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RADIO BROADCAST ADVERTISER
129
I^apBtyDhidends from tlu* Investment mToneQuaKfy
A Thordarson Power Amplifier (Home Constructed) Will Transform Your Radio Into a Real M.usical Instrument
CT ^lITH the insistent demand for yy quality reproduction, power am' plmcation has become a vital radio ne* cessity. Today, it is hard to find a radio set manufacturer who does not employ one or more power tubes in the output stage of his receiver.
There is no need, however, for you to discard your present radio instru' ment in spite of the fact that it is out' classed by newer models with power amplification. You can build aThordar' son Power Amplifier which, attached to your receiver, will provide a fullness and richness of reproduction that will equal or surpass the finest offerings of the present season.
Thordarson Power Amplifiers are ex' ceedingly easy to assemble, even for the man with no previous radio experience. Only the simplest tools are used. Spe' cific instructions with clear-cut photc graphs, layouts and diagrams insure success in home construction.
Whether your present receiver is factory made or custom built one of these amplifiers may be attached with equal ease. In fact, most Thordarson Amplifiers require absolutely no changes in
the wiring of the receiver itself, attach' ment being made by means of a special plug which fits the last audio socket of the receiver.
Thordarson Power Amplifiers for the home constructor and professional set builder range from the simple plate supply unit up to the heavy-duty three stage units employing the 250 type power tube in push-pull arrangement. These power amplifiers cover the requirements for every purpose and every pocket-book. They may be used with any type of horn, cone or dynamic speaker.
With a background of over thirtythree years manufacturing quality transformers, it is only natural that so many manufacturers of receiving sets of undisputed superiority have turned to Thordarson as the logical source of their audio and power supply transformers. The discriminating home constructor will do well to follow the lead of these manufacturers when buying his power amplifier.
Write to the factory today, enclosing 2?c for the new "Power Amplifier Manual" — just off the press.
No Amateur or Professional Set Builder Should Be Without This Book —
"POWER AMPLIFIER MANUAL"
A simple, yet complete, treatise on the subject of audio and power amplification, including full information on building, servicing, and testing power amplifiers in general. Also contains detailed specific construction data on twelve individual power units, with clear-cut layouts and diagrams of each.
25c
Send 25c in Cash or Stamps for This New Book — Just Off the Press!
1H0RDARS0N
TRANSFOR-MERS
SUPREME IN MUSICAL PERFORMANCE
MAIL THIS COUPON TO;
THORDARSON ELECTRIC MANUFACTURING CO. 500 West Huron Street, Chicago, Illinois
Gentlemen : Please send me your new "Power Amplifier Manual" for which I am enclosing 25c. □
Please send me free of charge your instruction sheet on the amplifier I have checked below:
171 Single □. 171 Push-Pull □. 210 Single 210 PushPull (1 Stage) □. 210 Push-Pull (2 Stage) □. 250 Single (1 Stage) □. 250 Single (2 Stage) □. 250 Push-Pull (3 Stage) □. 210 Phonograph Amplifier □.
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