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Resume Of Information For Technical minded Readers
LANSING
Shearer Sound System For Better Theatres
Lansing Power Amplifiers. Type 124
The Power Amplifiers are A.C. operated, negative feedback stabilized type and represent the very latest design. Frequency response is exceptionally fine, 40-16,000 cps. plus or minus ^ db. The system of inverse feedback stabilization keeps distortion to a minimum up to the overload point of over 20 watts. Hum and noise level are approximately 75 db. below maximum output or referred to a 6 mw. zero reference has a noise level of minus 42. Wave form at all frequencies above 40 is constant. Five latest type tubes are used in type 124 power amplifiers and the condition of the power and low level amplifier tubes can be determined by a meter mounted on the amplifier panel.
Because Lansing amplifiers are well engineered and have the highest characteristics possible to build into an amplifier they are strongly recommended for all theatre installations where quality of reproduction must be the best obtainable.
Power Amplifiers. Type 140
The type 140 single stage power amplifier is used where more power is needed to cover large theatres or outdoor audiences.
This amplifier uses 2-866A rectifier tubes and 2-845 amplifier tubes and has an output of 60 watts with less than 2% distortion. Gain is 15 DB and frequency response is linear from 40-10,000 cycles. Filter
(Contd from last issue)
condensers are oil impregnated, 2,000 volts. Both filament and plate transformer are separately fused. A safety switch protects the amplifier and operators. Individual plate currents are read on a meter mounted on the panel. All connections are located on the front panel where they are accessible. Input impedance 24 and 500 OHMS, output impedance 6-12 and 24 OHMS.
Power Amplifiers. Type 252.
The type 252 single stage power amplifier is supplied where extreme power and tremendous coverage is necessary. It has an output of 100 watts with less than 2£°0 distor
tion. 2-866A, 2-845 and 1-83V tubes are used.
The amplifier is similar to the 140 except bias peak with a time delay circuit is used to protect the 845 tubes. Other characteristics are the same as in the type 140.
This amplifier is supplied on special order only and prices will be quoted upon request. Always give full information as to the application of the type 252 amplifier you are ordering. What type of equipment do you intend to use with the 252, etc., to International Talkie Equipment Co., Queens Road, Bombay.
This situation promises to be somewhat interesting in "Punar Milan" a Bombay Talkies' picture.
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