by Ty_Bower » Tue Apr 20, 2010 7:37 pm
The 6L6GB is a 20 watt tube. You might consider biasing it a little lower to try to keep dissipation under that. The stock Stereo 70 biases the tubes to 50mA at 410 volts, for something just over 20.5 watts per tube. I'd like to see the 6L6GB driven around 70% of its max rating, so maybe try for 35mA per tube. Keep in mind that B+ voltages will creep upwards as you bias the tubes lower.
The 6L6 has a maximum plate voltage rating of 360, and a screen voltage rating of 270. You will easily exceed those limits. Although they are beautiful tubes, I wouldn't recommend trying them in a Stereo 70.
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