Help on Really Old Tubes

[SCN User]

Dave,
Before the numbering standards settled into a common procedure, various
manufacturers including Cunningham added more characters to distingquish
their tubes from RCA etc.  See below for the alternate ID numbers.

73   Pat   K7YIR

-------------------------

On Thu, 22 Jul 1999, Dave Hollander wrote:

> Greetings all -
>
> I have some really old tubes that I need to test, they are a
>
> UX-171A    (71A)
>
> CX-301A    (201A   or    01A)
>
> CX-300A    (200A   or    00A)
>
> CX-340     (not sure on this one but try 40)
>
> 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?
>
> Any help would be appreciated. This is a bit older than I am used to
> working with.
>
> Tnx and 73,
>
> Dave N7RK>
> *******************************************************************

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