Hammarlund 200 Series Tech Data

All the models are 18-tube (16 in the receiver, 2 in the separate power supply), single conversion superhets with 2 RF stages and 3 IF stages operating at 465 (*not* 455) KHz. In addition to a 5 position single-crystal filter with variable phasing, the IF selectivity is continuously variable between 3 and 16 KHz. The radios are equipped with full bandspread on all except the 0.1 to 0.4 MHz bands, variable BFO, diode noise limiter, and 14 watts of audio output power. Claimed sensitivity is 1.0 to 1.7 microvolts on the LF and HF ranges. The main dial calibration is 1/2 of 1 percent of the highest frequency on each band. (That's 50 KHz at 10 MHz!) Total power consumption is about 180 watts.

The tube/stage lineup is:


NEW! Redrawn BC-779B schematic by Eberhard Hewicker, DK3HE.  Provided in two PDF files, which can be printed and taped together.   Can also be greatly zoomed/magnified for those tired old eyes. Part 1 and Part 2.

The Vintage and Military Amateur Radio Society Super Pro manual scans and photos.

Schematic -- Antenna to 3rd IF Amp       Schematic -- 1st IF Amp to Audio Out

Schematic -- External Power Supply RA-74C       Tube Socket Voltage and Resistance Tables.

RF/OSC alignment diagram       RF Sensitivity and Audio Response graphs       IF Selectivity graph


Power Supply photos       Front Panel (labelled)      

Inside top view (labelled)       Inside bottom view (labelled)

How to run your SuperPro on batteries.     The batteries, however, should be on steroids!   The approximate power requirements (based on the power supply variants) are 380 VDC at 50ma, 250 VDC at 100ma, 100 VDC at 4.5ma, -50 VDC at 11ma, and 6.3 V (AC or DC) at 7 amps.

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