MDX-200
D&A MANUFACTURING (SCOTTSBLUFF NEBRASCA) MDX-200 AMATEUR HAM RADIO 20 METER CW MORSE CODE TRANSMITTER.
Supplementary photos

PDX-400
D&A Co. PDX-400 sweep tube type transmitter-amplifier for 15 meters. Has low and high output with 3 or 6 tubes per choice, with a total of 10 6LQ6 tubes! Has VFO input on the rear apron and with 5 watts from VFO output is 250 watts low and 650 watts high output on 15 meters. On 12 meters, the output is same. At that setting, the tuning capacitors were only about half meshed. Size is 17"X7.5"X11". Wt. is 35#.
Supplementary photos

Raider
D&A Co. Raider sweep tube type power amplifier for 40, 20, 15 and 10 meters. Has 4 6LQ6 tubes. Has VFO input on the rear apron.
Supplementary photos