I have a homebuilt amplifier with 2 8112 tubes running in AB1, the
amplifier are working nicly on all bands exept 160m. On this band as the
tubes get hot during transmission the loading sems to get heavier an
heavier and I have to retune the amplifier during transmission to avoid
exceed screen curent when I start to transmitt. It behave like this on
any antenna and with every rig driving it. Do anyone have an idea wath
couse the problem?
73 Ken
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