Patterson Radio Co. 107-AW Schematic

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Product Information:
Model:107-AW
Manufacturer:Patterson Radio Co.

Schematic Pages

Schematics Content:

Please note: this content is a computer-generated interpretation of the above schematic and is provided only to help assist you in locating this schematic. For the actual text, please consult the schematic above. Thank you.

Page 1:

PATTERSON RADIO CO.

I" DEV IN] FRED IN 7 F/IEQ DUO 'DIODE CATNODE SPEAKER

:so so :coco spao 3 coo

ON CONSOLE o &

B? REC

IF PEAK 262 KC

The values ofA all the parts are given in the diagram and a close study will
show that the normal voltages on the elements of the tubes,eto., areulso
given. Thus, the voltage at the plate of the type 55 tube is 65 volts, and lo

The set covers the wavebands from 15 to 575 meters. The intermediate
frequency unployed is 262 kc.

All models have automatic volume control of the diode type, controlling the
first detector as well as the i-f. amplifier tubes. This AVC makes it
impossible to service and robalanoe without the use of a vacuum tube voltmetero

A defective 82 tube will cause a sharp 60 cycle r-f'. pickup. This is most
prominent on low frequency. Replace with a. good tube._

Overloading or poor quality st lov volume is more often due to an serial of
too greet a length. A powerful local station will cause the i-f. tubes to
block. Check this by disconnecting the antenm on the station causing _the
trouble. If too close to a powerful station, installing a switch in thev aerial
circuit helps this. In rare cases the set seems to overload andthe AVC'wox-ks
too quickly on all stations. In such cases, check the following:

Disconnect the 5-megohm resistor from the AVC buss at _the tie point. Have

all tubes cold. Use s high-voltage, high-resistance ohmmeter capable of read- '

ing 25 megohxas and test from ground to AVC buss for leakage. After the con-
densere have charged, no leakage should be shown. This must read around 100

PATTERSON PAGE 3-1

MODEL 'IO-Aw,1o'I-Aw,` l

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