Transmitting Variable Inductors

Roller Inductor
0.1 - 18 µH

(IRV) 406-18
LaPointe roller inductor. 0.1 - 18 µH. 27 turns. 2" diameter x 4 inch ceramic form. Silvered roller, same as Johnson 229-202. 5 amp, 12 µH silver wire. 2-1/2" x 6" x 3" high. 4-1/2" c-c mounting holes end to end. 5/8" c-c mount holes, 0.198" diameter.
$189 each

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

Roller Inductor
0.1 - 24 µH

(IRV) 406-12
LaPointe roller inductor. 0.1 to 24 µH. 3" x 2-1/2" x 7-1/2". Removed from equipment.
$225 each

Motorized Roller Inductor
0.1 - 28 µH

Motorized Roller Inductor 0.1 - 28µH
(IRV) 406-32-M
Motorized roller inductor. 0.1 to 28 µH. with 12 vdc reversible motor with limit switches. Requires 10 sec to go end to end. 10 turn, 10k ohm pot coupled to motor to indicate position to external sense circuit. Attached PC board contains TIP140 Darlington transistors that drive the motor. Use an external 10 turn pot and TTL logic to compare with the on-board pot to control the on-board motor drivers. Roller tap tied to one end of the coil and the "N" female input connector. Easily removed. Output lead is spade lug female on lead. Ceramic form - end plates. 5-1/2" x 8-3/8" x 6" high. NOTE: This is the inductor used in the SRS-645, 1 kw tuner shown on this page. LaPoint 406-32; same as Johnson 229-203.
*** SOLD OUT ***

Edgewound Variable Inductor
1 - 28 µH / 15 amp

(IRV) P400-205
Phasetek edgewound variable inductor. 1 - 28 µH, 15 amp. 3/8" diameter shaft on each end. 6-1/2" x 6-1/2" x 10"L. Used.
$465

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

Variable Inductor
1 - 49 µH / 5 kw

(IRV) RI-49
Variable inductor. Edgewound silver coil. 1 - 49 µH, 5 kw. Includes 1/4" flex coupling. 5" x 6" high x 13-1/2" long.
$425 each

Roller Inductor
0.2 - 50 µH

(IRV) GCU1935
Roller inductor. Internal pinch roller design. 0.2 - 50 µH, 5 kw, 10 amps. Coil: 36 turns, 3/32" x 1/2" wide silver plated edgewound copper, 5-1/4" diameter. Coil is 0.094” thick. 5 turns per inch, 9" long. 5" diameter - 72XL037 sprocket on drive-end for motor. 3/8" shaft. 6" diameter x 15" long overall dimensions. Brand new!!
$449 each - $425 (3+)

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 Roller Inductor
23 µH

Edge Wound Roller Inductor 23µH
(IRV) RI-23
23 µH roller inductor. Edge wound silver coil. 25 turns. 1/4" shaft. 4" x 4 1/4" high x 4 3/4" long. New old stock, unused.
$119 each

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

Solid Copper Roller Inductor
39 µH

Solid Copper Roller Inductor 39µH
(IRV) RI-39
39 µH solid copper roller inductor. 10 amp contacts. Solid brass wiper bar. Wound with .116" x .24" copper strap. 3/8" brass shaft with brass bearing plates and slip ring contacts. 3/8" fiberglass end plates and coil form. 14" x 4-5/8" x 4" overall dimensions.
$379 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. NSN: 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

Adjustable Inductor
23 µH

(COL) 544-5984-003
Adjustable inductor on 1" x 3" ceramic coil form has 23 µH total inductance. Graduated scale marked "3-45" turns. Collins surplus. Shorting wheel on slider selects tap.
$325 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

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