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the Hallicrafters Co., Chicago

SX - 130

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überarbeitet am 19.10.2010

In the sixties, Hallicrafters changed the front panel design from the classic (semi-)circular dials to the linera dials, one of the typical radios in the newer design is the SX-130.

S - 129
1965
single conversion, 535 kHz - 31,5 MHz, 110 - 125 V, 48 W;
7 valves (6DC6, 6EA8, 6BA6, 6BA6, 6AL5, 6BE6, 6GW8, solid state rectifier)
band spread dial 80, 40, 20, 15, 10 m band.
SX - 130
1965
single conversion, 535 kHz - 31,5 MHz, 110 - 125 V, 48 W;
7 valves (6DC6, 6EA8, 6EA8, 6BA6, 6AL5, 6BE6, 6GW8, solid state rectifier)
band spread dial 80, 40, 20, 15, 10 m band.
additional S meter, quartz filter.
SX - 133
1968
single conversion, 535 kHz - 31,5 MHz, 110 - 125 V, 48 W;
7 valves (6DC6, 6EA8, 6EA8, 6BA6, 6AL5, 6BE6, 6GW8, solid state rectifier)
band spread dial 80, 40, 20, 15, 10 m ham bands as well as 49, 31, 25, 19 m broadcast bands.
with S meter, quartz filter.

 

Single conversion superhet, I.F. 1650 kHz

Analog dial, band spread dial for amateur radio bands

AM, CW/SSB

Sensitivity 

Selectivity 6 dB
 

RF gain, crystal phasing filter

The SX-130 is a receiver quite representative for the Hallicrafters ham band receivers from the mid sixties. The table top receiver is 48 x 20,3 x 25 cm wide and has a weight of 11,3 kg. The crystal marker HA-7, the station console speaker R-47 or R-50 had to be acquired separately.

A circular and a linear frequency dial are very prominent on the front panel, the smaller circular dial is the main tuning dial and the linear dial ist the band spread dial for the amateur radio bands. The respective tuning knobs are located below the corresponding dials, the window of the signal strength meter at the right of the bandspread dial.

In contrast to the early Hallicrafters receivers, the mains switch is combined with the volume control and is located at the right in the bottom row of controls.
From the left, You find the controls for R.F. gain, the band selector, an antenna trimmer, in the middle the bandwidth control with two narrow crystal filter positions and the phasing control to eliminate an unwanted interfering signal.
At the right, You find the noise limiter and the modes switch, it is remarkable that in the SX-130, a product detector with selectable upper and lower sideband and not only a simple BFO is used for single sideband reception.

R.f. signal coming from the antenna first has to pass an R.F. amplifier stage (V1: 6DC6), in the first mixer (V2: 6EA8), the intermediate frequency of 455 kHz is generated. After the AM L/C filters or the switchable crystal filter (V3B: 1/2 6EA8), the signal has to pass two I.F. amplifier stages (V3A: 1/2 6EA8 / V4 6BA6), then the AM signal is demodulated in one diode system of V5 (6AL5), the second diode is used for the noise limiter. For single sideband reception, a product detector is used (6BE6). The A.F. preamplification and final stage is in the tube 6GW8.

The SX-130 is a straightforward ham band receiver with conventional circuitry, it demonstrates what could be realised with simple technical means in the sixites, it still can be used to monitor amateur radio traffic, without sufficient bandspread and poor dial accuracy, it is not very well suited for serious broadcast DX.

weitere Lektüre:
d / e: Hallicrafters SX-130 at www.radiomuseum.org
e: Shortwave Receivers - Past and Present, F. Osterman
e: Dachis, Chuck: Radios by Hallicrafters, Schiffer Publishing Ltd, Atglen, PA 19310, USA