Yes many times tried. They used to be easily available and really cheap. You can also see a THD chart using those in the NFB version preamp link from post#1.
Not the most reliable as we chanced on noisy units easier than with other NOS but generally a well compatible USSR era clone and easy on the ear.
Not the most reliable as we chanced on noisy units easier than with other NOS but generally a well compatible USSR era clone and easy on the ear.
i bought a lot of them for $1 each, 12en6, along with the 12w6 beamers...i assumed that there could have been a 6 volt version... https://tubedata.wernull.com/sheets/127/1/12EN6.pdf
do not let its plate dissipation ratings bother you...i made a pp amp out of pairs of these many many years ago...
how did it sound? a lot better than a 6v6 to my ears...
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I agree with @Lingwendil and would not remove the output coupling cap. There’s component-killing amounts of DC there without it.
And a properly-sized coupling cap is transparent, so why open yourself to expensive mistakes?
And a properly-sized coupling cap is transparent, so why open yourself to expensive mistakes?
Has anyone built this and tried to drive 2 power amps for bi-amping? I have a Korneff 45 for my Lowther horns and a Dayton Audio DSP plate amp for my sub. I know the Moreplay mentioned has 2 outputs with just a 220-ohm series resistor. It may sound like a silly question but I have a 6SN7 preamp right now that will NOT drive parallel loads no matter what I try (Y at first amp, Y at preamp, second output with current limit resistor, etc.) I want to make sure it will drive both before I build this. Thanks! 
The G3X version exhibits about 1kΩ output impedance. Thus its wise not to put it drive less than 10k combined input impedance power amps. In such a case its good to up the value of Co from 2.2uF to 6.8uF-10uF too. For retaining original infra-bass response & phase. The cathode follower unity gain version exhibits 250Ω output impedance.
Today I installed in my system the 6v6 salas preamp.the preamp is not mine,actually is the prototype.Amplifier is Leben cs1000p with genalex reissue kt66 tubes.speakers are diy salas bliss.What a sound!amazing!I must build one very soon!my system has never sounded like that before.Bravo Nick!
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Hi to everybody. I started to read this 3d years ago, up to page 10 more or less. Then stopped self building audio gear Now i come back and there are 245 pages!!! Whow!. It's great! But can somebody update me on the last agreed circuit and schematic. I'm an old folk, so i will stick to tube unregulated B+, and point to point, but I'm very curious to finally build this preamp and need to know about last news!
Thanks to anyone updating me!
@Salas you started it and been here all this time! Fantastic!!! Thanks!!!