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1	ongmeers were
# i	consulted on the
ó	problem.
^f • B	SONOTONE
0 • n,	SOLVES IT:
r-t? •4	Sonotone engineers
6^:.	discovered that they
■r • i	could correct all three
	complaints by
fC |^s •	reclesigning just one
	tul>e.
•• • i . •	RESULTS:
V^1*	The heater element
^n i •ł * u	was changed to a coil
.	heater, e iminating
r;	the hum. And rigid
	Controls on the mount
• : •	structure and
9-	Processing reduced
rj* %	microphonics and
•i ’ ■	noise. This resultcd in
a •	the Sonotone reliahle
	tyjK* 7025. It’s now
*	available for initial
V	cquipment and
	replacement purposes.
:«•	I,cl Sonotone help
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% :	problem, too.

straight arm casc which always re-quires an undershoot.

The second thing to notę is that a does not depend upon the offset angle p. This is so bccause each length of offset arm automat ically requires a specific olTset angle which satisfics all conditions for minimum over-all traek-ing error. In other words. once an arm length is chosen by the mamifacturer there is one. and ontjj one. offset angle that will properly set the tracking errors equal at radii of 2.50. 3.78, and 5.75 inches. Any other choiee of olTset angle will set the tracking errors equal at completoly different radii than those chosen in this article.

Unfortunately, there does not exist a generał agreement among arm manii-facturcrs as to what radii should be used in setting the tracking errors cqual. The outer radius generally varies from 5.75 to fi.OO inches and the inner radius anywhere front 1.80 to 3.00 inches. These wide variations make it impossible to specify a simple formula which will allow the user to properly position any manufact urer's arm for minimum over-all tracking error. Therefore. cach arm nnist be oriented so that it satisfics the tangoncy criteria which the manufacturer originally chose in the design of his arm. We can only (juestion whether or not the manu-facturer’s choice is a realistic one.

Luckilv, the olTset arm is so superior

for superb recording and playback!

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•DoPont łCejj. TM

RADIO CORPORATION 0P AMERICA

Hettron Tubę Diuision    Harrison, N. i.

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Hear these authentic recordings of dramatte events from

“The Amazing World of Short Wave Listening”

norroted by Alex Dreiet, Kodio-1 V "Mon on the Co"

•    President's voice from outer spocę!

•    Actuol copture of o desperote criminol!

•    Radio omoteur ot Linie Americo!

•    Ships ot sea . . . aireraft in oction!