To expand on things.....
The big CRT label usually says "EIA ###" on it if its a US
tube. Jap & ROK do not that I remember any with them.
A Sanyo tube may say Sanyo on it but may say EIA 312
for Sylvania who sold Sanyo most of there jugs.
A label is usually the same style. A mid 70's RCA tube
you can find in RCA, Magnavox, Admiral, Sears/Warwick &
others. The labels are all the same except brand & color.
The EIA 274 is always the same.
( A photo of the label may help)
Bottom line is if you can narrow it down to who made it
you can look for a TV donor. You may not find the exact
number but if it physically fits the electronic properties
are usually the same.
73 Zeno
