11.15 or 10.40 is the static slope is defined as a measure of the amplification of the tube for a certain point on the characteristic curve, which lies in the approximately linear characteristic curve, as S = ?IA / ?UG in mA / VHi Adrian, these are the original EH matched pair selected by Jadis for my amp. These died suddenly. And there are 2 sets of measurements in each tube. Would you know what these are, like plate voltage, etc?
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Thanks Adrian. A3 and B3 indeed are the tube socket positions posted in their manual.129.4 is probably the plate current in mA. B3 probably marks the position of the tube on the amp. Don't know what 11.15 means, but the date of manufacture is sometimes indicated by year and week. Therefore, this could mean 15th week of 2011 (since the other is 10.40, probably 40th week of 2010).
Thanks for your inputs, Stephan.11.15 or 10.40 is the static slope is defined as a measure of the amplification of the tube for a certain point on the characteristic curve, which lies in the approximately linear characteristic curve, as S = ?IA / ?UG in mA / V
grid voltage and anode current determine the gain pic exsample View attachment 87973
my pleasure, "S" not so important in a pushpull amplifier design, because you hear the sum of all tubes in chanel in fixed bias pushpull amps there are often symmetry potentiometers to compensate for the perfect.Thanks for your inputs, Stephan.
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