Texas Star DX 250 - DX 350
Documentation Project


Texas Star DX 250 - DX 350 CW Transmitter To AMP Conversion

1. Unsolder the wire from the small key jack on the rear panel.
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.Resolder 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).

Remove the standing 33 ohm resistor (ora-ora-blk) and wire located directly behind the relay. This resistor connects a RF choke back to the oscillator board.

NOTE: Some units may only have a wire without a 33 ohm resistor soldered to this point. In that case remove the wire.


Unsolder and remove the wire from the oscillator board connected to the ferrite transformar wire. This connection also has a standing capacitor connected to the transformer wire. Remove the capacitor and solder the loose transformer wire to ground.

NOTE: Newer 250/350V models have a large yellow capacitor connected to the oscillator board, and grounding the transformer wire is no longer necessary. In this case simply unsolder and remove the large yellow capacitor (marked 2200K) connected to the oscillator board.

5. Locate the white block resistor and RF choke behind the meter. Unsolder and remove the 10 ohm resistor (brown-blk-blk) from the top of the 30K resistor (ora-blk-ora) beside the RF choke.
6. Unsolder the wire from the outer terminal of the blue pot. Resolder this wire to the opposite and inner terminal on the blue pot. The outer terminal should now be left empty.
7. Locate the wire soldered to Pin 1 of the Power switch (red lens). Unsolder the grounded end of this wire, and resolder it to the short trace hole protruding out from under the AM push switch (green lens). This trace runs along behind the AM switch and connects to pin 2 of the switch .
8. Unsolder and remove the oscillator board if desired.

Please Note the Warnings Below!

WARNING! This is a violation of FCC rules for Class D CB use in the U.S.A. The user is solely responsible for making sure that any modifications made to the unit must meet all Federal and State Regulations for the Country of use! Liability of damages to any equipment is the sole responsibility of the user! This information is not provided by, or affiliated in any way with the manufacturer of the products.


Copyright © 2001, 2002, 2003, 2004, 2005, 2006 CBTricks.com
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, or otherwise, without the prior written permission of the copyright holder (CBTricks.com).
All logos and Brand Names are the property of their respective owners.

Disclaimer: Although the greatest care has been taken while compiling these documents,

we cannot guarantee that the instructions will work on every amp presented.