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Amber Series 70

Stereo Power Amplifier (1978-85)

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Amber Series 70


Power output: 70 watts per channel into 8Ω (stereo), 200W into 8Ω (mono)

Frequency response: 20Hz to 20kHz

Speaker load impedance: 4Ω (minimum)

Year: 1978


schematics   English - rbakley

service bulletins   English - rbakley

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Reviewed Feb 16th, 2016 by ecb015

I worked at Amber in 1980 in exchange for parts to build my own amp. The LM391 were hand selected to not need offset adjustments. All amps were burnt in at half power both channels better than FTC specifications. Output transistors were still being matched in those days. The owners were UVa students, one EE and the other a business major. The name Amber is based on the color of the LED, which was new then.

Reviewed Jan 21st, 2015 by TBroosteRR

I've been messing around with Amber amplifiers since 1983. I have 3 series 70 amps that I have hooked up as monoblocks. I had them upgraded by a guy in town and they are just great. Good separation, base response, power output and highs are clear and beat seems to be right on with no delays. The distortion is very small and they are very quiet solid state amps. They have been reliable. Only regret is, that I bought these from people used and not new. Each amp has a switch that will make them monoblock or stereo. So, you actually only need one for your stereo. I've never used them on anything but audiophile speakers and pre-amps. They should be able to preform in any situation. They don't smell when heated up. They don't get to hot, because of the cooling fins on each side. They are heavy and I guess weigh about +/- 27 pounds each.



re: Series 70

Thanks for thew great info on the s-70. Could you possibly tell us what upgrades you had made to the amp?


Bob Cham

This website is not affiliated with or sponsored by Amber. To purchase Series 70 spares or accessories, please contact the company via their website or visit an authorised retailer.