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BGW 500

Stereo Power Amplifier (1974)

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BGW 500


Unique design features incorporated into the Model 500D make it virtually fail-safe and free from accidental damage caused by human error in audio service.

A fast acting SCR (silicon controlled rectifier) crow bar is employed as a safeguard for your speakers.

The sophisticated sensing circuitry for the crow bar constantly samples the individual outputs of each channel.

The outputs of each channel are integrated and passed through an absolute value detector.

The output of the detector is connected to a comparator which is activated by the presence of a large DC component.

If such a value is present, the comparator in turn triggers a fast discharge pulse circuit which gates the SCR crow bar.

The crow bar is essentially a direct short placed across the two power supplies and this activates the circuit breaker.


Power output: 200 watts per channel into 8Ω (stereo), 501W into 8Ω (mono)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.1%

Damping factor: 200

Gain: 26 dB

Input sensitivity: 2V

Signal to noise ratio: 110dB

Speaker load impedance: 2Ω (minimum)

Semiconductors: 2 x IC, 37 x transistors, 1 x unijunction transistor, 1 x thyristor, 5 x zener diodes, 19 x diodes

Dimensions: 7 x 19 x 12 inches

Weight: 52lbs


D owners/service manual   English -

D review (stereo review)  English - MarZutra

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re: 500

Having fits w a BGW 750 that someone has fooled w/the stereo switch wiring. i am getting only very low output from the amp and I am not really wanting to disassemble it. Does anyone have the color code wiring for where these wires actually connect .? i have the two black and whites on each side for the outputs but the switch side , where does the solid white and white w/red go.? Any help would be greatly appreciated. Thanks.

This website is not affiliated with or sponsored by BGW. To purchase 500/500D spares or accessories, please contact the company via their website or visit an authorised retailer.