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Old 5th February 2006, 10:52 PM   #1
Emnitec is offline Emnitec  Sweden
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Default Projects involving EF50 tubes?

Hello all!

I'm all new here and rather new to the diy-community. My experience is building effectpedals so I have very little knowledge about tubes, but I'm in process of learning now..

So, I've found a whole box of different NOS tubes at my work and most of them I recognise from schematics I've seen, but then I have a great amount of EF50 tubes that I've never seen in any schematics?

Do u people know of any project(s) with this tube involved?? I would be glad if someone could direct me or tell me a little more of what this tube could be good for...

Thanks in advance!


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Old 5th February 2006, 11:15 PM   #2
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Howdy, Found data on the 1958 mullard ef50 @ Frank Philipse home page. Hit the Gdansk University of Technology link. Its a single ended RF pentode with a 6.3 volt heater. Hope this helps.
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Old 5th February 2006, 11:56 PM   #3
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The EF50 was a very common RF pentode, found especially in military equipment. I have never heard of its use in audio work and I don't know whether it's linear enough to do a reasonable job; so many RF pentodes aren't suitable for audio. It may even be remote cut-off, for all I know, which would make it unsuitable.

If it is applicable to audio, its use would be confined to small signal amplification, in either pentode or triode mode, or as a constant current source/sink. It's rather bulky and there are plenty of other popular tubes for these purposes, so that maybe why it's never applied to audio.
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Old 6th February 2006, 01:15 PM   #4
Emnitec is offline Emnitec  Sweden
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Hello!

Thanks for the answers! It was as I suspected, not the mostly used tube for projects. But I let them rest in the box for future possible use.

And, this seems to be a really helpful and "mature" discussion-board. I'm glad I found it!!!



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Old 6th February 2006, 01:46 PM   #5
adalin is offline adalin  Sweden
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please post a list of the tubes you found
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Old 6th February 2006, 04:20 PM   #6
Emnitec is offline Emnitec  Sweden
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....and the list is..:

Philips EF50 : 20 st
Philips miniwatt ECL11 : 8 st
Philips miniwatt 6V6GT : 11 st
Philips EF95 : 2 st
Philips 90AV : 2 st
Philips 866A DCG4/1000G: 7 st
Philips 5894 QQE06/40 : 3 st
Philips miniwatt EAA91 : 2 st
Ediswan D.L.S 15 : 2 st
Telefunken ECL11 : 4 st
Brimar 6V6GT : 6 st
General Elect. 6V6GT : 6 st
Zaerix EF50 : 1 st
Triotron 6AU6 : 6 st
Sylvania 6AU6WC : 1 st
LM Ericsson 5591/403B : 2 st
LM Ericsson 6J6 : 8 st
LM Ericsson 6761: 5
Lorenz ECC81 : 3 st
BRIMAR 807 : 4 st


All unopened....but there are some diodes and so that I'll probably never will use...



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Old 6th February 2006, 06:02 PM   #7
adalin is offline adalin  Sweden
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You could build a nice PP amp with the 807 as powertubes, and ecc81 as phasesplitter perhaps.

The 866A are mercuryrectifiers, contains mercury

If you dont want them I can buy some from you. Ive been looking for some of them for an amp im building
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Old 6th February 2006, 06:31 PM   #8
Emnitec is offline Emnitec  Sweden
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Is it the 807 tubes you were interested in? I'll heard good things about these so I will probably keep them. As far as building I'm first of all planning to build a guitar amp, but as I progress in learning I will certainly try anaudio amp...



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Old 6th February 2006, 07:35 PM   #9
adalin is offline adalin  Sweden
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no the 866A

807 you can keep, build something with them..
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Old 6th February 2006, 07:57 PM   #10
alex278 is offline alex278  Netherlands
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On a side note, what could you do with the EF80? I've got loads of these....
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