The Series 910, 912 and 915 Dynamic Electronoraeters are
modem push-button operated radio tube analyzers· They also
provide a system for obtaining qualitative analysis of
ballast units and paper condensers·
The tube analyzer circuit of these instruments makes use of
an exclusive PRECISICR engineered tube test system, which in
one operation, effectively checks the two most important
electrical characteristics of a radio tube, namely, MUTUAL
CONDUCTANCE AND CATHODE STRUCTURE (EMISSION).
The novel automatic interlocking PUSH-BUTTON element
selector, incorporated in the Series 910, 912 and 915,
provides for simplicity in operation, visible filament
continuity tests, speedy short check, cathode leakage,
ballast unit tests, and rapidly locates all tube elements
for application of individual test voltages·
From the features listed, it will be noted how accurate and
reliable testing can be efficiently and easily accomplished
with the Series 910, 912 and 915 laboratory testers·
TUBE ANALYZING FEATURES
1· A DYNAMIC TUBE TESTER employing an exclusive PRECISION
engineered circuit, which in one operation, effectively
tests all radio receiving tubes for both MUTUAL CONDUCTANCE
and CATHODE STRUCTURE (EMISSION).
2· TESTS ALL TYPE TUBES: ACCOMMODATES ALL FILAMENT VOLTAGES
from 1.4 to 110 volts, including the new 35, 45, 50, 70, 85
and 110 volt filaments. TESTS ALL LOKTALS, BANTAM JUNIORS
(Miniature Hearing Aid and Pocket Radio Tubes), BANTAMS,
SINGLE-ENDED (Television Amplifiers), REGULAR OCTALS (MG, G
AND METALS), SPRAY-SHIELD AND GLASS TYPES, AND THE NEW
MINIATURE 7 PIN TYPES*
3· TUBE MERIT indications are read directly on a three
colored ENGLISH READING SCALE.
4. DOUBLE WINDOW ROLLER TUBE CHART provides speedy, easy
reading tube references·
New charts furnished from time to time at no charge.
5. DUAL FREE-POINT FILAMENT TERMINAL SELECTION locates
terminals of ALL filaments (single, double, center-tapped
and tapped) regardless of any rotating pin positions.
6· VISIBLE FILAMENT CONTINUITY TESTS show up open filaments
for ALL types of tubes regardless of filament base
connections· This PRECISION developed feature eliminates
delay by immediately determining whether or not the filament
of a tube under test is intact·
7· AUTOMATIC PUSH-BUTTON SYSTEM: PRECISION designed
interlocking push-button selector system affords the extreme
in flexibility for non-obsolescent FREE POINT TUBE ANALYSIS
and Insures ability to accommodate future tube releases.
8. SPECIFIC INDIVIDUAL LOADS AND VOLTAGES (control grid,
screen, plate, etc.,) applied to respective elements of tube
9· VARYING A.C. SIGNAL applied to control grids.
10· METER'READS IN PLATE CIRCUIT: Indications therefore are
entirely dependent upon control action of ALL intervening
11· OPEN ELEMENTS: Shows up tubes with any open element· The
PRECISION DYNAMIC TEST NECESSITATES ALL ELEMENTS Intact for
12· TESTS diodes, triodes, rectifiers, tetrodes, pentodes,
gaseous types 0Z3-0Z4 and remote control gaseous types 0A4
and 2A4 regardless of varying filaments or other element
13. MULTI-SECTION TUBES: Individual tests for each section
tubes Including visible tests of the fluorescent screen and
on cathode ray Indicator tubes. No shifting of tubes
necessary to obtain all tests·
14· HOT CATHODE LEAKAGE TEST: Sensitive neon method quickly
shows up poor cathode structure in accord with leakage
specifications of leading tube manufacturers#
15· HOT INTER-ELEMENT SHORT TESTS made ingeniously simple
through the use of PRECISION Automatic Interlocking
16· NOISE TEST pin jacks incorporated for earphone or
amplifier connection· Each element can be separately tested
for noise through use of free-point Automatic Interlocking
PUSH-BUTTON ELEMENT SELECTOR SYSTEM.
17· BALLAST TEST: The regular tube test sockets accommodate
all ballast unit tests for open and loose elements and
leakage between sections of multisection ballasts, made
possible through the Precision Push-Button system·
18· PILOT LIGHT TESTS for all miniature screw base and
bayonet type lamps.
19. ACCURACY of the tube test circuit is closely maintained
by the use of irkliv- idual calibrating controls, adjusted
and sealed against laboratory standards.
20· LARGE MODERN PRECISION SQUARE METER.
21· TUBE SELECTION REFERENCES plainly marked on panel·
Nothing to remember·
22· PILOT LIGHT ON-OFF INDICATOR: Fused line plug·
23· MICRO-LINE ADJUSTMENT read directly on meter, provided
by use of variable
heavy duty line voltage control· No arbitrarily tapped
24. TELEPHONE CABLED WIRING EMPLOYED THROUGHOUT.
25. PAPER CONDENSER LEAKAGE TESTS. SENSITIVE NEON METHOD.