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 A short history of the EF50 valve
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 Return to top of page · Post #: 1 · Written at 9:47:08 PM on 17 July 2025.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6882

QUOTE: the superior performance of the EF50 enabled it to be used in the radar sets of the time. It enabled the British RAF Spitfires and Hurricanes to scramble and take-off in time to meet the oncoming attacks.

https://www.youtube.com/watch?v=AKMH-BPtrCw
 
 Return to top of page · Post #: 2 · Written at 7:34:43 AM on 18 July 2025.
Fred Lever's Gravatar
 Fred Lever
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 1379

ITo find out more about the EF50 valve back in 2016 I used a bunch of them in a valve based CRO.
They are indeed a handy valve , I made the vertical amplifier work very well.

Have a look at 'building a valve CRO from junk parts'. Feb 2016 in the' special projects' section.

Fred.
 
 Return to top of page · Post #: 3 · Written at 5:22:56 PM on 18 July 2025.
Ian Robertson's Gravatar
 Ian Robertson
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2629

If anyone wants to experiment with LOTS of them, I have a large qty of their B9A successor, the EF80 aka 6BX6.
 
 Return to top of page · Post #: 4 · Written at 9:52:27 PM on 18 July 2025.
Robbbert's avatar
 Robbbert
 Location: Hill Top, NSW
 Member since 18 September 2015
 Member #: 1801
 Postcount: 2193

Didn't know the 6BX6 was related to the EF50. I might have a EF50 in my collection, not sure.

There's lots of 6BX6's from old B&W TVs scrapped from the dumpyard 50 years ago.

You can use 6BX6 to replace EF89 in European radios and get more gain.

Or, in the unlikely event of a shortage of 6BH5 or 6N8 (diodes not used), can rewire the socket and use 6BX6.
 
 Return to top of page · Post #: 5 · Written at 8:07:54 AM on 21 July 2025.
OliBHolmes's avatar
 OliBHolmes
 Location: Nuriootpa, SA
 Member since 28 June 2025
 Member #: 2734
 Postcount: 27

Thought I would see this here!
 
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