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For John's request and for comparison, my 6-bolt, 14 pin prototype tube is paper tagged;
Developmental type - C73293C
Serial - L3046R
Rim stamped - D229
And it has acquired a swooping crack right across the faceplate but not edge to edge. No idea how that happened. Have not looked at it in 5 years. Gotta be careful now.
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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