Dan --- When a 3-500Z's grid fusing resistor blows, either the tube is
loosing it's vacuum, the anode cooler spot-welds have broken (allowing
loose anode to contact grid), or there has been an intermittent VHF
oscillation which produced a surge in grid-I. A purple/blue glow
suggests that there's air inside the tube. cheerz
On Sep 12, 2004, at 7:44 PM, Dan Sawyer wrote:
All,
Recently one of grid resisters blew on an SB-220. The result was the
tube glowed deep red to purple. Is this a reasonable outcome for a
blown grid resistor on an SB-220? If the incident was only a few
seconds long was the tube damaged??
Thanks,
Dan
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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