Jeff Rowland 625 amp ... & 725

Very interesting Claude, I'll have to find out the scoop about the M625 update.... Next week after everyone comes back from CES in Vegas. G.

No deliberate mysteries FrenchFries... It's just that web sites are always behind the proverbial eggball... M725 has started to ship in December 2011; Last I heard, price was $28K.... As for power rating, I will learn about it coming week, but I suspect it may be around 340W per side or so. Guido

Inna, Claude lives on the other side of the Pond, hence his understandable Eurocentric concern. Guido

Claude, I believe that the new PSU Power Unit may be an external supercapacitor-based power supply that can be applied to deliver DC to Corus, Aeris, and the upcoming Criterion replacement. I do not have any details from JRDG, but knowing a little about supercapacitors, it is likely that PSU may yield a great deal of transient authority to applicable devices.

And just in case you were asking.... No, you can't apply PSU to any power amps.... Just not enough current for that.

G.

Looks like JRDG has finally posted M725 mono amp specs at:

http://jeffrowlandgroup.com/kb/questions.php?questionid=592

Purely from memory.... 330W at 8 Ohms, 640 at 4 Ohms... 1500W power supply with PFC, ceramic boards, class A/B... no overall feedback.

Guido

Claude, the external PSU device cannot be applied to power amplifiers at all.... It was designed for low current applications only. It is currently compatible with Corus and Aeris. In the future, it will be compatible with the Criterion follow-on preamplifier.

M725 is powered by an internal high speed DC SMPS fed by a 1500W PFC unit, also internal to the M725 chassis.

Guido

And just in case anyone asked... No, PSU is absolutely NOT compatible with the now withdrawn Criterion or Capri any other preamplifier... If you ever managed to connect the two by some jerry-rigging, you will likely end up with cute little fireworks, followed by even cuter blue smoke, charming smell of singed circuits, and.... not so charming knashing of teeth (your own teeth, that is). G.

Marc, as far as I know, the PSU unit shown in Vegas was an advanced prototype, not a full production unit... PSU has not been released. I have not heard of any price yet.

What I have heard about PSU is that it is a power supply based on supercapacitors instead of NiMH batteries. At least in theory, it should be capable of delivering quite a bit of authority, because supercaps are capable of very quick power surges, while NiMH batteries are not. But, until I hear the effect of PSU on a device myself, I will have no idea of what it really does for living in general, nor whether it lets Corus surpass Criterion in particular. G.

Hi Phil, I have no info on Phonostage projects at JRDG one way or another.

I know that a Criterion follow-on project is underway, but I do not know the exact release timeline. I suspect that the Criterion follow-on my utilize PSU for power supply. Guido

Oopsie Tab10s.... Sure thing.... should have been "eight-ball" not egg-ball. Afraid that English is not my mother tongue, as just transpired... On the other hand, I contend that playing pool with a fresh egg as ball number 8 should add an unexpected splattering fun factor to the old game *snickers! G.