I received the following from Merit Arnold, W6NQ, of RF Parts with
clarification info.
It still leaves questions open on the Marshalls that may never be answered.
Its been my experience that JAN boxes have contract # and dates on them at a
minimum. Also the tubes would be date coded.
Has anyone info on who Marshall is?
Carl
KM1H
Hello Carl:
Just a note regarding a few tubes being sold by RFP that you have questions
on.
The tubes we have in stock under the "Marshall" name are JAN surplus,
Marshall Electronics, made in USA on boxes.
No address. No date info.
The tubes look like the traditional US design with horizontal fins on
plates, etc.
We also have the Cetron tubes, also JAN, dated 5/88 from Richardson.
Haven't had any reliability issues with either.
By the way, the last time we bought Cetron 572B was in 1988-89.
The last production run they had was experiencing a DOA of about 15%
due to broken filaments (admitted by Richardson).
The last quote at that time was $75 each in lots of 1000, without the
ability to schedule.
So we dropped them as a source, and stayed out of the 572B business until
better
Chinese/Russian tubes came along at affordable prices.
Regards,
Merit, W6NQ
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