Cholly, W3OHV, built a "DX-100 clone" back in about 1956, the year I became a ham. He gave me the rig on Dec. 17, 2005.
At that time he was working for Sylvania, in their tube design and manufacturing departments. He was instrumental in the design of their 6146 transmitting tube, and was responsible for the 6146 production line. When he used this transmitter on the air he was correct in saying he built both the transmitter and the tubes, as it has a pair of 6146's as finals.
Here are some pix I took before I took it out of my van. There had been an internal VFO but it has been removed leaving the space in the front panel. A few other parts have been "borrowed" over the years, and I'm looking forward to checking it out and returning it to operating status.
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And remember: "They don't make tubes nowadays like they used to..."