Air Variables: Differential & Split Stator

Differential variable capacitors have two independent stators, but unlike in the butterfly capacitor where capacities on both sides increase equally as the rotor is turned, in a differential variable capacitor one section's capacity will increase while the other section's decreases, keeping the sum of the two stator capacitances constant. Differential variable capacitors can therefore be used in capacitive potentiometric circuits.
Differential Air Variable Capacitor
2.0 - 9.3 pF @ 1250v
(CAV) 160-305
Differential air variable capacitor. 2.0 -9.3 pF @ 1250v, 3/16" shaft, break away plates, bushing mount. In a differential, one capacitor section decreases while the other increases.
*** SOLD OUT ***
Split Stator Air Variable Capacitor
2.7 - 19.6 pF
(CAV) 160-311-1
Split stator air variable capacitor. 2.7 - 19.6 pF, 3/16" shaft, breakaway plates bushing mount.
$15 each - $12.75 (3+)
Differential Air Variable Capacitor
12 - 54 pF Each Section
(CAV) SA4082
National differential (one section makes while the other section breaks) air variable. 0.030" plate spacing for 1250v. 1/4" x 3/8" long shaft, double bearing. Mounts by bushing at shaft or by threaded holes in base. 2-1/4" max width, 2-1/2" max height. 2-1/4" depth behind bushing.

Plates are tapered for uniform capacity distribution during rotation. Complementary tapers increase capacity in one section while decreasing in other. Rotor is grounded at shaft end plus has a brush at rear. Each stator floats. New in boxes.
$59 each
Split Stator Air Variable Capacitor
11 - 100 pF Each Section
(CAV) JB100-2
Jackson Brothers split stator air variable capacitor. 11 - 100 pF each section. Double ball bearings, silver plated. 3-5/8" plate to plate length. 2-1/8" x 2/1/8". 0.048 (2kv) plate spacing. 1/4" x 1" front shaft. 1/4" x 1/4" rear shaft. Actual P/N: 5021/SS/6DB (Jackson Brothers).
$99 each
Motorized Differential Capacitor
15 - 300 pF / 3 kv
(CAV) MD300
Motorized differential capacitor. 15 - 300 pF, 3 kv. 12v DC reversible gear motor, 1 : 500. Limit switches on full open and close. 3-1/2"W x 3-3/4" x 15" overall length. Like new condition. Only 1 available.
$299
Motorized Differential Capacitor
8 - 600 pF / 2 kv
(CAV) MD600
Motorized differential capacitor. 8 - 600 pF, 2 kv. 12v DC reversible gear motor, 1 : 500. Limit switches on full open and close. 3" x 3-1/2"H x 13" overall length.
$175 each
Motorized Split Stator Capacitor
25 - 800 pF
(CAV) MD800
Motorized split stator capacitor. 25 - 800 pF. Working voltage stamped 1.5 kv. Our calculation for 0.06" is 2.5 kv. 12v DC reversible gear motor. Limit switches on full open and close positions. 4" x 4" x 12" overall length. 0.06" plate spacing. Like new condition. Only 1 available.
$249
Motorized Differential Capacitor
30 - 1000 pF / 1.5 kv
(CAV) MD1000
Motorized differential capacitor. 30 - 1000 pF, 1.5 kv. 12v DC reversible gear motor, 1 : 500. Limit switches on full open and close. 3-1/2" x 3-1/2" x 17" overall length. Only 1 available.
$325