TS940.4

TS940 ALC MODIFICATIONS
This mod to your TS-940 will change the ALC delay time from
approximately 1 sec to 0.022 second.  This means that the ALC
will no longer impose its own time characteristics on your
audio response; the ALC will now follow your own sylabbic
rate amd emphasis.  Usually the average power output will
increase which will drive a linear amp harder.......(at least
those meters will swing higher!).
The TS-940 has a 10uF cap (C31) and 100k resistor (R104)
which make up the time constant for the ALC.  This tends to
reduce the output power for the duration of the ALC time
constant (or till the circuit charges up again).  Then it
starts all over again on the next word.
This procedure allows modification to the Control PCB (X53-
1420- 11) in the TS-940 WITHOUT having to remove the PCB.
Remove the bottom cover and locate the Control PCB.  Locate
R137 and R104.  These are located in the upper right hand
corner as the rig faces you upside-down (near VR3).  A
Service Manual would be very helpful for locating parts!!!
using a knife edge or similar, carefully scrape off the
insulation from the top of the two resistors.  Tack solder an
1/8 watt 2.2k ohm resistor from the top of one to the top of
the other.  Put the cover on and it's finished.
               RELAYED   BY...N0KGX...GENE