Buckeye Amps: 2nd Generation Purifi EIGENTAKT 1ET9040BA Amplifier

[Buckeye Amps]

Curious as to the sinad of the amp at different gain levels. I recall several amps tested here in which the performance was shown to be best without any buffer, which actually degraded performance. What, if any, effect, does higher levels of gain from the buffer have on performance? While likely inaudible in any case, it would be nice to see some measurements.

Will have final measurements hopefully next week.

We are modifying one of the boards to test the OPA1612 in place of the OPA1656. While inaudible, the 1656 does have slightly higher noise than the 1612. And after talking with Purifi we also learned that Bruno's original comment recommending the 1656 was taken out of context...Purifi themselves still use the 1612 on their EVAL boards.

Just want to make sure the best possible product is being put out. This won't result in any major delays, just a few extra days to test.

 

[shion_ca]

No chance to make it plug cable so us voodoo believers can tube…err…op amp role?

 

[Buckeye Amps]

No chance to make it plug cable so us voodoo believers can tube…err…op amp role?

No, still not socketed

 

[pogo]

Just want to make sure the best possible product is being put out.

Will there also be a version with a better psu in the future that can unleash the performance potential of the purifis?

 

[yys310]

The average listener uses less than 10W for normal playback levels, but many people think they absolutely need 400W even though they couldn't stand being in the room at less than half that SPL. It would be funny if modern amps had an LED on the front that displayed the amount of watts in use. People would start to realize how bizarre the request for 1200W is.

There's a demonstration video by Harbeth which shows peak power ~700-800W into their speaker.
Their speaker has low sensitivity and the room is huge.
Also it's the peak power.

 

[pogo]

There's a demonstration video by Harbeth which shows peak power ~700-800W into their speaker.

And they can still have a normal conversation at the same time

 

[Julf]

The point being that volume control on many contemporary DACs are more satisfactory than older low bit DACs, and can be more suitably matched with appropriate amplification.
Perhaps, we should return to the original subject at hand?

Right. But no matter what the volume control in the DAC, a decibel or two in gain makes no real difference.

 

[Buckeye Amps]

Will there also be a version with a better psu in the future that can unleash the performance potential of the purifis?

We offer a Micro Audio SMPS as a step up.

 

[pogo]

We offer a Micro Audio SMPS as a step up.

What improvements can be achieved with this psu?

 

[Buckeye Amps]

What improvements can be achieved with this psu?

More stable voltage on the rails to achieve higher peak power over the Hypex SMPS. Along with higher total power output to maximize the 2ohm peak wattage rating.

We'll provide comparison measurements of both to show the differences.

 

[tmtomh]

There's a demonstration video by Harbeth which shows peak power ~700-800W into their speaker.
Their speaker has low sensitivity and the room is huge.
Also it's the peak power.

If it’s the video I’m thinking of, I believe it was questioned and/or debunked in another thread here.

 

[pogo]

amirm:
I listen loud enough that my 1000 watt amplifiers completely run out of power! Remember, the first few watts incrementally get quite a bit louder. But doubling from 500 to 1000 watts is nothing. The curve flattens quickly.....

 

[Julf]

amirm:
I listen loud enough that my 1000 watt amplifiers completely run out of power! Remember, the first few watts incrementally get quite a bit louder. But doubling from 500 to 1000 watts is nothing. The curve flattens quickly.....

Doubling from 500 W to 1000 W is just as much increase as doubling from 1 W to 2 W.

 

[pma]

Yes, just 3dB .

 

[tmtomh]

This thread is getting off topic (and dumb, and tedious).

 

[yys310]

let's see who started it...

 

[yys310]

We offer a Micro Audio SMPS as a step up.

SMPS1k-SN?

 

[Buckeye Amps]

SMPS1k-SN?

Yes

 

[pogo]

SMPS1k-SN

@+VP/-VP Power Stage, rail voltage +46V/-46V?

 

[MicroAudio]

+-46.75VDC to be more accurate