STABILITY:
The
W-5M
may
be
operated
with no
load without damage to
amplifier, output transformer
or
tubes.
A
built-in
"Tweeter -Saver" prevents high-frequency oscillation under
abnormal condi-
tions,
which
might
destroy
or
overheat
high-frequency drivers in multiple
-speaker
systems.
Shunt
capacities
of
up
to
0.05
pfd across
speaker line
cause no
tendency
toward instability or
oscillation.
Series
inductance
in
speaker line
causes no tendency
toward instability
or oscillation.
MECHANICAL PROTECTION:
Decorative
top
cover
prevents
contact to hot tube
envelopes;
keeps
connecting
cables
from
dam-
age by
heat;
"chi
Id
-proofs”
normally exposed portions of the
equipment.
Cover may
be
readily
removed
without
tools.
Cover may be
reversed,
front
to back, if
desired. All
controls, con-
nectors
and
fuses
on
one apron of the chassis.
FINISH:
Chassis,
satin gold enamel. Cover,
satin-texture
black.
MOUNTING
PROVISIONS:
Must be mounted
with
KT-66
bases
down.
See template for
space requirements.
Heavy
mar-
proof rubber
mounting
feet
to protect
mounting
surface. Mounting
bolts and
T-nuts
furnished;
can
be
mounted
on
any surface
up
to
7/8"
thick.
POWER
REQUIREMENTS:
105-125
volts
50-60
cycles, 140 watts
WEIGHT:
26.5
lbs.
net
TEST
CONDITIONS:
Output
Impedance
Dummy
load,
16.43 ft
(cold)
resistive.
Line Voltage
117 volts,
60
cycles,
regulated.
Accessories
All
measurements
made while the
amplifier
was fur-
nishing
power to
a Heathkit
WA-P2 Preamplifier.
Generators
For harmonic
distortion
measurement,
Krohn-Hite
model
440-A,
inherent
distortion
less
than
0.1%.
For frequency
response
measurements,
Hewlett-Pack-
ard
model
650-A
test oscillator.
For square
wave tests,
Tektronix
type 105
square
wave
generator.
Distortion
Total
harmonic
distortion
measurements,
Hewlett-
Packard model
330-B
distortion
analyzer.
Intermodulation
distortion;
Measurements
Corporation
model
31
intermodulation
meter,
Heathkit
AA-1 audio
analyzer.
Power Output
Voltage measurements
across 16.43
ft
resistive
load,
using
Hewlett-Packard
model
400-D
vacuum
tube volt-
meter.
Oscillograms
Fairchild
camera on
Tektronix
model
531
oscilloscope
with
type
53
-C
dual
channel
preamplifier.
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