Transmitting Variable Inductors

Motorized Roller Inductor
18 µH

Motorized Roller Inductor 18 µH
(IRV) 640333
Motorized roller inductor. 18 µH. 12 vdc reversible motor with limit switches. Requires 13 sec to go end to end. 10 turn, 10k ohm pot coupled to motor to indicate position to external sense circuit. Roller tap tied to frame ground. Easily removed. Ceramic form - end plates. 5" x 7" x 4" high. Removed from new, unused SRS SR-640 tuner. NOTE: This is the same size inductor used in Lew McCoy's ultimate transmatch.
$295 each

RF Grade Fiberglass Grooved Spool

RF grade fiberglass grooved spool. Non-linear spacing. Silver endposts. 2-7/8"D x 4-1/2"L winding area.
$25 each

Variable Inductor
1 - 30 µH / 10 amp

(IRV) 400-206-5
CSP variable inductor. 1 - 30 µH, 10 amp. 3/8"D shaft. 7-1/4" x 7-1/2" x 10-1/2"L. Used.
$425 each

Gates Edgewound Inductor
1 - 17 µH

Gates Edgewound Inductor
(IRV) 17-VC-15V4
Gates edgewound inductor. 1 - 17 µH, 20 amp. 3/8" shaft. Removed and old. (1950's). 6" x 11"L x 6-1/2"H.
*** SOLD OUT ***

Edge Wound Variable Inductor
35 µH

Edge Wound Variable Inductor 35 µH
(IRV) RI-35
35 µH, edge wound silver coil, opposing gripper contact arrangement for reliable service year after year. 40 turns. Edgewound ribbon coil. 4" x 5-5/8" long x 4-1/4" high. 1/4" shaft. New old stock, unused.
$145 each

Roller Inductor
0.1 - 6 µH

(IRV) RI-6
Collins roller inductor with insulated coupling. 0.1 - 6 µH. 4" x 2-3/8" x 2-3/8". 19/32" x 1/4"D shaft. Collins P/N: 546-6435-002.
*** SOLD OUT ***

Roller Inductor Replacement
Wheel & Bar

(IRV) K57J58-G1
Roller inductor replacement wheel & bar. Silver roller with ball bearings inside!! Ribbon wire tie-offs on end. 1-3/16" diameter wheel made for 1/8" diameter inductor wire. Made by G.E. in 1945. 7-3/4" x 3/16" diameter shaft.
$15 each

Variable Inductor
12 µH

(IRV) RI-12
All silver plated. Looks like it should handle 20 - 30 kw. 8 turns 3/8" diameter tube coil. 3/8" shaft coupling included. 9" diameter x 13" long. Excess from SRS.
*** SOLD OUT ***

Roller Inductor Wheel

(IRV) 7809266P2
Westinghouse roller inductor wheel. Silver plated bronze. TPE transmitter spare. 0.938" diameter. 0.863" inner groove diameter. 0.2" bore diameter. 0.5" long. Westinghouse item 284, 293.
$9.75 each

Core Roller Inductor
0.3 - 35.8 µH

Core Roller Inductor
(IRV) 2434
Nice ceramic core roller inductor. Shaft end has slot to mate with nylon quick coupling (shown right) which fits 1/2" shaft. Little or no previous use. Electrical connections are made to ribbon conductors opposite shaft end. Mounts on bottom with 4 screws, 2 in each of the green composite end plates. 3" x 3-1/2" x 5-1/2". Composite RF material. Stand alone frame, silver plated kilowatt roller coil, as new, removed from (IRV) 503178 auto tuners found in Vacuum Variable section.
$99 each

Sliding slotted coupling mates with female on end of
inductor and automatically recovers from missalignment

Close-up of slotted shaft on end of inductor.

Close-up of 1/2" diameter female end of nylon
coupling that is supplied with 2434.

Roller Coil
0.4 - 20 µH

(IRV) N16C-76423
Surplus heavy duty ceramic core roller inductor. 8-1/2" maximum length, 4-3/8" x 5" high. 1/4" shaft two ends. Should handle 3,000 watts.
*** SOLD OUT ***

Square Edgewound
Wire Inductor / 0.5 - 11 uH @ 20 amps

(IRV) 226-005-22
Identical to left but 10" max. length. 3/8" shaft. Includes 30 kv, 1/4" shaft coupling. Made by Multronics, Inc.
*** SOLD OUT ***

Gear Motor
24 vac / 28 rpm

(IRV) B00003
Brevel Products gear motor for operating rotary switches. 24 vac, 28 rpm. It has a spring loaded pawl that retracts when power is applied and engages when power is removed to stop the motor. Plenty of torque due to gear reduction. NOT REVERSIBLE.

Mounted in a 4-1/4" x 3-1/2" x 5"H aluminum frame with mounting tabs. Motor measures: 2-5/8" x 3-1/4" x 4". 1/4"D shaft.

$59 each

70 rpm Loaded Speed
Reversible Gear Motor

(MOT) B00005
24 vac (50/60 Hz) operated motor is used in the SRS Antenna Couplers to tune inductors, switches and vacuum caps.

Healthy torque manages any component in their line. 70 rpm at 24 vac 60 Hz, with full rated load. Lower voltage to lower speed also decreases torque. Double 1/4" shaft exits each side of gearbox. Mounts by threaded post sockets on front spaced in a 1-9/16" square.

Max dimensions 3-3/4" high x 2-7/8" wide x 3-1/2" deep from mounting posts to electrical terminals on back. MK Model QFS3420R. Includes starting cap and wiring instructions.

Limited quantity!

Suitable for almost any remote tuning application of a vacuum cap, rotary inductor or ceramic switch.

$79 each

Motorized Rotary Inductor
25 µH

(COL) 635-9851-004
Collins / Rockwell motorized rotary inductor. 25 µH. Handles 500w to 1 kw. 1/8" diameter gold plated inductor. 27.5 vdc motor drive. 20k, 10 turn pot attached for high resolution position indication. Maximum dimensions 6-3/8" high x 5-1/4" wide x 8" long. Complete with Collins acceptance tag. Brand new in the box!!
*** SOLD OUT ***

Variable Inductor End Stop Kit

End stop kit for (IRV) RI-40 previously sold by Surplus Sales
$35 each