. QST . PROFESSIONAL ROTARY INDUCTORS ...adjust that L/C ratio for topperformance at any frequency! Now, for peak efficiency from pi-networks and other tank circuitschoose one of these popular John-son variable inductors for yourequipment. Two new models nowovailable, both variable pitchwound with heavy No. 12 wire —for AM transmitters operating upto 500 watts or for SSB trans-mitters up to a full kilowatt. Wind-ings mounted on grooved steatiteform —contact wheel is springloaded to provide smooth, reliableinductance variation throughoutthe entire range. Time-tested byamateurs the country over,
. QST . PROFESSIONAL ROTARY INDUCTORS ...adjust that L/C ratio for topperformance at any frequency! Now, for peak efficiency from pi-networks and other tank circuitschoose one of these popular John-son variable inductors for yourequipment. Two new models nowovailable, both variable pitchwound with heavy No. 12 wire —for AM transmitters operating upto 500 watts or for SSB trans-mitters up to a full kilowatt. Wind-ings mounted on grooved steatiteform —contact wheel is springloaded to provide smooth, reliableinductance variation throughoutthe entire range. Time-tested byamateurs the country over, thesedependable Johnson inductors areyour best buy. Available at Electronic PartsDistributors New 25 uh unit wound with^12 tinned copper wire. 229-203 $ Amateur Net New 15 uVi unit wound withii2 tinned copper wire. 229-202 $ Amateur Net 10 uh unit (os used in John-son Vil<ing II) wound with,*14 tinned copper wire. 229-201 $ Amateur Net
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
