I picked up a box of variable caps at a hamfest recently – more than I’ll use in a long time. Thus, these need new homes – all are plus shipping from 30004, or pick up in Alpharetta, Ga. Most have obviously been used, unless noted otherwise. All check good on the AADE meter here. Most include some quantity of decorative dust.
The box has more caps as well as a lot of 10-turn pots in it, too, but I’ve not checked them out yet. I’ll post ‘em once I do.
Thanks –
Steve AA4BW
Cap 1:
Dual-section air variable cap, approx 400 pf first section, approx 200 pf section second section. Plates offset on shaft. Frame measures about 3.25x2.5. Mounts via threaded holes on bottom of frame. Built-in vernier, approx. 8:1 reduction. Quarter inch shaft, cut to half-round D profile on end. Includes flange for mounting a circular dial. This is a neat cap, and the dial flange offers some good homebrewing possibilities. $8
Cap 2:
Six-section air variable cap, approx 450-24-450-24-180-24 (front to back). Frame approx 4 in. deep by 2.5 inches wide. Plates offset on shaft. Mounts with four attached spade-type bolts. Quarter-inch shaft. $6
Cap 3:
Hammarlund MC325M air variable, approx 330 pf, offset plates, ceramic and metal frame measures about 3x1.75. Mounts via two threaded feet or panel-mount. Appears new, no soldering has been done to lugs, but there is a setscrew indentation on the quarter-inch shaft. $7
Cap 4:
Hammarlund air variable, about 80 pf, brass plates. Ceramic and metal frame. Plates centered on shaft. Quarter inch shaft. Mounts via two threaded feet or panel-mount. $4
Cap 5:
Hammarlund air variable, about 40 pf, brass plates, offset on shaft. Quarter inch shaft. Ceramic and metal frame. Mounts via two threaded feet or panel-mount. $4
Cap 6:
Three section air variable, about 165 per section. Plates offset on shaft. Quarter inch shaft. Mounts via three threaded holes on bottom of frame. Frame approx. 3.5x2.5 inches. Appears to have never been used. $7
Cap 7:
Cardwell air variable transmitting cap, approx 100 pf. Plates spaced about 0.1 inch. Frame measures about 4 in. wide by 2.25 in. deep. Threaded holes on front and back of frame, presumably for mounting via spacers. Quarter inch shaft. $4
Cap 8:
National air variable transmitting type cap, about 160 pf. Mounts via two threaded holes on bottom frame or from front two threaded holes via two spacers. Ceramic and metal frame measures about 2.5x2.5 inches. Appears to be new and unused. $4
Cap 9:
Dual-section receiving type air variable. About 180 pf front section, about 440 pf rear section. Mounts in three threaded holes on bottom of frame. Quarter inch shaft. $4
Cap 10:
Single-section air variable, about 90 pf, offset plates, ceramic and metal frame measures about 1.7 in. wide by 1.7 in. deep (to back of mounting foot). Mounts via two threaded feet or panel-mount. Quarter inch shaft. $4
Cap 11:
National split-stator transmitting type air variable, configured as differential type (one section increases in capacitance as the other decreases – in other words, one set of rotor plates is 180 degrees offset from the other set). About 60 pf per section, plate spacing just under 0.1 inches. Plates centered on quarter inch shaft. Mounts via two threaded holes in bottom of frame. $7
Cap 12:
Single-section air variable, approx 14 pf. This one has brass plates, plate spacing just over 0.2 inches. Frame about 2.5 inches to back of rear mounting foot, and about 1.75 in. wide. Mounts via two threaded feet or panel-mount. $4
Cap 13:
Transmitting-type air variable, “United Scien. Lab. Scientific Low-Loss Condenser.” Measures about 50 pf. Plate spacing about 0.1 inch. Three threaded spacers on front for mounting. Quarter inch shaft. $4
Cap 14:
Transmitting-type air variable, measures about 115 pf. Plates offset on quarter inch shaft. Plate spacing a bit less than 0.1 inches. Frame measures about 1.75 wide by 4 in. (to back of rear mounting foot). Mounts via two threaded feet or panel-mount. $4
Cap 15:
Dual-section receiving type. Front section measures about 385 pf, rear section measures about 360 pf. Quarter inch shaft. Frame measures about 2.5 in wide and about 2.25 in. deep. Mounts via four threaded holes in bottom of frame. NOTE: It appears that at some point a couple of rotor plates were removed from each section, as there are a few more stator plates than rotor plates. $4
Cap 16:
Transmitting type air variable, about 70 pf, plate spacing just a hair over 0.1 inch. Very solid metal frame. Looks like it would mount with spacers in various holes in the frame. Quarter inch shaft. $4
Cap 17:
National transmitting-type, about 160 pf, ceramic and metal frame measures about 2.5 inches square. Quarter inch shaft. Plate spacing in the neighborhood of 0.05 inch. $4
Cap 18:
Panel mount air variable. About 60 pf. Mounts in hole with control nut. Quarter-inch shaft. $3
Cap 19:
Receiving type air variable. Three sections of (from front) about 90, 220 and 520 pf. A terminal block is soldered on the back frame. Quarter-inch shaft. Mounts via three threaded holes in bottom of frame. $4
Cap 20:
About 25 pf panel-mount variable. Mounts in single hole with control nut. $3