Texas Star CW Transmitter To RF Amplifier Conversion
Model 667V

  1. Unsolder the wire from the key jack on the rear panel near the fuse holders. 
  2. Locate the two standing capacitors (15pf and 33pf) near the relay and RF choke. Unsolder and remove the wire from the tops of the capacitors. Separate and remove the 33pf capacitor leaving the 15pf in place. Re-solder the standing end of the 15pf capacitor to the adjacent pad on the-board, This pad also connects to a wire from the rear panel S0239 connector (Radio). 
  3. Remove the 33 ohm resistor (orange – orange – black) (and wire if present) located directly behind the relay. This resistor connects a RF choke to the oscillator board.
  4. Unsolder and remove the large yellow capacitor (marked 2200K) connecting the center of the blue pot to the oscillator board, Do not remove the resistor connected to the pot.
  5. Locate the white block resistor and RF choke behind the meter. Unsolder and remove the 10 ohm resistor (brown – black - black) from the top of the 30K resistor (orange – black - orange) beside. the RF choke. 
  6. Locate the wire soldered to Pin 1 of the power switch (red lens). Unsolder the grounded end of this wire, and solder it to the 10 ohm 2 watt resistor (brown –black – black) located directly under Pin I of the power switch (red lens).
  7. Locate the large 75 ohm 3 watt resistor (violet – green - black) soldered to Pin 3 of the AM push switch. (green lens). Unsolder the 75 ohm resistor from, Pin 3 of the AM switch and re-solder it to Pin 1 of the power switch, (red lens). This pin also has a wire soldered to it that was relocated in the step above.
  8. Unsolder and remove the oscillator board if desired.

Texas Star CW Transmitter To RF Amplifier Conversion
Model 667V, readers digest version.

  1. Remove yellow 2200K cap of oscillator board from the 10-ohm resistor
  2. Remove 33-ohm resistor of oscillator board from RF choke
  3. Remove orange or green wire of oscillator board and attached 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 piggy-backed to 30K resistor located to right of blue switch next to the RF choke

Texas Star CW Transmitter To RF Amplifier Conversion
Model DX250V & DX350V

  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 attached 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 10-ohm resistor piggy-backed to 15K resistor located next to the white sand block resistor and RF choke

Texas Star CW Transmitter To RF Amplifier Conversion
Model DX250 & DX350

  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 attached 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 bare lead of 10-ohm resistor behind red switch
  10. Remove 10-ohm resistor piggy-backed to 15K resistor located next to the white sand block resistor and RF choke

Texas Star CW Transmitter To RF Amplifier Conversion
Model DX400 & DX500

  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 attached 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 piggy-backed to 30K resistor located to right of blue switch next to the RF choke

Texas Star CW Transmitter To RF Amplifier Conversion
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 attached 33pf cap
  4. Solder the leg of 15or 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 relay
  9. Solder this end to the open solder trace behind green switch
  10. Remove 10-ohm resistor piggy-backed to 30K resistor located to right of blue switch next to the RF choke

Texas Star CW Transmitter To RF Amplifier Conversion
Model Mod - V

  1. Remove yellow 2200K cap of oscillator board from variable pot
  2. Remove red wire of oscillator board and attached 33ohm resistor
  3. Remove green wire of oscillator board and attached 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.

Texas Star CW Transmitter To RF Amplifier Conversion
Model DX-1600 & DX-1200

  1. Remove solder connecting the two yellow 2200K caps together
  2. Remove red wire of oscillator board and attached 33ohm 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 15pf 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 torrid
  10. Solder the orange wire to the radio antenna connector