Projects involving EF50 tubes?

Emnitec · 5th February 2006, 10:52 PM

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!

/Emnitec

jaymanaa · 5th February 2006, 11:15 PM

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.

ray_moth · 5th February 2006, 11:56 PM

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.

Emnitec · 6th February 2006, 01:15 PM

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!!!

/Emnitec

adalin · 6th February 2006, 01:46 PM

please post a list of the tubes you found

Emnitec · 6th February 2006, 04:20 PM

....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...

/Emnitec

adalin · 6th February 2006, 06:02 PM

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

Emnitec · 6th February 2006, 06:31 PM

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...

/Emnitec

adalin · 6th February 2006, 07:35 PM

no the 866A

807 you can keep, build something with them..

alex278 · 6th February 2006, 07:57 PM

On a side note, what could you do with the EF80? I've got loads of these....

5th February 2006, 10:52 PM	#1
Emnitec diyAudio Member Join Date: Feb 2006 Location: Sundsvall	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! /Emnitec

5th February 2006, 11:15 PM	#2
jaymanaa diyAudio Member Join Date: Jan 2006 Location: Kansas	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. __________________ "Make everything as simple as possible, but no simpler" Einstein

6th February 2006, 01:46 PM	#5
adalin diyAudio Member Join Date: Jun 2004 Location: Gotenburg	please post a list of the tubes you found __________________ Tubes 4 ever

6th February 2006, 06:02 PM	#7
adalin diyAudio Member Join Date: Jun 2004 Location: Gotenburg	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 __________________ Tubes 4 ever

6th February 2006, 07:35 PM	#9
adalin diyAudio Member Join Date: Jun 2004 Location: Gotenburg	no the 866A 807 you can keep, build something with them.. __________________ Tubes 4 ever


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5th February 2006, 11:56 PM	#3
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	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.

6th February 2006, 01:15 PM	#4
Emnitec diyAudio Member Join Date: Feb 2006 Location: Sundsvall	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!!! /Emnitec

6th February 2006, 04:20 PM	#6
Emnitec diyAudio Member Join Date: Feb 2006 Location: Sundsvall	....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... /Emnitec

6th February 2006, 06:31 PM	#8
Emnitec diyAudio Member Join Date: Feb 2006 Location: Sundsvall	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... /Emnitec

6th February 2006, 07:57 PM	#10
alex278 diyAudio Member Join Date: Sep 2005	On a side note, what could you do with the EF80? I've got loads of these....

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