Over on the Antique Radio Forum, Steve “azenithnut” mentioned he was missing the high frequency coil for his Heathkit GD-1250 Grid Dip Oscillator.
His GD-1250 is missing this coil. I thought I’d post some photos of the coil from my GD-1250. Perhaps Steve can fashion a replacement from the photos.
The coil is a single-turn hairpin loop.
The coil is about an inch long, if you subtract the threaded portion of the RCA phono plug.
The coil is shaped something like the end of a cotter pin. The straight side is soldered to the shield of the RCA phono plug. The other side has an S-curve that brings the loop in to meet the center pin of the PCA phono plug.