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RADIO BROADCAST ADVERTISER
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The Thordarson Z-Coupler, a special audio impedance coupler for use with screen grid tubes; price each, $12.
Screen grid audio amplification, most revolutionary development in audio systems since the introduction of the power tube, is now an established fact.
The Thordarson Z-Coupler is a special audio coupling device designed for use with the screen grid tube UX-222. With the remarkable amplification thus obtained a mere whisper from the detector is stepped up to a point that gives the power tube all it can handle in the way of signal voltage. In fact, one stage Z Coup led audio has the am-^ plification equivalent of two, or even three, stages of ordinary coupling. Signals barely audible before may now be heard at normal room volume.
In tone quality, too, the Z-Coupler is unexcelled. Despite the high amplification the tonal reproduction is as nearly perfect as any audio amplifier yet developed. Both high and low notes come through with the same vol ume increase. Even at 60 cycles the amplification is over 95% of maximum
Regardless of the type of your receiver you can vastly improve its perform ance by including this new system of amplification. The Z-Coupler replaces the second audio transformer, with very few changes in the wiring. The screen grid tube is used in the first audio stage. No shielding is required.
<3v Complete, information
THORDARSON ELECTRIC MFG. CO. Huron and Kingsbury Sts., Chicago, 111. Gentlemen :
Without obligation on my part, please send me complete information on screen grid audio amplifiers using your new Z-Coupler. (357S-J)