Mission Cyrus 2 - blown output transistors?

[tonky]

I have an elderly Mission Cyrus 2 . The speaker cables have touched - shorted something - now it doesn't work. I understand this amp didn't have protection circuitry built in. What's likely to have blown and what's the likely cost of repair?

Thanks in advance Tonky

 

[eggontoast]

It has probably only blown the O/P transistors and possibly the drivers. If I remember correctly, depending on which version you have it uses BUV28 power transistors, there about £4 each along with a couple of power rail fuses. Total cost of the repair should be in the region of £35 - £50 I would say.

Why don't you give it a go yourself, the cyrus 2 is pretty straight forward to repair and the service manual is readily available.

 

[Rethep]

Did you really short circuit both channels ?

There could be some fuses in there too, which might have blown instead of the transistors ?! I don't know. But in the other case the other "poster" is wright: look at the transistors. The service manual is downloadable from the Cyrus-site.

 

[tonky]

Yes- both channels - That's what I get for trusting my daughter. I distinctly remember saying "Be careful with those speaker cables"! And now she is using my original cambridge A and R A60 amp. So far it's ok!

Thanks for your advice - tonky

 

[eggontoast]

Its not all bad then, the A60 is a better sounding amp anyway.

 

[Rethep]

It was described as a very good (neutral) amp in those times, i can remember. I have auditioned it because i was looking for new speakers then (1988). They demoed the speakers with it. I also heard the Cyrus 3 when i was looking for a new amp. It sounded much too bright for me.

For 7 years i'm into valves (warm and not as tight in the bass, but what colours!) and i'm not gonna return.

Still a repair might be worth the effort because Cyrus 2's a classic, yes.

 

[tonky]

In its day it was hi fi nirvana - euphonic heaven! But by todays standards it's not powerful enough and it is a little too warm and lacking control in the bass.

tonky

 

[tonky]

It's the A60 which is overly warm and loose in the bass. The Cyrus 2 is starkly revealing (maybe too much so) and its bass wass tight,punchy and well defined.