1925 Leutz Model L Domestic Broadcast Band Receiver Kit

Top of the Line Receiver

The banner photo shows a 1925 Model L Superheterodyne Receiver, designed by Charles Leutz of the Experimenter's Information Service,New York. This company published hard cover books with complete plans and parts sourcing so the radio enthusiast could build his own radio. The big patent battle concerning the superheterodyne, a much improved type of receiver design, had finally finished and the market was now wide open and no royalties were required. The Model L is from the 1924 edition, the period where radio was coming out of the experimental realm and into the living room. The equipment looked quite imposing, all those knobs, switches and meters. The top section contained the vacuum tubes while the lower section held the tuning inductances and capacitors.
The total of the itemized parts list was $346.95, except the vacuum tubes, out of New York. This would get all the parts to make the ten tube radio exactly as shown, which was "six stages of R.F. amplification and one audio amplifier, two detectors and oscillator". In other words, one mixer (first detector), local oscillator, six intermediate frequency amplifiers, an audio detector (second detector) and a final stage of audio frequency amplification feeding a speaker or ear phones. The cost would be about four months pay!
Of course the speaker on the right, the lead acid batteries, charger, antenna and table are all over and above the price of the radio itself.

These radios were capable of some amazing results--for instance one Horatio P. Belt on the Steam Ship "Western World", using the Model L shown above, wrote to the Experimenter's Information Service the following enthusiastic note:

Feb 20 Chicago, Newark, Louisville, Pittsburgh, New York, Kansas City
Feb 21 1700 miles S.E. New York, WOC Davenport Iowa
Feb 22 2450 miles S. E. New York, WJZ Newark, Waldorf Astoria and McAlpin
Feb 23 2700 miles S. E. New York, WGY General Electric Schenectady, WOR Newark, WDAA Nashville, Tennessee
Feb 23 3000 miles S. E. New York, Greb-Gardner prize fight--plainly heard the blows and the roars of the crowd and referee's statements.
Feb 24 3350 land miles S. E. New York, 11 p.m. ships time, 8 p.m. Eastern time, near equator, bad static WJZ--KDKA--KYW
Feb 25 Sunday night, 3825 miles from N. Y. church service Pittsburgh KDKA
Feb 26 4400 land miles from N. Y. attached receiver to ship's main aerial, this apparently did away with some of the static, man's tenor voice, operatic either Valparaiso, Buenos Aires or Rio, more probably the latter. Static too bad to get anything more en route. I have no doubt but what, used during the dry season, that Rio could get the various cities in the U.S. with but little difficulty using the Model "L".

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