Corona Radio & Telev. Corp. 108 Schematic

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Product Information:
Model:108
Manufacturer:Corona Radio & Telev. Corp.

Schematic Pages

Schematics Content:

Page 1:

ALIGNMENT PROCEDURE
First, adj. IF transf. to 456 KC by feeding the signal thru the control grid of the 6A7 tube. Adj. the short wave band next; - set pointer at 6 MC & adj. osc. trimmer, located under chassis near filter conds. carefullly to the fundamental rather than image (fund. is second peak as you adj. from max. cap.); then adj. the short wave ant. trimmer, located on top of chassis near var. cond., for max. signal: next dial across short wave ant. trimmer, located on top of chassis near var. cond., for max. signal: next dial across short wave band checking it at 2.5 and 4 MC to see that it does not stop oscillating. If this should occur, try changing 6A7 tubes to find one that will oscillate at 2.2 MC. If you experience any difficulty in finding a satisfactory tube, it may be necessary to use separate bias on 6A7 (200 ohm res. and .1/4 mfd cond.) in order to use the tubes available.
Now, set band switch to broadcast position and adj. padder at about 600 Kc for max. gain, rocking the var. cond. with each adj. of the padder - then with gang all the way open, adj. B.C. osc. trimmer located under chassis near outer edge, to 1717 KC and set B.C. ant. trimmer located on top of chassis near outer edge, for maximum gain.
This set is designed to operate on 105-125 volts AC-DC.
DO NOT CONNECT A GROUND TO THIS SET.

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