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HQ-170A receiver built by Hammarlund in approximately 1960.
The HQ-170A is a 17-tube superheterodyne triple conversion (3035 Kc, 455 Kc, 60 Kc) receiver that covers the 160-6m bands in seven segments. The receiver has an adjustable slot filter that provides up to 40 db attenuation to help eliminate unwanted co-channel interference over a 10 Kc range. In addition, a slot depth control can provide an additional 20 db rejection at any one single frequency. A linear product detector, separate from the AM modulation detector, is used for CW telegraphy and SSB detection.
The 17-tube lineup is as follows:
- 6BZ6 RF Amplifier
- 6BE6 1st Mixer
- 6BE6 Convertor or 455 Kc IF Amplifier
- 6BA6 455 Kc IF Amplifier
- 6BE6 Converter
- 6BA6 60 Kc IF Amplifier
- 6BA6 60 Kc IF Amplifier
- 6BV8 60 Kc IF Amplifier, AVC, AM Detector
- 12AU7 SSB Product Detector
- 6AL5 Noise Limiter
- 6BZ6 Crystal Calibrator Oscillator
- 6C4 HF Oscillator
- 12AU7 60 Kc BFO, S-Meter Amplifier
- 6AV6 First AF Amplifier, Delayed AVC Gate
- 6AQ5 AF Output Amplifier
- OB2 Voltage Regulator. Unfortunately, solid state diodes are used for the Voltage Rectifier rather than a 5U4 (as with the HQ-170).
Power requirement is 120 watts at 105-125 VAC.
The unit measures 10.5" x 19" x 13" and weighs 38 lbs.
See the Scanned Manual.
http://www.frobenius.com/hq170a.htm -- Last Revision: 31 January 1999
Copyright © 1995 - 2009 Jack Harper
