Quote:
Originally Posted by Robert Gribnau
Hello Jez,
I did not ask you for free R & D service. I asked you because I could not believe you can achieve a gain of 400 with an EF86 or an EF184 at line level.
From your reaction I now understand that additional circuitry is needed. But even than I still find it hard to believe. But hey, I am just an amateur.
About the distortion of an EF86 strapped as a triode: I find it hard to understand that an EE in audio and a Chief engineer at a (now defunct) hi fi company, like you wrote you are, needs to prove to himself that those claims were false. Furthermore I do not know of any Svetlana datasheet that claimes 0,1 % at 10 V output for an EF86 in triode mode but if you say so, it must be out there somewhere.
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Well lookie here... seems I have my first troll on vintage radio.net
It is easy to achieve gain of 400 from many pentodes. No "additional circuitry" is needed. Just a high value anode resistor and no appreciable load on it.
The Svetlana web site seems to be defunct. They are now made by a different supplier and just branded Svetlana and it seems they have gone to quite some lengths to remove all links to original datasheets etc and the current datasheet I can find is different from the original one... however here is a link to the relevant information, originally on page two of the datasheet
http://users.telenet.be/tony.de.lobelle/toon/
<0.05% @ 10V RMS actually claimed.