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VTV Purifi amp models

I am considering a Purifi amp from VTV. Today I have a pretty high end SET amp (Viva Aurora monos) which I am likely to keep and a set of Tube Research Samson monos (Solid state 300W/8 ohms).  I am driving a pair of Green Mountain Audio C3-HX speakers (92-ish db efficient and first order crossovers) as well as occasionally pair of updated Klipsch Chorus II when I want to rock the house :-)  My questions are as follows: 1) Has anyone tested any of the VTV Purifi amps and if so did you have a chance to compare to other top flight    Class A or AB amps? How do the stack up sonically? I have read great technical things about the Purifi amp from Bruno and others. While I have not tested any Class D amps in my system I have been skeptical that they can deliver the musical goods. 2) In the VTV Purifi line up I can see going with the monoblocks vs the stereo so you get two power supplies instead of one. I am curious if anyone has experience with the monos with the 3000w power supply to know what else it buys you. I would of course opt for the input board that lets me pick different op amps to give me some flexibility in tailoring the sound.
 I know Ric over at EVS is modding these and am not sure if I would go down that path...So my initial interest in thestock performance. Thanks in advance for any insights.
tellefsen
georgehifi's avatar
georgehifi
10,312 posts
 
This guy has got good Purifi 1ET400A pricing which is in $au that equates to $1696usd for this stereo amp.
https://www.gumtree.com.au/s-ad/hamersley/stereo-systems/purifi-1et400a-stereo-amplifier-claas-d/125...
I'm listening at the moment to his Hypex NC500 monoblocks (Belcanto Ref 600 monos copy) but with big linear power supply.  

Cheers George
rocray's avatar
rocray
1,448 posts
 
Rookie question. Is the power supply what separates the men from the boys in class D amps? 
djones51
4,947 posts
 
No, the 3000 watt PS is used with the higher watt Ncore amps like the UcD2K with 1600 watt at 8 Ohm. The 600 or 1200 is more than enough for the Purifi 1ET400 depending on implementation.
georgehifi's avatar
georgehifi
10,312 posts
 


I have Hypex NC500 module’d monoblocks here at the moment, which are the same as the Belcanto Ref M600 monoblocks, except for they have Linear Power Supplies (LPS) instead of Switch Mode Supply (SMP) ones.
And as much as I thought the Belcanto’s Ref’s mono’s were one of the better Class-D’s that I have heard, I much prefer these, with a large linear power supply that use 3kva toroidal, fast 120A Schottky rectifiers, and 60000uF many small matrixed capacitors per channel for very low ESR.

Cheers George
oldhvymec
5,101 posts
 
Hay OP

Better to stay out of trouble, than to get out of trouble..

A larger well built PS is always a plus..

I have a Nord One up X 3. NC500s all with their own PS all with the largest they could supply at the time.
3. smps1200A400 Power supplies in the same case.
That PS is still recommended, by the pickiest in the "Hot Rod" community of class Ds.
Sparco upgrades, 1200 watt PS, a little wire here and there, it's a pretty serious, little amp.

Everything is cool, but ONE POWER CORD to supply the whole kitten Kaboodle. THAT didn’t make a lot of sense. One MAIN fuse for the whole thing. I think it was rated one amp higher, than the monoblocks.

Any ideas on that one.. If there is a power outage (not very often) coming back on THAT amp will blow a fuse, everytime. If I power it on correctly no problems, never blew a fuse playing at serious, DB levels though.

In any case, a better PS has made a few ok amps, a lot better performers, pennies on the dollars for the improvement.

PS vs PC and power conditioners, to make up for the smaller, less expensive ones installed. Don’t scrimp in the PS... A 500.00 Power Cord, and 1000.00 conditioner, won’t make up for a 200.00 vs 300.00 PS in the long run... The main reason folks need conditioners, substandard, PS...

Regards
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