In a message dated 7/7/2007 3:10:01 A.M. Eastern Standard Time,
kim.ostman@tut.fi writes:
Something that I've paid notice to only as of late in the 3-500Z tube
is a gradually increasing orange or light red colored glow in the
metallic cooler wings(?) as one sends CW of SSB during an "over". Is
it normal for the tube to begin glowing like that, or is something
wrong?
A. Under normal transmitting conditions at 700 to 1000 watts output it is
NORMAL for a single 3-500 tube to show such color. HOWEVER you mention the
tube shows color on an "over". I assume you mean that the amp is in standby
mode and not transmitting. In the stand by mode the tube should show NO color
it should be biased to cut off. IF... there is color shown at this time,
there is a problem in the bias circuit and it should be looked into. But
transmitting, the tube may show color and that would be normal. Lou
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