I have an RCA Victor (1949?) television model 9TC275, chassis KCS29C with
what appears to be a burned out picture tube (a black streak appears on the screen).
Is it likely that I can find a replacement picture tube? If so, how would I do so.
What are my options for restoring the set?
Luke

Hi Luck

The RCA 9TC275 uses a 16AP4, metal picture tube. Polular around 1950 but not used much after that. Be careful the metal cone has 12,000 volts. If the black streak runs across the screen the TV was operated with out vertical deflection. If you don't find a replacement contact a company that rebuilds picture tubes.

Norm

: I have an RCA Victor (1949?) television model 9TC275, chassis KCS29C with
: what appears to be a burned out picture tube (a black streak appears on the screen).
: Is it likely that I can find a replacement picture tube? If so, how would I do so.
: What are my options for restoring the set?
: Luke

: Hi Luck

: The RCA 9TC275 uses a 16AP4, metal picture tube. Polular around 1950 but not used much after that. Be careful the metal cone has 12,000 volts. If the black streak runs across the screen the TV was operated with out vertical deflection. If you don't find a replacement contact a company that rebuilds picture tubes.

: Norm

Thanks, Norm

Is it possible that the picture tube will still work, even if I see a black deposit on the screen?
Should I go ahead and try to get the set working before having the tube rebuilt?
Also, could you recommend a company that rebuilds picture tubes? About how much
will a tube rebuild cost?

Luke

: : Hi Luck

: : The RCA 9TC275 uses a 16AP4, metal picture tube. Polular around 1950 but not used much after that. Be careful the metal cone has 12,000 volts. If the black streak runs across the screen the TV was operated with out vertical deflection. If you don't find a replacement contact a company that rebuilds picture tubes.

: : Norm

: Thanks, Norm

: Is it possible that the picture tube will still work, even if I see a black deposit on the screen?
: Should I go ahead and try to get the set working before having the tube rebuilt?
: Also, could you recommend a company that rebuilds picture tubes? About how much
: will a tube rebuild cost?

: Luke

does this set have a glass cover over the screen?
might be dirt if it does.
may be an ion burn caused by misaligned ion trap.
the tube may still play in spite of the damage.

Hi Luke, What does the black streak look like? If it's a scan burn from lack of vertical scans it will be a narrow dark line across the middle of the screen. It might be feintly visible on the screen when turned off but will be most noticable when lit. Can you see the band when it's off or have you got a raster (illuminated screen)? If it's a black patch visible when off it could be the tube has air in it and the phosphor is damaged. Unless you can see physical damage to the tube I'd try and get the set going and then look for a replacement tube if necessary. I've just heard from someone in the US who has had a tube rebuilt and very pleased with the results. I'll try and find the details for you. If the black is only there when the set's going it sounds like an electronic fault rather than the tube, either's possible. Good Luck, Don Black.

: I have an RCA Victor (1949?) television model 9TC275, chassis KCS29C with
: what appears to be a burned out picture tube (a black streak appears on the screen).
: Is it likely that I can find a replacement picture tube? If so, how would I do so.
: What are my options for restoring the set?
: Luke

: Hi Luke, What does the black streak look like? If it's a scan burn from lack of vertical scans it will be a narrow dark line across the middle of the screen. It might be feintly visible on the screen when turned off but will be most noticable when lit. Can you see the band when it's off or have you got a raster (illuminated screen)? If it's a black patch visible when off it could be the tube has air in it and the phosphor is damaged. Unless you can see physical damage to the tube I'd try and get the set going and then look for a replacement tube if necessary. I've just heard from someone in the US who has had a tube rebuilt and very pleased with the results. I'll try and find the details for you. If the black is only there when the set's going it sounds like an electronic fault rather than the tube, either's possible. Good Luck, Don Black.

: : I have an RCA Victor (1949?) television model 9TC275, chassis KCS29C with

: : what appears to be a burned out picture tube (a black streak appears on the screen).

: : Is it likely that I can find a replacement picture tube? If so, how would I do so.

: : What are my options for restoring the set?

: : Luke

Thanks, Don

I aquired the tv in the late 70's and at that time plugged it in, turned it on, and nothing
happened (I now know that that wasn't such a good idea). I haven't tried to get it working
yet. The black streak is better described as a black "smudge" that is about an inch long and
1/4" wide. It certainly appears with the screen turned off. Although I have experience
in electronics, I haven't done a tv restoration yet, and I would like to get an idea of what
is needed before I attempt the restoration. From what you've written, it seems that
the phospher is damaged.

How does one go about looking for a (perhaps glass rather than metal) replacement picture
tube?

Luke

I had earlier posted a similar request. I have since found out that getting tubes rebuilt is relatively inexpensive (about $100-150). Most rebuilders simply replace the gun. In a case like yours that will not work as there seems to be phosphor damage also. I had the same problem. I had mine rebuilt by Clarke Electronics http://www.jps.net/clarkeel/ He uses a number of different rebuilding shops around the country depending on the job, the gun needed, etc. I was delighted with the results. In my case he used a shop in Atlanta called Video Display Corporation (do not call them directly, they do not deal with individuals). The tube came back in three weeks, in a custom box, not only rebuilt electrically but with all scratches in the front buffed out. The only other comment I would make is that there are minute differences amongst cathode heaters. So when the tube comes back it makes sense to check its current draw individually before reconnecting it to the TV circuit and risk burning the filament.

Thanks, Ali

Tube rebuilding sounds like a good way to go if I can't get a replacement
tube for less than $100-150. Thanks also for the information on the
rebuilder.

Luke

Hi Luke
I checked a few picture tube substitution guides I have.A direct replacement for a 16ap4 which has a clear face is a 16ap4a which has a grey face, and 16ap4b which has a frosted gray face. The grey helps add contrast in light. Others that will work are 16ep4, clear face and 16ep4a gray face. the necks are shorter by about 2 5/8 inches (the overall lengths vary a little between manufactures)and they have more curvature on the screen. I usually look for that stuff at antique radio meets,hamfests, antique flea markets,ect. You can usually pick up an old dead set for 20 to 40 dollars. It doesn't have to be from the exact same manufacturer. Just be careful when looking for metal tubes, they have a tendency to get gassey from the seal leaking.
Paul

: Hi Luke
: I checked a few picture tube substitution guides I have.A direct replacement for a 16ap4 which has a clear face is a 16ap4a which has a grey face, and 16ap4b which has a frosted gray face. The grey helps add contrast in light. Others that will work are 16ep4, clear face and 16ep4a gray face. the necks are shorter by about 2 5/8 inches (the overall lengths vary a little between manufactures)and they have more curvature on the screen. I usually look for that stuff at antique radio meets,hamfests, antique flea markets,ect. You can usually pick up an old dead set for 20 to 40 dollars. It doesn't have to be from the exact same manufacturer. Just be careful when looking for metal tubes, they have a tendency to get gassey from the seal leaking.
: Paul

Thanks, Paul

My brother is an ham radio enthusiast, I think I'll contact him about looking for the substitutions you
recommend. I was considering having the tube rebuilt, but your advice on seal leaking is giving
me second thoughts. It may be that the black smear on the screen is due to gas leaking (see Don's
message to me) into the tube to start with and I doubt a rebuild would eliminate that problem if the
glass to metal seal leaks.

Luke

: hi,
: my tv color 27 size zenith burned out picture tube
need replacement picture tube with G-A68ACT00X WHERE IS PLACE AREA LOS ANGELES,CALIFORNIA. CAN I GOING TO COMPANY ELECTRONICS FACTORY? PLEASE CONTACT ME SOON THANK YOU LARRY FANION

:: hi,
:: my tv color 27 size zenith burned out picture tube
:need replacement picture tube with G-A68ACT00X WHERE IS PLACE AREA LOS ANGELES,CALIFORNIA. CAN I GOING TO COMPANY ELECTRONICS FACTORY? PLEASE CONTACT ME SOON THANK YOU LARRY FANION
:
:We have these tubes and can ship one to you from the factory if you still need one. You can reply to this message or call or fax us at 706.561.5611/ 706.561.8622
The order must be prepaied and is non returnable/non refundable. The cost is aprox. 250.00 plus shipping.