Radio Broadcast (Nov 1926-Apr 1927)

RADIO BROADCAST ADVERTISER 191 Is actual reproduction possible? ALTHOUGH it is common to hear such claims as "Perfect Reproduction," "Absolute Perfection," "The Living Artist Brought Right into your Home" — in spite of these claims scientists have never boasted absolute perfection in radio reproduction. Let us look at the facts. At the broadcasting station the music of the violin, for instance, is changed into a radio wave, and is broadcast. It is then detected in your radio set and changed once more into an electric wave carrying the impulses of the music. This electric wave emerges from the detector tube not altogether perfect. However, it is so nearly perfect that radio science has turned its attention from the broadcasting and detecting phases of reproduction to the audio amplifying of the detector tube output Reproduction by good amplification has become the most important consideration in the art ot radio. The amplifying transformers that were used in radio sets last year are definitely a thing of the past. Almost every set manufacturer has improved upon them. Some have adapted resistance coupling, others large size transformers, and some electric light socket power amplification. Although these methods of amplification are an improvement, they do not and cannot give perfect reproduction, nor do they come as close to perfection as has now been made possible by the recently announced new principle of audio amplification. The New Amplification An entirely new system of amplification known as Truphonic has been developed. This system more nearly approaches actuality than any other yet devised. Scientific laboratory tests and tests before both the musically trained and the musically untrained ear establish this fact beyond question. Unfortunately the Truphonic system was not developed in time to be generally used in this fall's production of radio sets — with the exception of a number of the makers of the more expensive sets who have a smaller production, and who were able to incorporate Truphonic amplification into their instruments. But for radio listeners and lovers of f.ne music who want this most nearly actual of all reproduction now and immediately, the Truphonic Power Amplif er is provided in the simple, compact form shown below — for instant attachment, without tools, and with no change whatever in your present radio set. Whether you bought or made your set this year, last year or five years ago, the Truphonic will give you finer reproduction than you can get in any otherway— regardless of how much you can afford to spend. The Truphonic Power Amplifier operates directly from the detector output. No transformers now in the set are uti ized. This pure detector music in every note, tone, and shade and in considerably greater volume, is so beautifully and faithfully reproduced that you will find it as difficult to describe as it is for us to attempt to describe it to you. The Truphonic with Power Tubes Besides the fundamentally great improvement in reproduction that the Truphonic brings to radio in such a conveniently applied form, there is the added advantage that for those who want extreme volume without overloading the last stage tube, the necessary extra B and C battery connections for the use of power tubes are provided for in the attachment cord. We have tried in this space to give you some idea of what you may expect from this new principle of audio reproduction that has come to radio. We realize that we have made some strong claims for Truphonic amplification, but we have made no claim that you will not find more than backed up when you have tried the Truphonic yourself. We urge you to get the Truphonic now — so that you may begin immediately to have an altogether different kind of enjoyment of the splendid programmes that are coming to you over the air. Your dealer has the Truphonic, or will get it for you. ALDEN MANUFACTURING CO. Dept. B20 SPRINGFIELD, MASS. I Not i [Resistance Coupled! Power Amplifier $20 ■Jf Examined and approved by Radio Broadcast -jf