The Russian symbol for what you are calling an n looks a bit like pie. It's like two capital I's but the top two outriggers are joined II. I have to be this pedantic because the VAde Mecum lists it by it's proper symbols not by what it has been converted to for the benefit of American dominated internet language. My book predates the internet so it calls things by what they are, not by what Americans think they should become.colin.hepburn wrote:Hi PaulPaul Barker wrote:The bad news is I can't find Rosenblit book.
The good news is I found my Electronic Universal Vade-Mecum, so if anyone wants a spurious valve looking up that they can't find the data on anywhere else pipe up.
Don't suppose you can shad some light on the true data of this Russian 6P3S/6n3C cant seen too fine a consistent spec on this valve
some say for example anode voltage is anything from 250/500volt and cathode anything from 44mA to 72+_18 Equivalents of 6L6 6L6GT they say but who knows any ideas
http://ussr-tubes.com/index.php?main_pa ... cts_id=307
It is only listed as an equivalent of the 6L6. All the curves on the relevant page show 6L6 and all the suggested operating criteria are for 6AH5G, 6AL6G, 6L6, 6TP, IILL6, and 1631.
The 6L6 maximums are listed as
Triode connected 275v 12.5 watts anode dissipation.
Tetrode Anode 360v g2 270v 19 watts anode dissipation
As such tetrode connected maximum single ended power out operating point anode 350v g2 250v bias -18v for 10.8 Watts (15% thd)
Triode connected they only show 250v -20v bias which gives a pathetic 1.4 watts at 300v -20v bias it would give 1.8 watts but it is above ratings. (5.5% thd)
Seems a bit pathetic. Your KT66 has
Triode 400v -38v 5.8 watts 7% thd
or 250v -19v 2.2 watts 6% thd
It is often likened to the PX25, so to give you the comparison
PX25 at 400v -31v 3k2 load 6 watts 6% thd
or 500v -45v 5k5 load 8.5 watts 7% thd
tetrode 250v 250v -15v 7.25 watts 9% thd.
Therefore 6L6 is better suited to tetrode operation and kt66 more suited to triode operated, when working single ended.
Push pull is entirely different.