[Boatanchors] EF50 Tube

[Bry Carling]

WW2 era radar tube also used for i.f. strips etc.
I have some new ones here. It was used in the ONE tube home brew receiver I tried to build 
from a magazine article around 1964 or so which failed miserably. I had no test equipment and 
would not have known how to use it anyway! I gave up on that receiver. NOW I have some EF50s and woul dlove to find the design again so I could give it another shot.

Does anyone have any articles or schematics for home brew receivers using the EF50?

I think mine used EF50 for EVERY stage in the radio!

Bry Af4K

> Date: Sun, 23 Oct 2016 17:08:33 -0400
> From: hwhall at compuserve.com
> To: mmab at cox.net; boatanchors at mailman.qth.net; ark at ar88.net
> Subject: Re: [Boatanchors] EF50 Tube
> 
> Maybe try checking the pinouts of the TV-7 tube sockets to see if all pins 1 are common, etc.  If so, and it is for my Hickock unit, then you probably can make up an adapter to plug into a 9-pin socket.
> 
>  
> 
>  Wayne
> WB4OGM
> 
>  
> 
> -----Original Message-----
> From: Michael Bittner <mmab at cox.net>
> To: boatanchors <boatanchors at mailman.qth.net>; Al Klase <ark at ar88.net>
> Sent: Sun, Oct 23, 2016 2:24 pm
> Subject: Re: [Boatanchors] EF50 Tube
> 
> Guess I should have put "TV-7 tube tester" rather than "EF50" as the subject 
> of my initial email.  My TV-7 does have supporting data for testing the EF50 
> (alias CV-1091) but no socket for same.  Does anyone know of a TV-7 adapter 
> for 9-pin loctals?  I assume there must be one, based on the CV-1091 data in 
> the TV-7 data book.  Mike, W6MAB
> -
> -
> 
> ----- Original Message ----- 
> From: "Al Klase" <ark at ar88.net>
> To: <boatanchors at mailman.qth.net>
> Sent: Sunday, October 23, 2016 12:17 PM
> Subject: Re: [Boatanchors] EF50 Tube
> 
> 
> Mike,
> 
> The 9-pin loctal was strictly a European thing, introduce by Philips in
> 1938.  I've never seen it supported by any tube testers on this side of
> the pond.  See: https://en.wikipedia.org/wiki/Tube_socket#Other_loctals
> 
> Might be easiest just to buy another tube fro 5 bucks:
> https://vacuumtubesinc.com/index.php/catalogsearch/result/?q=ef50
> 
> Al
> 
> Al Klase – N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
> 
> On 10/23/2016 2:44 PM, Michael Bittner wrote:
> > I'm trying to test an EF50 tube.  Radiomuseum says that the EF50 tube is 
> > "identical" to a CV-1091.  My TV-7/DU tube tester data has settings for 
> > testing the CV-1091.  However, both tubes a 9-pin loctals and the TV-7 
> > does not have a socket for 9-pin loctals, only 8-pin loctals.  What's 
> > going on here?  Help, is there some adapter that's meant for the TV-7 to 
> > allow testing 9-pin loctals?     Mike, W6MAB
> >
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