[NJARC] "Untestable" tubes

[William S Zukowski]

http://www.tubezone.co.uk/product/b8a-philips-ceramic-rimlock-8-pin-tube-socket/


 From Wikipedia:
Rimlock baseThe Rimlock
  (B8A) base is an 8-pin design with a pin circle diameter close to
noval, and uses a nub on the side of the envelope to engage with a guide
  and retaining spring in the socket wall. This provides pin 
registration
  (since the pins are equi-spaced) and also a fair degree of retention.
Early tubes with this base type typically had a metal skirt around the
lower ~15mm of the envelope to match the socket wall, and this offered a
  degree of built-in screening, but these were fairly soon replaced by
'skirtless' versions which had a characteristic widening in the glass to
  compensate physically for the absence of the skirt. In the European
naming scheme, rimlock tubes are numbered in the ranges 40-49, 110-119
(with exceptions), and 400-499, e.g. EF40. Although virtually unknown
elsewhere, this was a very common base type in European radios of the
late 1940s through the 1950s, but was eventually displaced by the
ubiquitous B7G and noval (B9A) base types.


On Mon, Sep 11, 2017 at 09:54 PM, Al Klase wrote:
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_________________________________________________________


     Max,



     Wow, I didn't know that such a base existed.





     That's from the the EF41data sheet.



     Anybody have any ideas?



     Al




On 9/11/2017 9:12 PM,
       theis.max at gmail.com <mailto:theis.max at gmail.com>  wrote:




       Specifically EF41 and EL41

Sent from my iPhone



         On Sep 11, 2017, at 9:11 PM, theis.max at gmail.com 
<mailto:theis.max at gmail.com>  wrote:

Hey Al,

Have you run into German tubes with no pin gap and just a glass nub to 
be the pin key?

How does one test these?

-Max

Sent from my iPhone





     --
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/ <http://www.skywaves.ar88.net/>


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