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In Reply to: RE: Mullard GZ-34 F31 smooth plate ID posted by SoCalAl on March 07, 2023 at 09:46:57
I see f31, B81 code on the tube at the left. Blackburn, 158/68 or 78 probably 31st week???
Follow Ups:
1958/68 or 78
"F31" type GZ34 is from 1958. However, I believe the question was regarding the GZ34 on the right, using that '58 Blackburn GZ34 as comparison.
My bad lol. You're absolutely right, I misread the post. I'm still laughing at myself for not reading the OP's post correctly.
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