24-03-2018, 07:48 PM
Lou,
You wrote: "I venture inside that tube is a trimpot, possibly 25K."
Nope. No trimpot. Re-visit the schematic diagram. There is a tube with an adjustable sleeve (shown as distributed capacitance in the schematic diagram) in which a FIXED resistor resides.
Something that has become evident in my recent investigations is that Bird slugs differ markedly in their detailed workings, depending on band and power level.
Chas
VK3PY
You wrote: "I venture inside that tube is a trimpot, possibly 25K."
Nope. No trimpot. Re-visit the schematic diagram. There is a tube with an adjustable sleeve (shown as distributed capacitance in the schematic diagram) in which a FIXED resistor resides.
Something that has become evident in my recent investigations is that Bird slugs differ markedly in their detailed workings, depending on band and power level.
Chas
VK3PY