Linear Amplifier Conversions

Texas Star Conversions

Mod V
1) Remove yellow 2200K cap of oscillator board from variable pot.
2) Remove red wire of oscillator board and attach 33ohm resistor.
3) Remove green wire of oscillator and attach 33pf cap.
4) Solder the leg of the 15 or 18pf cap to input trace.
5) Remove black wire of oscillator board from keying jack.
6) Remove oscillator board.
7) Remove 180 or 190pf cap located next to 230pf cap at rear of board.
8) Remove small jumper from variable pot.
9) Solder one end of that jumper to where the cap was on the variable pot.
10) Solder other end of jumper to pair of holes 4th from front, next to REC AMP switch.

DX-250v & DX-350v
1) Remove yellow 2200k cap of the oscillator board from the PCB.
2) Remove red wire of oscillator board from RF choke.
3) Remove green wire of oscillator board and attach 33pf cap.
4) Solder the leg of 15 or 18pf cap to input trace on PCB.
5) Remove black wire of oscillator board from keying jack.
6) Remove oscillator board.
7) Locate jumper wire attached to backside of red switch.
8) Unsolder the ground end of jumper wire closest to the relay.
9) Solder this end to open trace behind green switch.
10) Remove wire from outer lug of blue pot and solder to other outer lug.
11) Remove 10ohm resistor piggybacked to 15k resistor located next to the white sand block resistor and RF choke.

DX-400 & DX-500
1) Remove yellow 2200k cap of oscillator board from back of green switch.
2) Remove red wire of oscillator board from RF choke.
3) Remove orange wire of oscillator board and attach 33pf cap.
4) Solder the leg of 15 or 18pf cap to input trace.
5) Remove black wire from keying jack.
6) Remove oscillator board.
7) Locate jumper wire attached to backside of red switch.
8) Unsolder the ground end of jumper wire closest to the relay.
9) Solder this end to bare lead of 10 ohm resistor behind red switch.
10) Remove 10ohm resistor piggybacked to 30k resistor located to the right of blue switch next to the RF choke.

DX-400v & DX-500v
1) Remove yellow 2200k cap of oscillator board from back of green switch.
2) Remove red wire of oscillator board from the RF choke.
3) Remove orange wire of oscillator board and attach 33pf cap.
4) Solder the leg of 15 or 18pf cap to input trace.
5) Remove black wire from keying jack.
6) Remove oscillator board.
7) Locate jumper wire attached to backside of red switch.
8) Unsolder the ground end of jumper wire closest to the relay.
9) Solder this end to the open solder trace behind green switch.
10) Remove 10 ohm resistor piggybacked to 30k resistor located to the right of blue switch next to the RF choke.

DX-667v
1) Remove yellow 2200k cap of oscillator board from the 10ohm resistor.
2) Remove 33ohm resistor of oscillator board from the RF choke.
3) Remove orange or green wire of oscillator board and attach 33pf cap.
4) Solder the leg of 15 or 18pf cap to input trace.
5) Remove black wire from keying jack.
6) Remove oscillator board.
7) Locate jumper wire attached to backside of red switch.
8) Unsolder the ground end of jumper wire closest to the relay.
9) Solder this end to bare lead of 10 ohm resistor behind red switch.
10) Remove 10 ohm resistor piggybacked to 30k resistor located to the right of blue switch next to the RF choke.

DX-1200 & DX-1600
1) Remove solder connecting the two yellow 2200K caps together.
2) Remove the red wire of the oscillator board and attached 33 ohm resistor.
3) Unsolder the green wire of the oscillator board from the orange wire.
4) Remove black wire from keying jack.
5) Remove oscillator board.
6) Remove the 33pf cap in parallel with 15 pf cap next to the small relay.
7) Remove purple jumper wire attached to large relay.
8) Solder leg of yellow 2200K cap to large relay where purple wire was.
9) Remove the two 330pf caps in series connected to the large toroid.
10) Solder the orange wire to the radio antenna connector.

KLV HF Linear Amplifier Mods:

250, 500, 550, 300P, 351P:
Push short-out plug on pins 1 and 2 of 4 pin connector.

200P, 200V, 350, 400,  1000, 1000P:
REMOVE IC2

203:
Push short-out plug on pins 2 & 3 on the 3 pin connector.

KL-40 and KL-60:
Remove cover.
Locate the SO-239 receptacle that the wire is not soldered to.
Solder the wire to the SO-239 connector.
Replace cover.