the Hallicrafters Co., Chicago
SX - 130
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.
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.
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.