Mitchell Mfg. Co. 1258 Schematic

Mitchell Mfg. Co. 1258

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Product Information:
Manufacturer:Mitchell Mfg. Co.
Description:the rondeau

Schematic Pages

PNG: Page 1 Rider Manual Volume 23
PNG: Page 2 Rider Manual Volume 23

Schematics Content

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Before connecting the set, be sure that your home is wired for the voltage and current for which the set is designed, If in doubt, call your local power company for the necessary information, Connecting the set to a supply outlet furnishing the wrong type of current will result in improper operation or damage.

POWER SUPPLY. This receiver is designed to operate on any alternating cur rent supply (AC) ranging from 110 to 120 volts, 50 to 60 cycles; or on any direct current supply (DC) ranging from 110 to 120 volts,

SPECIAL INSTRUCTIONS FOR DG OPERATION. When operating from a DC (direct current) power supply, it may be necessary to reverse the power cord plug in the wall socket before the receiver will function, due to the polarity condition of a direct current supply. If the receiver fails to perform after being turned on one minute, simply reverse the power plug.

TUBES. Four tubes (including rectifier) are used. Type numbers and locations are shown in the tube location diagram on the cabinet back.

ANTENNA, This receiver has a built-in "loop" aerial, Its excellent design is such as to increase pick-up from stations having wide variations in signal strength. The efficiency and selectivity of the loop provide outstanding reception without the use of an external aerial. The "loop" aerial used on this receiver is somewhat directional so reception from weak stations can be improved by turning the set in the proper direction.

GROUND. No ground connection should be used when operating this receiver. The receiver gets its ground connection through the power line and any external connection to the chassis may cause a short circuit and consequent damage.

CAUTION: Do not place receiver on hot objects such as stoves, radiators, etc. Heat will damage the internal components of the receiver.


BOTTOM KNOB. (Manual Volume Control and " On - Off " Switch). Turn this knob to the extreme right. Wait about a minute for the tubes to become heated. When signal comes in adjust volume as desired.

TOP KNOB. (Station Selector) Move the knob over a narrow range of the dial at a point where the desired station is located, until the station is received with maximum volume; then readjust the volume control to the proper level. Never use the station selector to adjust volume as this practice results in distorted tone quality and deficient bass response. The Volume Control only is to be used for this purpose. For maximum clarity the indicator should be adjusted to the center of the area covered by the station being tuned.


This receiver is designed to operate over the standard broadcast band which extends from 540 to 1600 Kilocycles (KC).

DIAL CALIBRATION. The scale is calibrated from 55 to 160 (Standard Broad cast). This band covers all Standard Broadcast frequencies of the United States, Canada, Mexico, Cuba and many Central and South American Countries. Add a zero to figures on the scale to obtain kilocycles.


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