HEATHKIT DX-20 TRANSMITTER RESTORATION
I purchased this Heathkit DX-20 from the Shelby, NC, hamfest for $20.00.
It was a true "barn" radio; the chassis topside was covered
in dust and insect poop.
Heathkit introduced the DX-20 in 1957 as a replacement for the Heathkit AT-1 transmitter. It uses a 6DQ6 output tube with 50 watts input, will put out around 28 watts on 40 meters. Complete details can be found at this Website: http://www.heathkit-museum.com/ham/hvmdx-20.shtmlSince restoring the rig, I have had a number of enjoyable QSO's on 40 meters. Several fellow hams have told me they either built and/or used a DX-20 as one of their first rigs. Most hams had an enjoyable story to tell about their using this rig. If you have a story to tell about your DX-20, drop me an Email (good Email address located on QRZ.com Website). I would like to post personal testimonials to this DX-20 Webpage.
Basically, I disassembled the transmitter, cleaned all the parts, and reassembled it using the construction manual. The transmitter had defective electrolytic capacitors, a bad output and oscillator tube, and a cracked and shorted output loading capacitor. I was able to locate a replacement capacitor from a fellow restorer.
The picture of the left is a front view of the restoration.
Here is the rear of the cabinet. I find replacing all the hardware with new adds much to how a finished restoration looks. I replaced the power cord with a modern 3-prong cord.
|After much cleaning, the rig cleaned up nicely. There are several blemishes that are etched into the aluminum. Fortunately, both the meter and the power transformer still worked.|
|Here is view of the bottom. The new electrolytic capacitors are quite smaller than the originals. Really not much underneath to one of these early CW rigs!!|
Thank you for your interest in my restoration, 73's, Jim, W4BRX