K3MSB

Heathkit DX-60B

I received the DX-60B around 2021 from Ken N3CU. This transmitter, along with an HR-10B receiver, and HB VFO were Ken's novice radios in 1972. After sitting in his attic unused for decades, he didn't want them to deteriorate and wanted them to go to a good home.

I was more than a little concerned about taking someone's Novice radios for obvious reasons, but after several conversations Ken said he was sure he wanted to give them to me – Thanks Ken!

Ken recalled the DX-60B worked, but initial inspection showed there were issues with the transmitter. Numerous cut wires, unsoldered (or broken) connections, and new wires awaited under the chassis.

The front panel has a few cosmetic issues, the biggest of which was baked on tape residue between the Tune and Load controls. It took a lot of time and patience to get that tape residue off without damaging the front panel, and it turned out nicely!

We suspected some of the modifications where in place to enable the HB VFO, built by one of Ken's friends, to work with the transmitter. However, no schematics were available.

Yeah, the VFO is a true Frankenstein, but remember it was built by two 19 year old hams back in “the day”...... and it worked well for Ken for several years!

Since I have an HG-10B I didn't plan on using the HB VFO and it sits untouched. The tube compliment is an OA2, 6AU6, and 6U8. The 6AU6 is probably the oscillator and the 6U8 a buffer stage. I originally thought this wasn't worth restoring, but I suspect if I search the ARRL handbooks from the early 1970's I may find the schematics! Who knows.....

I decided to return the transmitter to stock configuration so began the process of removing non standard wiring, repairing solder connections and general repair/clean up.

In the above photo, I suspect repeated cycles of heating (expansion) and cooling (contraction) caused this wire to break.

The Hayseed Hamfest multi-section capacitor installed on the chassis.

My IT-28 Capacitor Checker is a tool I use very frequently. All new capacitors are tested before use.

New caps and diodes installed!

The other big issue was to address the power switch. This switch is a known failure point on the DX-60B and replacement switches are getting to be 'unobtainium'. For power ON/OFF, I elected to just leave the switch in STBY and control power via an external power strip. For 260 VAC secondary switching, I added a new 117 VAC relay under the chassis. Now the Function Switch contacts switch 117 VAC and not 260 VAC.

The well known modification is by VE6KQ.