It lives, Igor!!
 

Well, it looks like the Cyrus Two has been brought back from the dead.
Rather, once I had a look at the Cyrus One schematic, I managed to work out
that the blown components were all in the phono circuitry - the regulators
mentioned in the previous thread aren't used in the main amp, just for the
turntable inputs.

Since I don't have a turntable, and never will, I desoldered the diodes for
the phono PSU and set about checking the smoothing circuit for the main PSU.
I had already checked that the transformer was putting out convincing AC, I
took out the fuses and reconnected the transformer to see if the main PSU
was doing what it should - looks like it delivers 40Vdc. I put the fuses
back in, plugged in a sine wave and the scope showed a signal on the speaker
outputs.

Bloody hell! It was only in a coma!

I've just dragged the little Wharfdale speakers out of the bedroom,
connected them up, and plugged in a portable minidisk - yup, it definitely
works! Next step is to put it back together again and connect it to the
hi-fi. I've always wondered how this amp would sound with my speakers, so it
looks like I'll be finding out soon. Watch this space for a little review to
assess how it sounds, and how it compares to the valve amp I currently
use...


--
Wally
www.artbywally.com
www.wally.myby.co.uk

It lives, Igor!!
 

In article ,
Wally wrote:
Well, it looks like the Cyrus Two has been brought back from the dead.
Rather, once I had a look at the Cyrus One schematic, I managed to work
out that the blown components were all in the phono circuitry - the
regulators mentioned in the previous thread aren't used in the main amp,
just for the turntable inputs.

Probably easy to guess. Regulators for the main amp wouldn't be a common
type due to the current involved.

--
*Why is the word abbreviation so long?

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

It lives, Igor!!
 

Dave Plowman (News) wrote:

Well, it looks like the Cyrus Two has been brought back from the
dead. Rather, once I had a look at the Cyrus One schematic, I
managed to work out that the blown components were all in the phono
circuitry - the regulators mentioned in the previous thread aren't
used in the main amp, just for the turntable inputs.

Probably easy to guess. Regulators for the main amp wouldn't be a
common type due to the current involved.

Good point. I don't have the tech specs for it, but the box says it does
60Wpc, and can deliver in excess of 60 amps pk-pk, but doesn't say if the
current is per channel or overall.


--
Wally
www.artbywally.com
www.wally.myby.co.uk