Hi !!
I have been using my AL-80A for years without trouble. Sudenly, during
last WPX, the amplifier stoped because thes fuse blowed. After restoring
the fuse I observed that the 3-500Z showed blue color (gas?) at top, so
I replaced the tube as well. No other symptom and all components seemed
to be intact
When starting with the new tube i observed the grid current and ip
current indicators going full scale when transmiting with very low
power. The wattmeter shows normal output power.
After looking at the reflector I replaced the 1n4007 diode because it
solved the problem when experiencing similar situations. After this ip
current indicator goes full
scale even if I don't transmit (Grid meter indicates zero). If I apply
normal drive the grid current and ip current indicators go full scale
again. The wattmeter shows normal output power.
Any idea?
Thanks in advance
Marcel, EA3IN
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