Help on Really Old Tubes

[Christian Fandt]

Upon the date 06:17 AM 7/22/99 +0000, Dave Hollander said something like:
>Greetings all -
>
>I have some really old tubes that I need to test, they are a
>
>UX-171A
>
>CX-301A
>
>CX-300A
>
>CX-340
>
>These are all Cunningham tubes (all 4 prong bases) out of a 1925 Browning
>Drake Receiver. I thought for sure that my really old Hickok would test
>them (The chart in this tester is dated 1940 but they are not listed. Do
>these tubes go by some other equivalent numbers?

Dave, have you tried looking up just 71A, 01A, 00A and 40 on the chart?

Back "in the olden days" up 'til around 1926 or '27 (somebody knows the
exact date I imagine) the very first digit simply designated the
manufacturer, e.g., '1' == GE, '2' == RCA, '3' == Cunningham and (I think)
'4' == Deforest. My memory is a bit fuzzy on these as I've not studied the
numbering for a half-decade or longer and I know my notes on the subject
are still deeply buried from our recent move to this house. Maybe one of
the other list members can take it from here . . .

Regards,  Chris
-- --
Christian Fandt,         Electronic/Electrical Historian
Jamestown, NY  USA      cfandt at netsync.net
Member of Antique Wireless Association
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