Manufactured by Sony Corp., Tokyo.
As a smaller brother of the CRF-230, Sony launched two somewhat smaller portable radios in the late 1960s, covering long and mediumwaves, a combined tropical band range and nine shortwave broadcast bands, in these 600 kHz wide ranges, the receiver acts as double conversion superhet.
The Sony CRF-150 was the basic version without single sideband reception, its twin, the CRF-160 was equipped with a BFO and thus capable to demodulate CW and SSB signals, for example from radio amateurs.
The Sony CRF-150 is a double conversion set with a considerable size. The 34 x 27.5 x 14.4 cm wide set has a weight of 7 kg. It can be operated from 110 or 220 V mains power or with 6 large UM-1 mono cells.
The front panel of the Sony CRF-150 consists of three parts: the speaker grille at the top, the dials and tuning knobs in the middle and the receiver controls at the bottom.
At the bottom left, next to the headphone jack, is the main switch. Next to it, you find the volume control, the separate controls for treble and bass and the switch for the two IF bandwidths. The keys for the band ranges are reminiscent of the push-buttons on radios from the 1950s; the key SW2-SW10 activates the turret tuner with the spread shortwave ranges.
The wavebands are FM broadcast band 87.5-108 MHz; MW 530-1605 kHz; LW 150-400 kHz; SW1 1.6-4.5 MHz and the double conversion ranges SW2 4.7-5.3 MHz; SW3 5.8-6.4 MHz; SW4 7.0-7.6 MHz; SW5 9.5-10.1 MHz; SW6 11.6-12.2 MHz; SW7 15.0-15.6 MHz, SW8 17.5-18.1 MHz; SW9 21.4-22.0 MHz; SW10 25.5-26.1 MHz. Out-of-band frequencies between the shortwave broadcast bands are not covered.
At the left of the dial window, there is a pilot lamp for mains operation and a small rotary knob for moving the calibration mark in the shortwave bands, below the S-meter, there are the switches for dial illumination and the AFC which is effective in the FM broadcast band.
The shortwave band selected with the turret tuner is displayed at the top of the middle dial window; in the 600 kHz segments, the tuning is linear. By means of the calibration marks, - when receiving a station on a known frequency, the calibration marks can be corrected manually - a frequency can be estimated with an accuracy of less than 25 kHz. The accuracy is not sufficient to determine frequencies of stations in the 5 kHz channel grid.
Below the spread shortwave ranges are the dials for the tropical band ranges 120 - 75 m, the medium and longwave, in these ranges, the reading accuracy is poor to sufficient. The upper tuning knob is used for tuning in the AM ranges, the lower tuning knob for the FM broadcast band. The large rotary switch for operating the turret tuner is located on the right face of the set. Similar to the old Grundig satellites, it gives a good „switching feel“, although some effort is required.
The operation is not challenging for anyone: switch on, select the spread shortwave bands with the SW2-SW10 key, select and tune the desired band with the turret tuner, adjust the volume - done. Single-sideband reception of transmissions from radio amateurs can only be done with the older twin CRF-160.
Single conversion on LW to SW1, double conversion on SW2-SW10, analogue display.
The set is equipped with semiconductors.