olson ra-581

    The Olson RA 581 was one of the most affordable tube receivers available in the 1960s. It had only 11 electron tubes, no RIAA preamplifier, no AM - only FM range. It did have a headphone output with a loudspeaker switch and the option to choose the column resistance of 4/8/16 ohms. The power amplifier could not provide a lot of power because it was built on 6BM8 / ECL82 tubes operating in the SE system. Power supply on a diode voltage doubler. The tuning indicator is a magic eye. and there was no stereo indicator. Interestingly, the MPX decoder was constructed on a PCB. Apart from the tubes, there are also small, miniature filters, evidently from transistor designs.

 

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