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Question on Manufacture of Old 6550 KT88 Tubes

aeyb701

Member
Scanning the web the consensus is that all "coke bottle" 6550's were made by Tungsol of New Jersey.

I have one though labelled GE (not uncommon) but with EIA (mfr.) code 247, which means RCA from a plant in Penna. can someone explain that?

Also I have a Sylvania "6550" NON-coke bottle that is identical-looking to the Genelex/ GEC KT88 in and out. I think there's a Made in England/ GB/UK mark on it (I'm at work so my recall is iffy on that). Web searches negative. Is that unheard of?

TIA

Jon Archibald
 
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