The HW7, although no longer made, is sometimes available on the second hand market. It is a direct conversion circuit and benefits from certain modifications to be anything like a serious rig. The description below is taken from the manual supplied with the kit, with thanks to Jerry, W1UI
DC Power Input: 3 watts on 40 meters
2.5 watts on 20 meters
2 watts on 15 meters
Frequency - control crystal or VFO
Output impedance - 50 ohm unbalanced
Sidetone - built-in
Spurious and Harmonic levels - At least 25 db. down
Sensitivity - less than 1 microvolt provides a readable signal
Selectivity - 1 kHz. at 6 db. down
Type of reception - CW
Audio output impedence - 1000 ohms nominal
Frequency Coverage :
40 meters, 7.0 to 7.2 MHz.
20 meters - 14.0 to 14.2 MHz.
15 meters - 21.0 to 21.3 MHz.
Frequency Stability - less than 100 Hz. drift after 10 minutes warmup.
Power Required - 13 volts DC, 35 mA receive and 450 mA transmit.
Dimensions - 9 1/4" wide x 8 1/2" deep x 4 1/4" high inc. knobs and feet
Weight - 4 lbs. 8 oz.
A picture will be included when I get a good colour one - G3YCC.