Cyrus 1 amp.
 

Anyone know these well? Good, average or indifferent?

I've got one in for repair (intermittent on one channel) and would like to
know if it's worth much bother repairing, as it's quite scruffy too.

--
*Age is a very high price to pay for maturity.

Dave Plowman London SW
To e-mail, change noise into sound.

Cyrus 1 amp.
 

"Dave Plowman (News)" wrote in
message

Anyone know these well? Good, average or indifferent?

It is a very low powered amplifier that AFAIK is not held in high esteem by
audiophiles, for what that is worth.

I've got one in for repair (intermittent on one channel)
and would like to know if it's worth much bother
repairing, as it's quite scruffy too.

Schmatics, etc. here"

http://www.tcaas.btinternet.co.uk/index-4.htm


Looks like a nice little power amp for driving small speakers to modest
levels, headphones, etc.

Cyrus 1 amp.
 

In article ,
Arny Krueger wrote:
"Dave Plowman (News)" wrote in
message

Anyone know these well? Good, average or indifferent?

It is a very low powered amplifier that AFAIK is not held in high esteem
by audiophiles, for what that is worth.

There's no spec on it other than the usual mains supply which states 100
watts max - and by the size of the transformer I'd guessed it wasn't very
high power.

I've got one in for repair (intermittent on one channel)
and would like to know if it's worth much bother
repairing, as it's quite scruffy too.

Schmatics, etc. here"

http://www.tcaas.btinternet.co.uk/index-4.hem

I've just found this by Googling. ;-) Says it's a 'classic commercial
design' (on a basically class A site) so perhaps it is good within its
limitations. I've got a NAD 3020 mentioned on the same page and that's a
nice sounding little unit.


Looks like a nice little power amp for driving small speakers to modest
levels, headphones, etc.

I'll go ahead and fix it then. The fascia panel has been bashed at some
time and the fixings broken - such that the on/off switch no longer can be
operated, so it will need some mechanical sorting too. But I don't mind if
it's a half decent design.

--
*Do infants enjoy infancy as much as adults enjoy adultery? *

Dave Plowman London SW
To e-mail, change noise into sound.

Cyrus 1 amp.
 

I used to have a Cyrus II, which is similar sounding but a little more
powerful.
They are by no means transparent but not bad little units.
Stereo separation is very good and the detail is pretty good for what they
are but they are very aggressive sounding, so need to be partnered with some
nice warm speakers.

D

Cyrus 1 amp.
 

On 26/03/2011 2:38 a.m., Dave Plowman (News) wrote:
In ,
Arny wrote:
"Dave Plowman wrote in
message

Anyone know these well? Good, average or indifferent?

It is a very low powered amplifier that AFAIK is not held in high esteem
by audiophiles, for what that is worth.

There's no spec on it other than the usual mains supply which states 100
watts max - and by the size of the transformer I'd guessed it wasn't very
high power.

I've got one in for repair (intermittent on one channel)
and would like to know if it's worth much bother
repairing, as it's quite scruffy too.

Schmatics, etc. here"

http://www.tcaas.btinternet.co.uk/index-4.hem

I've just found this by Googling. ;-) Says it's a 'classic commercial
design' (on a basically class A site) so perhaps it is good within its
limitations. I've got a NAD 3020 mentioned on the same page and that's a
nice sounding little unit.


Looks like a nice little power amp for driving small speakers to modest
levels, headphones, etc.

I'll go ahead and fix it then. The fascia panel has been bashed at some
time and the fixings broken - such that the on/off switch no longer can be
operated, so it will need some mechanical sorting too. But I don't mind if
it's a half decent design.

Dave,
If you want a copy of the service manual, let me know & I'll email you a copy.

Mike

Cyrus 1 amp.
 

In article ,
Mike Coatham wrote:
If you want a copy of the service manual, let me know & I'll email you a
copy.

Thanks Mike. I've found the schematics online and have taken it apart ok.
One channel appears to be distorting ever so slightly - after cleaning the
selector switch which cured the intermittent on one channel. The 'faulty'
amp is reading a DC offset of 0.04V - the other zero. Haven't looked on
the scope yet. There doesn't appear to be any presets for standing
current - so would the manual help? If so I'd be grateful.

Email address in the sig.

--
*Dancing is a perpendicular expression of a horizontal desire *

Dave Plowman London SW
To e-mail, change noise into sound.

Cyrus 1 amp.
 

On 26/03/2011 12:01 p.m., Dave Plowman (News) wrote:
In ,
Mike wrote:
If you want a copy of the service manual, let me know& I'll email you a
copy.

Thanks Mike. I've found the schematics online and have taken it apart ok.
One channel appears to be distorting ever so slightly - after cleaning the
selector switch which cured the intermittent on one channel. The 'faulty'
amp is reading a DC offset of 0.04V - the other zero. Haven't looked on
the scope yet. There doesn't appear to be any presets for standing
current - so would the manual help? If so I'd be grateful.

Email address in the sig.

Manual sent - the quiescent current trimpots are RV2/3 and are 'hidden'
under that flat ribbon cable - hence hard to see.

Cheers

Mike

Cyrus 1 amp.
 

In article ,
Mike Coatham wrote:
On 26/03/2011 12:01 p.m., Dave Plowman (News) wrote:
In ,
Mike wrote:
If you want a copy of the service manual, let me know& I'll email you a
copy.

Thanks Mike. I've found the schematics online and have taken it apart
ok. One channel appears to be distorting ever so slightly - after
cleaning the selector switch which cured the intermittent on one
channel. The 'faulty' amp is reading a DC offset of 0.04V - the other
zero. Haven't looked on the scope yet. There doesn't appear to be any
presets for standing current - so would the manual help? If so I'd be
grateful.

Email address in the sig.

Manual sent - the quiescent current trimpots are RV2/3 and are 'hidden'
under that flat ribbon cable - hence hard to see.

Great - I found them after removing the ribbon this morning. I've been
repairing the fixings for the front panel - two of the three at the bottom
were broken, stopping the switch mechanism working.


But the manual hasn't arrived - you did notice the spam trap in the
address?
'davenoise' won't bounce - but I haven't set up any access to that box.
Only 'davesound'.

--
*In some places, C:\ is the root of all directories *

Dave Plowman London SW
To e-mail, change noise into sound.

Cyrus 1 amp.
 

On 26/03/2011 11:50 p.m., Dave Plowman (News) wrote:
In ,
Mike wrote:
On 26/03/2011 12:01 p.m., Dave Plowman (News) wrote:


Great - I found them after removing the ribbon this morning. I've been
repairing the fixings for the front panel - two of the three at the bottom
were broken, stopping the switch mechanism working.


But the manual hasn't arrived - you did notice the spam trap in the
address?
'davenoise' won't bounce - but I haven't set up any access to that box.
Only 'davesound'.


You should have the manual now - I did see the spam trap, but forgot to
change the address line.

Cyrus 1 amp.
 

In article ,
Mike Coatham wrote:
But the manual hasn't arrived - you did notice the spam trap in the
address?
'davenoise' won't bounce - but I haven't set up any access to that box.
Only 'davesound'.


You should have the manual now - I did see the spam trap, but forgot to
change the address line.

Yes - got it now thanks and it has all the info I need. The URL given by
Arny for the schematic is for the later version with no trim pots. I gave
up looking for another. ;-)

--
*There's no place like www.home.com *

Dave Plowman London SW
To e-mail, change noise into sound.

Cyrus 1 amp.
 

On Fri, 25 Mar 2011 15:58:10 -0000, "David"
wrote:

I used to have a Cyrus II, which is similar sounding but a little more
powerful.
They are by no means transparent but not bad little units.
Stereo separation is very good and the detail is pretty good for what they
are but they are very aggressive sounding, so need to be partnered with some
nice warm speakers.

D


I have a Cyrus II right here, playing now, and I can assure you that
the above is the purest gibberish. Frequency response is ruler flat
from 1Hz up, and distortion is as low as any comparable amplifier. It
has never shown any sign of aggression in all the years I have owned
it despite occasional provocation, and it reproduces faithfully every
detail fed into it.

d

Cyrus 1 amp.
 

"Don Pearce" wrote in message

On Fri, 25 Mar 2011 15:58:10 -0000, "David"
wrote:

I used to have a Cyrus II, which is similar sounding but
a little more powerful.
They are by no means transparent but not bad little
units.
Stereo separation is very good and the detail is pretty
good for what they are but they are very aggressive
sounding, so need to be partnered with some nice warm
speakers.

D


I have a Cyrus II right here, playing now, and I can
assure you that the above is the purest gibberish.

It is possible that a person who is used to non-flat power amps might find a
flat response power amp to be too agressive.

Frequency response is ruler flat from 1Hz up, and
distortion is as low as any comparable amplifier.

A quick glance at the schematic shows corner frequencies outside of the
normal audible range. IOW, subjectively uncolored.

It has never shown any sign of aggression in all the years I
have owned it despite occasional provocation, and it
reproduces faithfully every detail fed into it.

We've got people around here who seem to affect speakers that are about as
non-flat as possible, so all kinds of unusual perceptions are possible.

Cyrus 1 amp.
 

In article ,
Don Pearce wrote:
On Fri, 25 Mar 2011 15:58:10 -0000, "David"
wrote:

I used to have a Cyrus II, which is similar sounding but a little more
powerful. They are by no means transparent but not bad little units.
Stereo separation is very good and the detail is pretty good for what
they are but they are very aggressive sounding, so need to be
partnered with some nice warm speakers.

D


I have a Cyrus II right here, playing now, and I can assure you that
the above is the purest gibberish. Frequency response is ruler flat
from 1Hz up, and distortion is as low as any comparable amplifier. It
has never shown any sign of aggression in all the years I have owned
it despite occasional provocation, and it reproduces faithfully every
detail fed into it.

It might be some would describe the channel I had with out of spec low
quiescent current as 'aggressive'. I just called it distortion.

Listened to it off and on all of yesterday after fixing it. Replacing the
WS amp which is a home built 150W per channel mosfet. And sounds nice to
me. The Cyrus1 sounded no different.

--
*Certain frogs can be frozen solid, then thawed, and survive *

Dave Plowman London SW
To e-mail, change noise into sound.

Cyrus 1 amp.
 

"Don Pearce" wrote in message
...
On Fri, 25 Mar 2011 15:58:10 -0000, "David"
wrote:

I used to have a Cyrus II, which is similar sounding but a little more
powerful.
They are by no means transparent but not bad little units.
Stereo separation is very good and the detail is pretty good for what they
are but they are very aggressive sounding, so need to be partnered with
some
nice warm speakers.

D


I have a Cyrus II right here, playing now, and I can assure you that
the above is the purest gibberish. Frequency response is ruler flat
from 1Hz up, and distortion is as low as any comparable amplifier. It
has never shown any sign of aggression in all the years I have owned
it despite occasional provocation, and it reproduces faithfully every
detail fed into it.

d

It's really odd the way some products get reputations that have nothing to
do with any technical performance. Quad amplifiers are smooth, Cyrus is
aggressive, Naim has PRaT, valves are warm, SETs are detailed and so on.

I blame the parents!..or is that the magazines?

S.

Cyrus 1 amp.
 

On Mon, 28 Mar 2011 18:03:06 +0100, "Serge Auckland"
wrote:


"Don Pearce" wrote in message
...
On Fri, 25 Mar 2011 15:58:10 -0000, "David"
wrote:

I used to have a Cyrus II, which is similar sounding but a little more
powerful.
They are by no means transparent but not bad little units.
Stereo separation is very good and the detail is pretty good for what they
are but they are very aggressive sounding, so need to be partnered with
some
nice warm speakers.

D


I have a Cyrus II right here, playing now, and I can assure you that
the above is the purest gibberish. Frequency response is ruler flat
from 1Hz up, and distortion is as low as any comparable amplifier. It
has never shown any sign of aggression in all the years I have owned
it despite occasional provocation, and it reproduces faithfully every
detail fed into it.

d

It's really odd the way some products get reputations that have nothing to
do with any technical performance. Quad amplifiers are smooth, Cyrus is
aggressive, Naim has PRaT, valves are warm, SETs are detailed and so on.

I blame the parents!..or is that the magazines?

S.

It is something like anthropomorphism - but I can't put my finger on
the right word.

d

Cyrus 1 amp.
 

In article , Serge Auckland
wrote:

It's really odd the way some products get reputations that have nothing
to do with any technical performance.

Quad amplifiers are smooth,

Band limited

Cyrus is aggressive,

Pass.

Naim has PRaT,

I thought that was the reviewers... oops, sorry. I mean

risk of bursts of HF instability, tailored response, moderately high output
impedance.

valves are warm,

Don't touch. More than warm.

SETs are detailed

Big valves. Labels easier to read.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
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