18
For easy soldering, pre-form D16 leads as shown. Also, pre-tin the leads with a
generous amount of fresh solder:
Figure 26 D16 form leads
Zener Diode Bias
There is no question that using as much positive cathode bias as possible, within limits of IMD,
makes the tubes run cooler. These graphs from AL811H amplifier tests show increased bias
reduces tube anode heat far more than reducing power can reduces tube heat:
Figure 27 Drive vs. Dissipation for various conditions
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