Dictograph Products Co., Inc. 91175
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|Manufacturer:||Dictograph Products Co., Inc.|
This receiver is equipped with an automatic overload control which necessitate setting the manual volume control of the receiver to its maximum position to insure accuracy in alignment. To control the signal output of the receiver it will be necessary to use the attenuator control of the signal generator. Connect the low potential side of the signal generator to the metal chassis through a .1 mfd. (400 volt) condenser for the following adjustments.
ADJUSTMENT OF I.F. CONDENSERS
(a) Remove the control grid lead of the 6A7 tube and insert a 50,000 ohm (carbon type 1/3 watt) resistor in series with same. Then connect the high potential lead of the signal generator through a.001 nfd. condenser (paper tubular 400 volt type), directly to the control grid of the 6A7 tube.
(0) - Turn the rotor plates of the ganged variable condenser where no broadcast station carrier is heard (approximately 1000 XC). If this is not possible connect a.1 mfa. condenser (paper tubular) from the oscillator gtator section (see sketch) of the ganged variable condenser to chassis.
(C) - Place an output meter (copper oxide type) across the mystic ear terminals with the speaker control switch in & clockwise position so that variations in signal output can be noted.
(d) - Place the signal generator in operation, adjust the carrier frequency to 456 KC and regulate the attenuator control of the signal generator so that the output signal is low enough to insure accuracy in adjusting the I.F. condenser
(e) Adjust trimmers 1-1, T - 2 and T - 3 (see alignment layout) to resonance as indicated by the greatest swing on the output meter.
ADJUSTMENT OF THE GANGED VARIABLE CONDENSERS
(a) Remove the signal generator connection from the control grid of the 6A7 tube and replace the control grid lead. Then connect the antenna wire of the receiver to the high potential lead of the signal generator through 200 mmfd. condenser (mica type).
(b } Set the dial pointer directly at the last long line at the right hand side of the dial with the ganged variable condenser fully meshed. Then rotate the receiver dial to 1,500 KC.
(c) - Adjust the carrier frequency of the signal benerator to 1,500 KC and, starting with trimmer T.4 and then T - 5. adjust each for maximum signal output.