Butler Brothers N5-RD-250 Schematic

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Product Information:
Model:N5-RD-250
Manufacturer:Butler Brothers
Description:9022N

Schematics Content:

Page 1:

BUTLER BROS.

MODELS N5-RD-250, Chas.9022N
N5-RD-251, Chas. 9022H

DIAL AND POINTER
DRIVE CORD ARRANGEMENT

To string dial cord, turn the main drive drum to mal. mum counter-clockwise position and use following parts: 114955 Clip on end of cord 117057 Cord (55 inches) 119087 Ring for dial cord 161384 Tension Spring

SOCKET VOLTAGES Measured with voltmeter having sensitivity of 1000 ohms per volt except where indicated by (*).
VOLUME ON FULL WITH NO SIGNAL
DIAL TUNED TO S40 KC.

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KODELS NS - RD - 250, Chas.9022N;
15.BD - 251, Chas.9022H

BUTLER BROS.

ALIGNMENT PROCEDURE
1. Remove chassis and loop from cabinet. Solder approximately 8" of insulated wire to any B connection (see voltage chart on opposite side for convenient B location). Then reinstall chassis and loop in cabinet. The B lead should extend from under the chassis at the back.
2. Connect ground lead of signal generator to B lead
3. Connect output meter across the speaker voice coil (terminals at back of speaker.)
4. Turn the tuning control knob clockwise as far as it will go (tuner mechanism is now in maximum open position with tuning slugs almost completely withdrawn from coils). Dial pointer should then point to 1600 Kc mark on scale. If it is set incorrectly, release pointer clip on dial cord and reposition pointer.
5. Set volume control at maximum volume position and use a weak signal from the signal generator.

AUDIO OSCILLATION The audio system of this receiver utilizes a two stage type of inverse feed-back arrangement and, should it ever be necessary to replace the speaker or output transformer, it is important to maintain a definite phase relationship in the feed-back circuit. If the connections to the out. put transformer are reversed or it the feed-back connection ie made to the wrong side of the output trans former secondary: the system will become regenerative instead of degenerative. Under those conditions audio oscillation may result. If that occurs, oscillation may be prevented by reversing the connections to the secondary of the output transformer.

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