would suspect that some vintage
radio/TV sites may have also some CRT pinout info for vacuum tubes.
Generally, in Europe, vacuum tubes are referred to as Valves, but that
probably doesn't include CRTs.

The Sencore (test equipment manufacturer) website had a CRT pinout lookup
tool for use with their CRT testers/rejuvenators. It may still be there.

As maybe a final resort, you could look for a book/chart of CRT pinouts for
old testers on eBay.. you would probably want to find a book that was issued
a couple of years newer than the years that the CRT was used in TVs.

If the CRT gun is clearly visible thru the neck glass, you could possibly
determine the pinout with a close examination.

Good luck with your project.

--
Cheers,
WB
..............


"Brenda Ann" <newsgroups@fullspectrumradio.org> wrote in message
news:bPidncD4etMGWjrRnZ2dnVY3goWdnZ2d@giganews.com...
I need the above base diagram so that I can convert a Sony 5-307W. The set
has a 140CB4 CRT in it, which is dead. I have a brand new CT496 CRT, which
has a different base (at least the heater pins are 1 and 3, rather than 3
and 4 on the 140CB4).

TIA

Brenda Ann
Click to expand...
 
"Wild_Bill" <wb_wildbill@XSPAMyahoo.com> wrote in message
news:vCkqo.244889$De6.183055@en-nntp-01.dc1.easynews.com...
I don't know if you've already tried, but I would suspect that some
vintage radio/TV sites may have also some CRT pinout info for vacuum
tubes.
Generally, in Europe, vacuum tubes are referred to as Valves, but that
probably doesn't include CRTs.

The Sencore (test equipment manufacturer) website had a CRT pinout lookup
tool for use with their CRT testers/rejuvenators. It may still be there.

As maybe a final resort, you could look for a book/chart of CRT pinouts
for old testers on eBay.. you would probably want to find a book that was
issued a couple of years newer than the years that the CRT was used in
TVs.

If the CRT gun is clearly visible thru the neck glass, you could possibly
determine the pinout with a close examination.

Good luck with your project.

I may have to go with trying to do the visual reckoning route. I can't find
Click to expand...
anywhere with a pinout for this tube, and it seems that Sencore has gone a
totally different route since CRT's are fast on their way to oblivion. They
do not make much of anything not related to digital video processing, and
apparently no longer support even their high-end analog test equipment.
 
The CRT is in a vintage (maybe 1963?) portable VHF/UHF TV with radio?

A vintage TV collector-type website may be a possible source, although I
noticed that your inquiry is widespread across a number of forums.

I'm familiar with the frustration of a repair turning into a major research
project.

Sencore and their equipment have changed dramatically in the last 6-7 years,
but so has the entertainment equipment, and service/repair industries.
CRTs will still be around for a while, but not in consumer equipment.

Close visual inspection of the CRT's gun elements may be the quickest
solution.

--
Cheers,
WB
..............


"Brenda Ann" <newsgroups@fullspectrumradio.org> wrote in message
news:dtednfC0f8TY6DfRnZ2dnVY3go2dnZ2d@giganews.com...
I may have to go with trying to do the visual reckoning route. I can't
find anywhere with a pinout for this tube, and it seems that Sencore has
gone a totally different route since CRT's are fast on their way to
oblivion. They do not make much of anything not related to digital video
processing, and apparently no longer support even their high-end analog
test equipment.
Click to expand...
 
Bruce Esquibel wrote:
Brenda Ann <newsgroups@fullspectrumradio.org> wrote:

I need the above base diagram so that I can convert a Sony 5-307W. The set
has a 140CB4 CRT in it, which is dead. I have a brand new CT496 CRT, which
has a different base (at least the heater pins are 1 and 3, rather than 3
and 4 on the 140CB4).

I'm kind of unclear what you need, just the pin out for the original tube in
the Sony or both?

I'm pretty sure I have the Sams PF 811 for the Sony buried somewhere, but
wouldn't have a clue about the replacement you want to use.
Click to expand...

Brenda is looking for both pinouts to see if she can use the CRT as a
replacement for one she doesn't have. She is an electronics tech that
collects & repairs old radios & TVs who spends a lot of time on another
newsgroup.


--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.
 
Brenda Ann <newsgroups@fullspectrumradio.org> wrote:

I need the above base diagram so that I can convert a Sony 5-307W. The set
has a 140CB4 CRT in it, which is dead. I have a brand new CT496 CRT, which
has a different base (at least the heater pins are 1 and 3, rather than 3
and 4 on the 140CB4).
Click to expand...
I'm kind of unclear what you need, just the pin out for the original tube in
the Sony or both?

I'm pretty sure I have the Sams PF 811 for the Sony buried somewhere, but
wouldn't have a clue about the replacement you want to use.

-bruce
bje@ripco.com
 
On Oct 5, 1:40 am, "Wild_Bill" <wb_wildb...@XSPAMyahoo.com> wrote:
The CRT is in a vintage (maybe 1963?) portable VHF/UHF TV with radio?

A vintage TV collector-type website may be a possible source, although I
noticed that your inquiry is widespread across a number of forums.

I'm familiar with the frustration of a repair turning into a major research
project.

Sencore and their equipment have changed dramatically in the last 6-7 years,
but so has the entertainment equipment, and service/repair industries.
CRTs will still be around for a while, but not in consumer equipment.

Close visual inspection of the CRT's gun elements may be the quickest
solution.

--
Cheers,
WB
.............
Click to expand...
Try over at the forums on Videokarma.org. (NOT .com) That's the best
vintage TV collecting/restoration forum I've found. You have to sign
up, but it's free.
If you are a member of the vintage audio forum Audiokarma.org, your
membership carried over. - They split the TV forums off to a separate
site about a year ago.
Mike
WB2MEP
 
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