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HH Scott Alpha 6

Stereo Power Amplifier (1976-77)

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HH Scott Alpha 6

Specifications

Power output: 60 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 50kHz

Total harmonic distortion: 0.1%

Damping factor: 50

Input sensitivity: 1V

Signal to noise ratio: 100dB

Dimensions: 495 x 318 x 130mm

Weight: 15.5kg

Year: 1976

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Reviews

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Reviewed Nov 02nd, 2019 by

Just picked one up at a surplus dealers warehouse. Replaced all the caps. All pots were in good working order. Unit is very nice looking. Sounds good and has an extremely low noise level but I am unable to properly complete the bias adjustments. One side is out of range and the other doesn't adjust.

At 1 Watt, 3db points were 2 Hz to 150Khz. Spec says 20Hz to 50Khz at power. I didn't run it too long due to one of the left channel transistors was clearly working too hard. I won't run it until I can verify correct biasing.

The amp circuit is fairly simple. The amp boards are difficult to access in place. I think removal might be necessary.

The panel lamps for the two meters are leaded bulbs. I have made my own with some careful soldering since one was out and the other 3 were blackened.

I'll continue on as I dig deeper.

 

Comments

re: Alpha 6

I am looking for more info on how to properly bias the amplifier as well. Any update?

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