It has been noted that the 3-400 has a lower plate dissipation than the 3-500.
However, it is not quite that simple. The dissipation is controlled by the air
blowing by, and both the power supply and the air will limit the power
dissipation of the amplifier.
The power dissipated by each tube is roughly the input power, less the output
power, divided by two. The amount of heat withdrawn from the amp is controlled
by airflow and will be roughly the same for each tube. My experience with both
the Drake and Heat series is that they like to run at about 1200 - 1300 watts
output, and will do so for a long time.
So long as the 3-400 tube is operating within limits, it will work the same as
the 3-500 tube.
73, Colin K7FM
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