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McMILLAN PAGE 1-1

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General Description Not many of these c73assis were put out. Because of the high

"A" battery consumption. certain changes were suggested that could be made to reduce "A" battery consumption.

Diagram No. I gives the original circuit and it will be seen that the tube circuit consists of -

2 -224's. 1-226; 1-201A, and 1-171A. Diagram No. 2 shows the changes to be made so the set will

consume less "A" battery current. The tubes are now: 2-NY 64's, or 236's; 2-20IA; and t -112A

The NY 64 tubes are screen -grid battery seperated tubes which were designed for use in automobile radio sets Their current consumption is small, their amplification factor quite high and they are rugged and very long lived

The "A" and B" batteries are root changed to convert the receiver for lower "A" battery consumption.

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Make the changes shown on the diagram. Connect the storage battery to black (neg.) and red (pos.) leads. Insert two NY 64 tubes in sockets marked 224. Place a 201A in socket marked 226. and one 201A in socket marked 201A. Use a 112A in socket marked 17IA. Turn on filament switch and see if tubes light-II so connect "B" batteries as tagged, except "B + 18O" lead-connect this to "B + 135" terminal

Connect two 4/ Volt "C' batteries in series. The "C - 4.A" Volt lead goes to the connection between the 45's Volt "C" batteries The 'C - 45" goes to the 4% Volt part of the second battery

It is recommended that these changes not be made on sets where the customer is entirely satisfied with the operation and the life of the "A" battery. The operation with the 224 tubes is very highly satisfactory. The sensitivity is extremely high, and the tone quality very good.

NOTE- Small dotted Imes show erg,nat plueinq sea Omit., of ports

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NAT. CARBON PAGE 1-1

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MODEL 90 Sohematio, Chassis Voltage

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j i-,3'-`, .s2- · national page 1-1 the national company model s -g 6 model s -g short wave...

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