the Hallicrafters Co., Chicago
S - 85
überarbeitet am 19.10.2010
The Hallicrafters S-85 is a single conversion superhet shortwave receiver
from the budget price range of Hallicrafters receivers, it came on the market
in 1954. It has two very charakteristic semicircular dials, the main frequency
and the amateur band bandspread dials.
The Hallicrafters S - 85 is a successor of the S-40 with the characteristic
two semicircular dials as found in other Hallicrafters radios from the fifties.
The upper half of the front panel is taken by a dark grey panel with the two
semicircular frequency dials: one is the general coverage dial with it's
quite coarse frequency marks, the other one the amateur band bandspread dial.
The corresponding tuning knobs are located below each dial. The general coverage
band ranges are 538 kHz - 1,6 MHz / 1,55 - 4,6 / 4,6 - 13
and 13 - 34 MHz, so medium- and shortwaves are covered, the receiver has separate
bandspread dials for the 80 - 10 m amateur radio bands.
The R.F. signal coming from the antenna is fed after an R.F. amplifier stage (6SG7) to the first mixer (6SA7), the 455 kHz intermediate frequency is amplified in two i.f. amplifier stages (6SK7, 6SK7) and fed to the detector stage (6H6). After a A.F. preamplifier stage (one system of the 6SC7), it will be amplifed in the A.F. final stage (6K6GT) with a maximum output power of 3,2 W. The second system of the 6SC7 is used for the BFO. A 5Y3GT rectifier tube is used in the power supply section.
The Hallicrafters S-85 is a simple all wave receiver with a standard single conversion superhet design, it performs well enough for satisfactory reception of the shortwave signals of the major international broadcasters, with the BFO, You can even receive CW and single sideband signals in the amateur bands. The S-85 is not "that" DX machine, but it performs quite well specially on the amateur bands with it's bandspread tuning.
© Martin Boesch, translation 6.11.2010