One of the Leslie speakers we just worked on was built in 1992 and had 1992 date code MPD 6550 tubes in it. These were made in Owensboro in the GE factory and I think these were the last "regular" glass tubes made here by the MPD co. which took over the GE tube factory, and the last year of glass receiving tube manufacture there.
They still used the "Electronic Tube" script logo but had no GE logo. They said "Built to GE specs by MPD Inc. in Owensboro, Ky." They had a regular 92-xx date code on them.
I don't think they had a sandblasted stencil tube number on them though...maybe that machine had gone into mothballs due to the small amount of glass tubes still being made?
Thanks for posting the GE tube code...in years of searching on the internet I have seen no explanation of it till now!
Last edited by Chad Hauris; 11-12-2007 at 08:31 PM.
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