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DeForest Studio Type Audio Transformers jkre available as follows: Repeat Transformer — 500 to 500 ohms. vine-to-Tube Transformer — 500 to 100,000 /ihms.
nter-Stage Audio Transformer — 3-1 ratio, tor push-pull to push-pull, or from tube lio push-pull.
Output Transformer — tube to 500-ohm line. Push-pull tubes to 500-ohm line Transformer.
Microphone Output Transformer — 25,000
no 500 ohms, step-down.
*i — 45 push-pull to 500-ohm line Transformer.
500-ohm line to tube Transformer, in two nodels: (1)0 level to +27 DB modulator nput; (2) tube to line input from — 60 o 0 DB level.
Vlicrophone Transformer — two-button lynike, 200 ohms per button, l-ine-to-line Repeat Transformer — 200 to Jj>00 ohms.
Speaker Transformer — for — 45 push-pull. ]\ny desired line-to-microphone output jrransformers.
jdigh impedance choke for impedance ";:oupled amplifier, 200 henries at 4 milli;imperes.
Studio Type
AUDIO TRANSFORMERS
SEEKING ultimate quality for its broadcast transmitting equipment, DeForest engineers have devoted meticulous attention even to such special details as audio transformers. To meet DeForest standards an entire line of studio type transformers has been developed. These components, now offered to other builders of quality equipment, feature:
Complete Shielding
Each transformer is protected by cast-iron case ^ inch thick, insuring complete magnetic and electrostatic shielding and eliminating any additional precautions at time of mounting.
Unique Wi ndings
Primary in two sections, secondary in four sections, reducing distributed capacity to minimum and materially improving the coupling. Due to unique form of winding, coils can be impregnated without affecting distributed capacity. Negligible leakage resistance.
Thorough Impregnation
Coils are vacuum impregnated, eliminating all trace of moisture. Because of thorough impregnation and sealing, transformer is unaffected by tropical or damp climatic conditions.
Increased Core Area
Core area is considerably increased over corresponding types, while keeping copper losses and distributed capacity at minimum. Eddy current and hysteresis losses exceptionally low. Highest permeability core material, consistent with detrimental effects of D.C. and mechanical handling, is employed.
Superior Performance
Foregoing refinements result in performance heretofore realized only with finest laboratory equipment. Frequency response curves tell the story. Primaries and secondaries of two or more transformers can be wired in parallel or series for any desired combination.
Write for technical data on DeForest Studio Type Audio Transformers. And remember, DeForest builds complete radio telegraph and telephone transmitters, crystal controls and monitors, rectifier units, audio amplifiers, and other units, as well as tubes of all types for every transmitting, receiving and special purpose.
deforest radio company
PASSAIC
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NEW JERSEY
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( A U DIONS )
RECEIVING AND TRANSMITTING TUBES
time 1, 1932 • BROADCASTING
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