SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

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RE: SUN SV 2A3 stereo SE amp .... MEASUREMENTS

Posted by Wojciech on March 31, 2015 at 05:56:06:
I built Sun 2a3 kit for my friend years ago substituting 2a3 with VT52 which he had in his tube stash. It was my first encounter with VT52 and it's a truly lovely tube. For whatever reason , (actually ever since I owned once Audio Note Quests ) I like plain vanilla 6SN7 cascade driver.I heard many supposedly more refined , better designs but still fond of that "pedestrian" design .
Here is what Zoran from Belgrade wrote regarding SUN 2A3 amp (courtesy of Diyaudio.com , and I hope he doesn't mind"..

..."sorry but that from sun audio is not good at all
first, the value of pot 100k is too high for the 6sn7
right value if pot required is 25K...
next the values of Rload at anodes of 6sn7
are too high value.
The load line will be almost horizontal.
and the drop of voltage is probably large,
so the resulting Va will bi lower voltage,
against higher voltage that
should be like Va when we talk about the 6sn7...
next, the device will have more than sufficiant gain,
like common fassion in that design, so the pot most
of the time will be at lower positions causing loss of highs.
*
that is from the first sight cheers"...