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TUNING UNIT TYPE 222
For Experimental Use with
the new Screen-Grid Tube
A NEW NATIONAL Browning-Drake Transformer, together with a new and beautiful Velvet Vernier Drum dial, Type F, brings out the good qualities of this highly efficient tube in a manner that is both pleasing and inspiring to the experimenter.
Perfectly stable operation is obtained without the use of cumbersome shields or other energy-absorbing devices.
Quoting Volney D. Hurd, Radio Editor of the Christian Science Monitor of Boston, in an article published March 7, 1928:
"Then the writer asked for a fivefoot piece of wire and this was connected directly onto the grid of the shield grid tube. To our pleasant surprise stations still continued to come in. Chicago and Atlantic City highpowered stations were played on the loudspeaker with plenty of volume on • this short antenna, and, of course, the selectivity was markedly improved."
The rigid workmanlike construction of this unit makes its installation simple and permanent. No cutting of sub-panel is required. Everything goes into place with a minimum of fitting and wiring.
You will be agreeably surprised at the efficient results derived with this tuning-unit when used with the UX 222 tube.
£ist Trice Type 222 . .
~{ Two other types also available }
!5.00
NATIONAL 7180 B
is ideal for the operation of this unit, because all voltages are adjustable and thus permit accurate setting for maximum results— and because of the generous factors of safety with which all the component parts are built.
Standard JModel . $40.00
Plus $5.00 for U X 280 or C X 380 tube.
NATIONAL CO. INC. . W. A. READY, Pres., . Sherman, Abbot and Jackson Sts., . MALDEN, MASS.
Gentlemen:
Please send me your new bulletin No. 126-RB. Name Address
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THE COUNTRY LIFE PRESS, GARDEN CITY, NEW YORK