K3JRR-AVC

AIR-DIELECTRIC VARIABLE CAPACITORS

AVC-01: Tested December 21, 2020. Two capacitors on a single shaft, 0.07-inch spacing. 20 pF to 112 pF. Manufactured by National, no part number on the capacitor or frame, but found in a box labeled “80858”.

AVC-02: Tested on December 21, 2020. Two identical capacitors on a single shaft in 1 frame. includes black knob and alligator clips as shown. Both capacitors measure at 74 to 900 pF. Manufactured by Caldwell, but no part number visible. Some slight green discoloration on brass frame, but not on capacitor fins.

AVC-03: Tested December 21, 2020. 28pF to 500 pF. Manufacturer unknown, but stamped with part number 731 454.

AVC-04: Tested on December 21, 2020. 40pF to 230 pF. Stamped with part number 02236, and hand-engraved with number 024.2. Manufacturer unknown. Appears to need some sort of “lock” or gear (see this photo).

AVC-05: Tested December 21, 2020. 30 to 240 pF. Stamped with part number 02236, and hand-engraved with number 024-2. Manufacturer unknown. Appears to need some sort of “lock” or gear (see this photo).

AVC-06: Tested December 21, 2020. 38 pF to 185 pF. Rated to 4500 volts.

AVC-07: Tested December 21, 2020. Dual identical capacitors on a single shaft. National Radio, no part number visible, 0.25-inch spacing, Both capacitors measure at 10pF to 65 pF . Includes ceramic standoffs as shown.

AVC-08: Tested December 21, 2020. Dual capacitors on a singl shaft. Front: 30-220 pF. Rear: 28 to 195 pF. 0.15 inch spacing. Manufactured by Cardwell, but no part number visible. Frame has some slight green discoloration from oxidation of copperin the brass frame (not the fins).

AVC-09: Tested December 21, 2020. Dual capacitors on single shaft. Front: 37 to 114 pF Rear: 60 to 120 pF. 0.20-inch spacing, rated to 7500 volts. Manufactured by Bud, but no part number visible. Includes black knob and ceramic standoffs on one end as shown in photo.

AVC-10: Tested Dec 21, 2020. Dual capacitors on single shaft: Front: 40-135 pF. Rear: 24 to 66 pF

AVC-11: Tested December 21, 2020. Measured at 17 pF to 280 pF.

AVC-12: tested December 21, 2020. Some slight green discoloration on frame, but not on fins. Measured at 0.0 pF to 185 pF. Manufactured by Cardwell, but no part number visible.