[Boatanchors] FW: Heath DX-100--What is one worth??

[Glen Zook]

By the way, there are 2 basic versions of the "plain" DX-100 as well as the DX-100B.  Heath had a modification kit to change the antenna loading from a small variable capacitor and several switched fixed capacitors to a continuously variable antenna loading.  Those DX-100 transmitters that had the loading modification kit installed were known "unofficially" as DX-100A transmitters.  That is the primary reason that the next version was called the DX-100B and not the DX-100A.  There were quite a few of the original DX-100 transmitters that had this modification kit added.  The variable loading capacitor was standard in the DX-100B.

Also, there was another factory modification kit to add a spotting switch for turning on the VFO without having to put the transmitter "on the air".  This kit also modified the keying including running the VFO constantly when in transmit position in the CW position.  This kit was for both the DX-100 and the DX-100B.

A third modification kit for both the DX-100 and DX-100B was to add the necessary circuitry to use the SB-10 SSB adapter with those units.  That consisted of a switch which went on the front panel, 2 SO-239 jacks, and the parts necessary to add 2 each 0A2 voltage regulator tubes to regulate the screen voltage of the 6146 final amplifier tubes.

Glen, K9STH

Website:  http://k9sth.com