Breting Radio Mfg. Co. 12 Schematic

Breting Radio Mfg. Co. 12

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Product Information:
Model:12
Manufacturer:Breting Radio Mfg. Co.

Schematic Pages

PNG: Page 1 Rider Manual Volume 6

Schematics Content

Page 1:

BRETING RADIO: MFG: CO.

Model 12 Schematic Alignment

REBALANCING
A good all wave oscillator and a crystal oscillator are required.

1 - Balance the 1.F. by placing the crystal in an oscillating condition and connecting a short wire to the grid terminal of the first detector. Diminish the output of the oscillator by either a gain control or moving the oscillator from the receiver until a reading of about R 6 is indicated on the " R " Meter. Carefully adjust the trimmer screws on each I.F. and the crystal unit both above and below the chassis until maxi. mnum indication is noted on the R meter. Under no condition unless the receiver has been tampered with should any of the trimmers require more than a quarter of a turn for maximum peak.

2 - Balance the Broadcast and High Frequency bands by connecting the output of the all wave oscillator to the antenu and ground posts. Turn the oscillator 10 1400 K.C. and be sure the dial pointer roads 1400 K.C. Adjust trimmer as shown on diagram (rear section) until the oscillator note is heard in the speaker. This denotes that the oscillator section of the receiver is aligned correctly at that frequency. Change the oscillator to 600 K.C. and tum dial pointer to 600 K.C. Adjust padding condenser indicated on the diagram until the oscillator is again heard in the speaker. If the receiver was very far off it will be necessary to recheck 1400 K.C. again.

3 - Diminish the output of the oscillator until the " R " meter reads " R 6 and then carefully adjust the two trimmers marked 1400 K.C. until maximum swing has been Johtained on the " R " meter. Adjust the balance of the bands in the same way using the points and trimmers indicated on the diagram. A little thought and study of the layout of the receiver will be of great help.