Heathkit HA-14 - Page 39

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HRATHEKIT
CW OPERATION
This Linear Amplifier, while designed for SSB
use, can be used for CW operation with the
Heathkit Model HP-24 AC Power Supply. The
duty cycle must not exceed the normal telegraphy
duty cycle of 33% maximum,
For CW operation, the Linear is tuned the same
as for SSB operation, except that the exciter is
set for CW operation, The exciter output should
be increased to maximum output (approximately
100 watts) and keyed,
IN CASE OF DIFFICULTY
Recheck the wiring, Trace each lead in
colored pencil on the Pictorial as it is
checked, It is frequently helpful to have a
friend check your work, Someone who is not
familiar with the unit may notice something
consistently overlooked by the constructor,
It is interesting to note that about 90% of the
kits that are returned for repair, do not
function properly due to poor connections
and soldering, Therefore, many troubles
ean be eliminated by reheating all connec-
tions to make sure that they are soldered
as described in the Proper Soldering Tech-
niques section of this manual,
Check to be sure that all tubes are in their
proper locations, Make sure that all tubes
light up properly,
4,
Check the values of the parts, Be sure
that the proper part has been wired into
the circuit, as shown in the pictorial
diagrams and as called out in the wiring
instructions,
Check for bits of solder, wire ends or other
foreign matter which may be lodged in the
wiring,
If, after careful checks, the trouble is still
not located and a voltmeter is available,
check voltage readings against those shown
on the Schematic Diagram, NOTE: All
voltage readings were taken with an i1
megohm input vacuum tube voltmeter, Volt.
ages may vary as much as 10%,
A review of the Circuit Description will
prove helpful in indicating where to look
for trouble,