Heathkit TT-1 - Page 4

POWER OUTPUT TESTING
This testing system is perhaps the most satis-
fantna vale ta tlanitey between tactra_
Tactor y in r egar as to similar ayy V WUC test av
sults and actual operation in the equipment. Since
both the input and output powers are known,
the other factors can be determined. In the case
LOW LINE TEST
In this testing system the input voltage to the
equipment is lowered to 105 volts. Sufficient time
should be allowed (10 minutes) for the tube
IN iINnwe oN
ST IAAE AIT
wit we bow i
The HEATHKIT Model TT-1 Tube Tester is a
vacuum tube tester of the proportional mutual
conductance type. It will also test voltage regu-
thyuratrone One of the out-
eye tubes and wiyratrons, Une of tne ou
lators, eye tuoes and
standing features of this instrument is the
Switching system utilized in connecting the var-
ious tube elements to their proper potentials.
By using nine singie-circuit 1Z-position rotary
switches, it is possible to connect the tube ele-
ments (through suitable resistance values) to
separate filtered DC voltage supplies regardless
of the pin numbers involved. The number of se-~
lector switches has been held to a minimum by
providing two cap clips, one each for grid and
plate caps, which are soldered directly into the
eircuit and therefore require no switching. The
setup procedure has been further simplified by
the use of the K, P, and G switches. These
switches make it nossible to check both sections
Pv rave
of a tube having two identical sections with only
one group of settings for all other switches and
controls involved.
The roll chart mechanism is a unique design
which to run freely
throughout its entire length without binding.
The chart rollers are spring loaded to keep
the chart taut at all times to present a smooth
viewing surface. No difficulty in operation
nayvmite tha wall ahawt
Perms Wie rou Cnart
Page 4.
of voltage amplifiers the voltage amplification
nao onarinadt Vv malta will ha »vnf
ang VuULpUue yvoutage Will pe UL prime inter est.
The power output test is ideally suited to test-
ing power amplifiers, where the output power is
of major concern.
heaters to stabilize. If the questionable tube
fails to function properly it should be replaced
DESCRIPTION
should be experienced on the part of the left
handed overator since thimh wheels have been
£ACALL AY UA ad deed VASUASELIY VV We wae
provided on both sides of the panel to eliminate
any crossover problems, The arrangement of
the columns on the chart corresponds to the
placement of the knobs on the panei so that the
setup procedure may be accomplished in an
orderly left-to-right, top-to-bottom sequence.
The roll chart and meter have been illuminated
to make the instrument more adaptable to use
in darkened areas (such as the inevitable dark
corner behind the TV receiver).
In addition to the usual selection of filament
voltages, the TT-1 contains a constant cur-
rent supply of either 600, 450 or 300 ma. to be
used in the testing of series string tubes. This
supply
is
connected
through
the
filament
switch
and is used when called for onthe roll chart just
as any other filament switch setting.
the
TT-1
has
been
designed
with
a
removable
line
cord.
A
line
voitage
outiet
is
mounted
on
the
upper
right
corner
of
the
panel
to
provide
power
for
another
instrument,
a
trouble
light
or
simply
to
replace
the
wall
outlet
used
by
plug-
ging in the TT-1.