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Dynaco SCA-80Q

4-Dimensional Amplifier (1972)

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Dynaco SCA-80Q


The Dynaco SCA-80Q is an all silicon solid state stereo control amplifier of exceptionally high quality.

It functions as the control centre for all mono or stereo signal sources, such as a record player, radio tuner, tape recorder, television sound, etc., and provides output connections from two 30 watt power amplifiers for either two or four loudspeakers, as well as a front panel jack for stereo head phones.

Thoughtful planning has provided exceptional flexibility with remarkable ease of operation.

The SCA-80Q incorporates special circuitry which enables Dynaquad 4-dimensional playback for increased realism from a four speaker system without any additional electronics.

Alternatively it may be used as a conventional two channel stereo amplifier with provision for optional connection of a second pair of speakers in a remote location.


Power output: 30W/ch into 8Ω (stereo), 30W/ch into 8Ω (quadraphonic)

Frequency response: 15Hz to 50kHz

Total harmonic distortion: 0.5%

Damping factor: 40

Input sensitivity: 3mV (MM), 130mV (line)

Signal to noise ratio: 60dB (MM), 80dB (line)

Channel separation: 50dB (line)

Speaker load impedance: 8Ω to 16Ω

Semiconductors: 20 transistors, 10 diodes

Dimensions: 13.5 x 4.25 x 10 inches

Weight: 16lbs


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Reviewed Sep 30th, 2018 by

When this amp is properly restored it sounds fantastic !
Many will step around it to get to amps that do not perform as well , simply due to the 4 speaker / quad / surround thing.
I have mine connected to a pair of AR3a's and a Thorens TD 160 TT . The sound is beautiful !
Classical , rock , jazz.. the sound is mind roastingly good for such an old system.
More modern Klipsch KG4's and Quartets are also sounding so good that I have been listening to this vintage setup exclusively ..i have to laugh.. a 35K system sits and the vintage system that cost me less than a grand ( all fully restored ) just has my undivided attention.This little classic sounds fantastic and it's just a fun amp . It's cheap , simple and has great performance. Yep..some beat it up and say it sounds awful..harsh , cold ..NOPE.. When your vehicle need service and you ignore it because it still starts and drives ..that's not a fault in the vehicle ...thats neglect ..
A serviced (properly)example of this model from Dynaco will be a pleasant surprise to most.
Find one fully serviced or find a clean example and bring to a pro. Very sweet amp ...a real classic and very cool part of a vintage 70s system that will make you feel good all over !
Is it worth spending a pile of hundreds on ? Hardly.
Is it worth 100- $200 +/- in excellent condition ready for action?? YES ! the nostalgic cool factor and it's performance is well worth that .. I mean 2 bags of groceries these days cost ya a hundred beans!

Reviewed Jul 25th, 2018 by

I was so surprised how good sound comes out of an old Dynaco SCA-80Q!
Have few other amplifiers but this one is my daily comfort zone- most pleasant, tube like sound- can listen for hours especially with higher end turntable and vintage Advent speakers. Nice combo!



This website is not affiliated with or sponsored by Dynaco. To purchase SCA-80Q spares or accessories, please contact the company via their website or visit an authorised retailer.