Amp help

andypug

Standard Member
I am currently using an old NAD 302Oi amp which I bought for my sister years ago to replace my 91 Cyrus one amp which suddenly wouldn't turn on. After ten years of young kids meaning speakers and hifi have been in storage. Now back in the living room and having inherited some Castle Chester speakers from a good friend that has upgraded and purchased a good condition Marantz CD67SE, the system sounds lovely but am wondering whether the Cyrus amp if I got it fixed would work with the speakers as I used to run a pair of Mission 780SE's which I loved. Or do I spend the £200 odd cost of fixing and upgrading the Cyrus or buy the £200 Onkyo A-9010 that everyone raves about.
It would be great to see if anyone has experience of a Cyrus one with Castle Chester speakers?
 

Gray3

Novice Member
About your Cyrus amp:
You said that it wouldn't turn on and mentioned a £200 cost of repair and upgrade.
I presume that is an official quote you've been given. Do you know, or have you been given any idea of the fault? What is the upgrade that is being proposed?
As a Cyrus amp owner (and someone with City & Guilds Electronics Servicing qualifications) I'd like to think your amp could be got working again for a lot less than £200. The 'upgrade' is another matter. I'm not saying that it wouldn't benefit from electrolytic capacitor replacement / switch / contact cleaning but I can tell you that my Cyrus is 17 years old and has never been 'upgraded' in any way.
In other words, your power-up problem may be all that needs sorting out.
Nowhere near South Essex are you? I'd look and advise just for the fun of it - no charge to you.
P.S. I've just seen you're in Alton - which, for some reason, I thought was in Cheshire. Seems it might be Hampshire - so still not too close to me.
 
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andypug

Standard Member
Thanks for the reply and very generous offer, but I am in Hampshire, the repair I was looking at Cyrus Repair I unfortunately am rubbish with a soldering iron and wouldn't want to mess it up, I have opened it up to check fuses and clean out 28 years of dust, I thought it might be nice to get it refreshed as I loved it for many years but not had the money recently for a repair
 

Gray3

Novice Member
You're welcome.
Good to know you checked for any obvious cause of problem.
Many years ago, I had a Cyrus factory tour and was suitably impressed. I've since read the odd negative comments from customers but, reading that link, looks like their servicing would be as comprehensive as you'd expect.
Haven't heard that best-buy Onkyo, have to wonder whether it would beat a returned-to-spec. old Cyrus.
Good luck with doing the right thing!
 

andypug

Standard Member
Embarrassingly I have spoken to the company that will refurb and fix my amp and they said have you checked the fuses and I said yes the two inside and they said what about the the one in the pull out try by the power socket, ahh I didnt know there was one there? Low a behold it is blown. Quick order to RS will see if it works tomorrow, hopefully it is just age that has made it blow not something else fingers crossed.
 

Gray3

Novice Member
Don't be embarrassed, just be glad that, with luck, you'll be up and running for the price of a fuse!
A bit of switch cleaner in the selector and volume pot....and you may decide that's all the upgrade you need. Let's hope so.
 

MIKEVO

Well-known Member
Embarrassingly I have spoken to the company that will refurb and fix my amp and they said have you checked the fuses and I said yes the two inside and they said what about the the one in the pull out try by the power socket, ahh I didnt know there was one there? Low a behold it is blown. Quick order to RS will see if it works tomorrow, hopefully it is just age that has made it blow not something else fingers crossed.
It's possibly, due to lack of use, the Power Supply Caps need reforming, which is normally achieved by turning up the Mains Voltage gently with a Variac (Which I doubt you have).

Order more than one fuse and keep persevering. If the amp does power up, leave it on for a few days to get the components back to normal operation. :smashin:
 

dannnielll

Well-known Member
Further to Mikes posting. A plausible alternative to Variac.. which is a specialised item used only in workshops or labs is to use a socket wired in series... And then put different domestic appliance into the socket in turn. ..starting with a small lamp and going progressively to an electric heater . Leaving say 30 minutes to an hour at each appliance.
What I mean is sacrificing two low cost extension leads The type from the local pound shop .. usually 2 pounds each. . With the first one DISCONNECTED from the mains strip away carefully the outside insulation and expose the Brown wire . Snip it in two and bare a small section. Both the plug top and socket end are left intact. This is Connector A.
On the other extension cable ,which we will call Connector B ,remove the plug end and connect the Brown and the Blue leads to the two exposed BROWN ends of A.. the standard block connector and insulation tape will make a safe connection.
Now plug the amplifier into socket B..
Now plug the connector A into the mains.. The amplifier will not switch on.
Now plug the lamp into socket A..there may be a faint light in the amplifier,as much of the voltage is now being dropped in the lamp..the lamp will also be dull. You can replace the bulb with higher wattage if you like from Fluorescent 10 W to incandescent 60 to incandescent 100 w. . And progress up to a very low resistance load of a toaster or kettle
What is intended is to ensure that a very low voltage of the correct polarity is applied to the power supply of the amplifier, so that the electrolytic capacitors in the Power Supply can rebuild themselves.
The standard electrolytic is an unstable chemical arrangement where if left unpowered, an aluminium oxide layer can dissolve and allow excessive current to flow. Using a very low voltage the layer can often be rebuilt
 

andypug

Standard Member
Hi all, popped a new fuse in this morning when my RS order turned up, all good amp powers up. I will leave it plugged in over night before I hook it up to the system, thanks for all your help and advice.
 

dogfonos

Well-known Member
Further to Mikes posting. A plausible alternative to Variac.. which is a specialised item used only in workshops or labs is to use a socket wired in series... And then put different domestic appliance into the socket in turn. ..starting with a small lamp and going progressively to an electric heater . Leaving say 30 minutes to an hour at each appliance.
What I mean is sacrificing two low cost extension leads The type from the local pound shop .. usually 2 pounds each. . With the first one DISCONNECTED from the mains strip away carefully the outside insulation and expose the Brown wire . Snip it in two and bare a small section. Both the plug top and socket end are left intact. This is Connector A.
On the other extension cable ,which we will call Connector B ,remove the plug end and connect the Brown and the Blue leads to the two exposed BROWN ends of A.. the standard block connector and insulation tape will make a safe connection.
Now plug the amplifier into socket B..
Now plug the connector A into the mains.. The amplifier will not switch on.
Now plug the lamp into socket A..there may be a faint light in the amplifier,as much of the voltage is now being dropped in the lamp..the lamp will also be dull. You can replace the bulb with higher wattage if you like from Fluorescent 10 W to incandescent 60 to incandescent 100 w. . And progress up to a very low resistance load of a toaster or kettle
What is intended is to ensure that a very low voltage of the correct polarity is applied to the power supply of the amplifier, so that the electrolytic capacitors in the Power Supply can rebuild themselves.
The standard electrolytic is an unstable chemical arrangement where if left unpowered, an aluminium oxide layer can dissolve and allow excessive current to flow. Using a very low voltage the layer can often be rebuilt
I didn't know that - most interesting.

Mind you, I'm relieved andypug is still with us. I was half expecting an obituary!
 

andypug

Standard Member
Not hooked it up yet, I realised when I set up the system with the Nad I didnt use banana plugs just screwed the cable in and the Cyrus needs plugs doh..Now I cannot locate them but I have seem them somewhere Lol. Looked on Amazon but their Prime delivery has taken a massive knock with black Friday as delivery no till Friday. Getting slowly closer to using it again :clap:
 

Gray3

Novice Member
Hi all, popped a new fuse in this morning when my RS order turned up, all good amp powers up. I will leave it plugged in over night before I hook it up to the system, thanks for all your help and advice.
Good news andypug - a happy Christmas in Alton (with its special Christmas 'tree' as featured on Have I Got News For You)
 
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