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Cyrus 1

Stereo Integrated Amplifier (1984-92)

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Cyrus 1


Power output: 25 watts per channel into 8Ω (stereo)

Frequency response: 1Hz to 50kHz

Total harmonic distortion: 0.005%

Damping factor: 100

Input sensitivity: 0.4mV (MC), 4mV (MM), 65mV (line)

Signal to noise ratio: 67dB (MC), 84dB (MM), 86dB (line)

Dimensions: 85 x 215 x 345mm

Weight: 4.5kg

Finish: black / grey

Price: GBP £230 (1991)


service manual   English -

instruction/owners manual   English - Johninoxon

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Reviewed Jan 04th, 2015 by vinyl_solution

As with Cyrus 2, love the Cyrus 1... Fabulous sound which never ceases to amaze but sadly my OAP amps now need phono-stage repair (failed capacitors) any advice, schematic etc would be most welcome please as, Cyrus Electronics (who now own Mission) want 240GBP for each repair! Zoinks!

Reviewed Apr 09th, 2012 by daniele mattei

A little gem!

Reviewed Jan 26th, 2012 by JaS

A bit brighter sounding than the Cyrus 2, but partnered with the right equipment it's a dynamic performer. A good phono stage built in too.



Cyrus One (1990)

Thank you for sharing the manuals.

I've been using this remarkable amplifier since 1990 and have served me without any hiccups except for burnt fuses now and again. I have yet to send the amp for a major service but I think I would do it myself with the help of your shared manuals.

IMO this amp although coming into its 22 years still sounds the same as and when I bought it back in 1990 in Brighton, England. I also bought the Cyrus 780, Marantz CD62 and finally the Linn Basik Akito/K9 t-table. This setup is still with me here in Malaysia. The best combination.

re: Cyrus One (1990)

Hi Jumpstat,

I too have been using my Cyrus 1 since the early 90's and I have just found myself in the situation where I need to use it with headphones. Plugging in my 'phones doesn't cut out the speaker output (apparently by design). Do you happen to know whether it's safe to run the amp without the speakers being plugged in? I know that my guitar amp shouldn't be used without speakers. Is it the same for the Cyrus?

Thanks in advance for any help or advice that you could offer,



muchas gracias por el manual,y el esfuerzo

Cyrus one

thanks a lot for Your help but I am looking for a service manual or circuit diagram for cyrus one TUNER. Can You help me?


Service manual for Cyrus one tuner


Looking for such manual too. Did you finally find it?
Have some burned components to identify (IC9 - erasable EEprom - on main board and T33 on display circuit board).



re: Service manual for Cyrus one tuner

I have the same tuner standing here:
T33 is a PNP transistor BC212L.
IC9 is a 256x8 bit eeprom PCF8582A.

Could you please identify capacitor C19 on the mainboard for me?

Onno Tromop

service manual

Thanks very much for service manual , a really useful site , much appreciated.

Dave Pentin.

Mission Cyrus One

Thanks for the manual - cheers!

service manual cyrus 1 and 2

Hi there,
Thanks a lot for the service manual I was able two download for my cyrus one.
I did alos look for the service manual for the cyrus two but wasn't able to find that one on your side. Do you by any chance have that one as well?

Thanks again!!


Thanks a lots...

Thanks a lots...

Thanks a lot!!!

Thanks a lot!!!

Cyrus One

Ancora grazie

This website is not affiliated with or sponsored by Cyrus. To purchase 1 spares or accessories, please contact the company via their website or visit an authorised retailer.