[Boatanchors] EF50 Tube

[Michael Bittner]

I am ignorant on how my TV-7 tube tester works.  I just follow the switch 
settings given in the TV-7 data book and read the meter which has a zero to 
120 scale.  Comparison of the meter reading with the minimum acceptable 
reading given in the data book indicates whether the tube should be kept or 
replaced.  The switch settings for the EF50 (alias CV-1091) given in the 
TV-7 data book are: FILAMENT B, FILAMENT V,  GRID 7,  PLATE 3, SCREEN 2, 
CATHODE 6, and SUPPRESSOR 8. BIAS SETTING 8, METER RANGE 3, MINIMUM 
ACCEPTABLE METER READING 40.  I don't know if all this is helps or not. 
Mike, W6MAB
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----- Original Message ----- 
From: "Jacques Fortin" <jacques.f at videotron.ca>
To: <hwhall at compuserve.com>; <mmab at cox.net>; <boatanchors at mailman.qth.net>; 
<ark at ar88.net>
Sent: Sunday, October 23, 2016 3:55 PM
Subject: RE: [Boatanchors] EF50 Tube


Excuse my ignorance, but does the TV-7 tester works similarly, with 
settings, to the Hickock / Stark tube testers of if it is a parametric one 
(given nominal transconductance value for a defined set of bias parameters, 
like the AVO testers) ?
I can provide setting values for both cases.

73, Jacques, VE2JFE

-----Message d'origine-----
De : Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] De la part de 
hwhall at compuserve.com
Envoyé : 23 octobre 2016 17:09
À : mmab at cox.net; boatanchors at mailman.qth.net; ark at ar88.net
Objet : 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
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----- 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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