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5687 operating points DAC Kit

82.246.7.165

hi, i have made some mesure on the tube operating points first triode of the 5697 i 'v got 101V anode to grid voltage 4,7cathode voltage making a small 4mah bias
second triode : 260V anode to grid voltage , 13,5V cathode voltage making 9mah bias

when you look at the plate/voltage schematic of the 5687 you could see these operating points are not very optimal ( not linear parts of the curves) . is someone ever try to run them harder ?

cheers.

Follow Ups:

RE: 5687 operating points DAC Kit - juanitox 12:28:59 04/13/11 (1)
i finally stepped on a bias of 12mah and 250V and it sounds better to my ears like that.
the tube run hot but i stay in the normal dissipation rate.

next step feeding the first triode with a CCS load..
- RE: 5687 operating points DAC Kit - GTCharlie 04:28:09 04/26/11 (0)
  thanks for the post. "ideal" operating point often depends on what you ask from the tube ... what could be linear with just a 5-10 volts swing, could go crazy if asked to swing, say 200 volts.

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