Note
The DX-35 was Heath’s first small AM (or “phone” as i was referred to then) transmitter, designed to appeal to the novice who had just upgraded to general. The unit was in the catalog for just two years. The DX-35 uses the DX-20’s silver-and-gray paint scheme, black meter, and gray knobs.
The 35 is a six-tube design covering 80 through 10 (including 11) meters. It includes an electron-coupled Pierce oscillator, a three-stage RF section, a screen modulator, and a single 6146 as the final amp. No neutralizing is required. The 614 permits the DX-35 to run 65 watts on CW and 50 watts on AM. Maximum modulation is about 60 percent. There are rear panel connectors for a VFO and microphone.
The DX-35 uses a pi network output circuit that will load anything between 50 and 1000Ω, and features single-knob band switching and switch selection (on the back panel) of three crystal frequencies or a VFO. Crystals are accessible via a door on the back panel of the transmitter. Note: The crystal access door is the same one used for several Heath oscilloscopes including the O-10, 11 and 12, and the IO-12, 18 and 30.
Particular attention should be paid to the knobs and the panel meter as these are often found to have been replaced with non-original parts. Note that the DX-35 uses a black iron vane meter with a zero adjust, and has the Heathkit logo printed on the meter face. This is the same meter used in the DX-20, but is not the same one used on the AT-1 or DX-40. Also take care to note the presence and condition of the black plastic Heath insignia under the meter. In 1957 the DX-35 was replaced with the DX-40.
Caution: Not fuse protected.
References:
Review. QST. Sep 1956, p. 28.
Brief description. Radio News, Sep 1956, p. 169.
Review. Popular Electronics, Oct 1956, p. 85
Use on 6 meters: CQ, Jan 1957, p. 48.
Improvements. QST. Jun 1958, p. 71.
Improvements. CQ. Jan 1959, p. 48.
Improvements. Electric Radio. Apr 2015.
Power input: 65 watts CW, 50 watts peak controlled carrier phone
Output impedance: 50-1000Ω
Operation: crystal or external VFO; CW, phone
Band coverage: 80, 40, 20, 15, 11 and 10 meters
Power requirements: 120 VAC. 60 Hz, 175 watts
Tubes: (1) 5U4, (1) 12AX7, (1) 12AU7, (2) 12BY7, (1) 6146
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.
