International Ind. KR20 Schematic

International Ind. KR20

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Product Information:
Model:KR20
Manufacturer:International Ind. (Kadette)

Schematic Pages

PNG: Page 1 Rider Manual Volume 10

Schematics Content

Page 1:

NOTE: SOCKET VOLTAGES TAKEN TITA 2000 OHMS PER VOLT METER FROM TUBE PRONGS TO CIRCUIT GROUND.
LINE 115 VOLIS. VOLUME CONTROL FULL ON 10% VARIATION ALLOWABLE.

NOTE: THESE PARTS ARE INTERCHANGEABLE ON MODEL KR - 20 BUT MUST BE CONNECTED AS SHOWN.

ALIGNMENT MODEL KRC -2
I.F. TRIMMERS: Feed. 1570 Kc. modulated signal from signal generator directly to entonna of Tunemaster. Adjust both IF trimmers to maximum reading on output meter. Then adjust output coil trimmer to maximum.
R.F. TRIMMERS: Set Tunemaster dial at 1500 kc. and feed 1500 kc. signal from signal generator to Antenna of Tunemaster. Set antenna trimmer approximately 1/4 turn from tight. Peak oscillator trimmer at 1500 kc. Set dial at 600 kc. and peak series oscillator trimmer. Move dial and series trimmer simultaneously by small amounts so as to get maximum output at 600 kc. Tune back to 1500 kc. and peak oscillator trimmer. Repeat previous peaking of series trimmer at 600 kc. Retune to 1500 kc. and peak oscillator trimmer. Set dial at approximately 1400 kc. Tune signal generator to resonance with Tunemaster. Then peak antenna trimmer.

ALIGNMENT MODEL KR 20
I.F. TRIMMERS: To align the I.F. circuits, set the signal generator to 446 Kc. and feed it a modulated signal direct to the antenna. Adjust the first I.F. transformer trimmers for maximum meter reading. Go over both adjustments at least three or four times for accuracy. Repeat this process on the second I.F. transformer. If adjustments are not made accurately, selectivity will be poor and I.F. oscillation may result.
R.F. TRIMMERS: Turn the dial to 1500 kc. and feed a very weak 1500 kc. modulated signal from your signal generator to the antenna. Adjust the oscillator trimmer for maximum reading. Then peak the antenna trimmer to this setting. Aligning of broadcast band should be done on 1500, 1000 and 600 kilocycles. There is no adjustable padder condenser in this model so resonance on lower frequencies is accomplished by bending plates on tuning condensers,