The meter, a high torque Alnico movement, is protected
against burn-out by a meter fuse. The fuse will not blow on
overloads which are not sufficient to damage the meter. If
the meter does not operate on any range, the fuse should be
replaced with a-1/16 ampere little fuse, Cat. #361.062.
IT IS MANDATORY THAT THIS FUSE NOT BE REPLACED WITH ANY
OTHER VALUE THAN l/l6 AMPERE. If this precaution is not
taken,an error may be introduced or worse,the meter may
Provisions are made for testing all types of receiving tubes
including octal, non-octal, local, cold cathode, miniature,
sub-miniature, and ballast tubes. The circuit is so arranged
that all tests are made under voltages and loads specified
by the Radio Manufacturers Association.
The special "Dynoptimum” tube checking circuit is comparable
to those found in far more expensive tube testers. All
multi-purpose tubes have individual listings for each of the
various sections which are tested separately. Hot and cold
shorts between all elements are rapidly checked.
Microphonics or noise in a tube due to loose elements can be
detected by using the accessible phone jack provided on the
front panel, labeled NOISE.