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Old 18th May 2006, 11:26 AM   #21
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Luke
I know this is thread jacking, so feel free to ignore me, but how good are these Cyrus amps, seems the british HiFi press love them.

Quote:
Originally posted by AndrewT
Hi,
very good, even the older ones.
I have a Cyrus Two with PSX. Sounds superb for the second hand price I paid.
Although my line level only Cyrus8 is better, but does not have phono.

Oh, I wish someone would post a Cyrus Two schematic.
Hi,

I'll second AT on this.

For British kit the Cyrus2/PSX is one the best second-hand buys.
Around its price second-hand its probably the best british kit.
I wish sometimes I'd sought it out instead of getting my Audiolab 8000A.

As far as I know the circiut boards for the Cyrus 1 and 2 are identical.
I think the 2 has two pairs of output devices whilst the 1 has one pair.
Also omitted from the 1 is an IC and bits for the MC stage, instead
it has two gain settings for the MM stage. The Cyrus 1 board also
has all the connections for a PSX but not the socket.
So a Cyrus 1 would be fairly easy to upgrade with a DIY PSX.

The Cyrus 1 itself does sound good, very lively but does lack a little weight.

/sreten.
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Old 18th May 2006, 11:31 AM   #22
AndrewT is offline AndrewT  Scotland
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Hi,
replacements for C8834. I think the C is short for 2sc but the following number is too large for a valid reference. The Japanese have only reached about 5000 odd.

So maybe not 2sc.

Ignore this bit,The 243, 253 are likely to be BD243, BD253, European origin drivers. But the complement to bd243 is bd244, these are 80V 65W 6A devices. The C rated are 100V. So again I am unsure about the 253.

Richie is almost certainly right about the MJE243, MJE253. makes a lot more sense.
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Old 18th May 2006, 12:19 PM   #23
Did it Himself
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No almost about it Andrew, they are not BD but MJE devices, I have taken one apart and swapped these very components, and I have the service manual
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Old 18th May 2006, 01:01 PM   #24
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Thanks Richie,

What do you mean by "if you are brave" Will I see another explosion like what my old ones did?

cheers,

Henry
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Old 18th May 2006, 01:01 PM   #25
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Hi Richie,

you recommended the replace drivers as MFE340/MJE350.... should it not be MFE350. Pls confirm if its a typo error or not.

Henry
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Old 18th May 2006, 01:03 PM   #26
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maybe its a 2sc3884 a 600V (1400V max) 50W 6A transistor manifacured by Toshiba at f 8MHz.
Exist also the 2sc3884a .
Changes a 3 for a 5 it's a frequent mistake with transistors marking.

ciao cicero32
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Old 18th May 2006, 01:46 PM   #27
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Sorry yes a typo. MJE340 and MJE350 that should be. I don't think there's any MFE parts anyway.
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Old 18th May 2006, 01:58 PM   #28
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I really can't agree more, that the Cyrus 2 is a superb amp. I have always been playing with tube gear right from the 60's and have absolutely put aside anything transistor. All my stuff are from the vintage era.. ala... Jbl horns, Altecs, Goodmans red magnets, Tannoy Gold etc.... I was given a set of C2 with the DC power pack from a friend. Its is from the year 1988 I took it to a tech and had it serviced, changed all the caps and cleaned out the contacts. I hooked it up to a pair of vintage Altec 414a co-axle 12" speakers and got the shock of my life. The mids were excellent and the linearity, a little colder than tube had its own bounce and musicality. Coupled with the DC power pack it sounded much better, quieter and stable. The output transistors have packed up and so did one of the driver transistors. I have since grown to love this baby and is trying to restore her back to good health.
I joined today just so I could get help and opinions and I must confess you guys have been terrific, helpful and enthusiastic. Since this, the Cyrus 2 pages have grown by 2.

Thanks guys,

Henry
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Old 18th May 2006, 02:07 PM   #29
anatech is offline anatech  Canada
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Wow, the thread went crazy as I zzzz overnight.

Replace the filter caps on the LV supply, 470 uF 63V are what I use, also replace the 10 uF caps. I use 35V, there are 4 to change. Refit the heatsinks to the regulators so they are snug, use a touch of grease. That's the last thing you do.

The MJE devices are available, use them. I use TIP35C for the outputs, not the cheap TI things! You should work on the PCB while leaving the heatsink attached to the outputs.

Check the feedback caps, I see a few opening up.

These are nice amps. The Cyrus Power (newest amp) is really nice. Unlike many British designs, the schematic is very advanced and it sounds it. These guys know what they are doing. The later build quality (new models) is very high. Failure rates are very low.

So as much as the Cyrus 2 sounds nice, you should have a listen to the latest products they produce.

-Chris
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Old 18th May 2006, 02:11 PM   #30
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Quote:
Originally posted by qrius4ever
Thanks Richie,

What do you mean by "if you are brave" Will I see another explosion like what my old ones did?

cheers,

Henry
Possibly. They are 80V devices and the rails are about 40V. I have known people run devices like this, but I choose not to.

In place of the TO247 case devices you can also use MJW3281 or MJW21194 devices from OnSemi, which may be an improvement over the TIP devices.
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