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INSTRUCTION BOOK FOR
The National
AM-FM TIMER
The National Criterion is a superb, 14-tube super-
heterodyne tuner offering the utmost in versatility
and performance.
Designed for use either with or
without the National Horizon 5 preamplifier, the
Criterion is completely compatible with all standard
high fidelity music systems as well as the National
Horizon series of amplifiers. In addition to the usual
features found in high quality tuners, the Criterion
offers binaural reception, freedom from adjacent chan-
nel and co-channel interference (accomplished ,by its
unique design, and high capture ratio), provision for
multiplex operation, plus a panel-selected FM Mu-
tamatic circuit. It may be used as a self-contained
unit housed in its colorful protective dust cover or
mounted, with extreme simplicity, into any cabinet
or panel of the user's choice.
CASCODE FRONT END: Provides the maximum
possible sensitivity in the FM frequency range.
FM IF CHANNEL: 8 tuned circuits are used to pro-
vide a highly selective intermediate frequency pass
band.
This enables the selection of adjacent-chan-
nel stations without introducing inter-channel inter-
ference.
CAPTURE EFFECT: The extremely high capture
ratio of 0.8 eliminates annoying interference from
weaker signals in the same channel as the desired
signal.
INSTANTANEOUS LIMITER:
2 cascaded 6BN6's
with instantaneous limiting action are used to elim-
inate the short impulse interference so characteristic
at FM frequencies.
This type of limiting also con-
tributes to the tuner's high capture ratio.
WIDE BAND DISCRIMINATOR: The wide frequency
response and freedom from critical tuning of the FM
channel is made possible by the use of an exception-
ally wide band discriminator circuit.
Please use this manual. It has been prepared with the prime purpose of enabling the user to obtain
full satisfaction from this product.
NATIONAL COMPANY, INC.,
MAIDEN & MELROSE, MASS.
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