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Realistic 31-2020

Stereo Frequency Equalizer (1986-91)

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Realistic 31-2020

Specifications

Input Sensitivity: 775mV

Output Level: 775mV

Gain: ± 0dB

Frequency response: 5Hz to 50kHz

Signal to Noise Ratio: 95dB

Total harmonic distortion: 0.015%

Channel separation: 62dB

Control Range: ± 12dB

Frequency Bands: 31, 62, 125, 250, 500, 1K, 2K, 4K, 8K, 16KHz

Dimensions: 420 x 215 x 67mm

Weight: 2.76kg

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Comments

re: 31-2020

Mine developed a 120 hz hum. Investigation led to discovery of a shorted PNP transistor which drives the negative rail of the primary power supply. Those seem to run a little hot gauging by the other two similar power transistor that were still functional. Replaced with a similar gen purpose TO220 case power transistor I had around in a parts bin, to which I also added a small heat sink. Not an exact match but seems back to normal quiet operation again.

Made a point to set all the sliders to their lowest position and gave each a puff of compressed air thru the slot, then worked them all up and down a few dozen times. Did wonders to reduce the scratchy noise significantly.

Might get another 30 years out of it! Nice little unit.

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