Buckeye Amps: Purifi 1ET6525SA (the successor to the 1ET400A)

[goryu]

Why not build your own. Then you'll have the exact configuration you want.

Hard to justify building your own when there are companies offering these amps for less than the cost of the parts. If the manufacturers offered the modules for the price they give the assemblers it would be a no brainer.

 

[jruser]

For the case. Binding posts add another inch

Thanks for answering my questions. I’m going to budget for one 9040 and 2x stereo ncx500’s once the 9040 launches.

 

[jruser]

- OPA1612
- speakON only for rackmount case
- Hypex SMPS1200A100 standard, Micro Audio SMPS upgrqde available
- TBD for idle wattage
- likely $1150

For budgeting purposes, what’s your guess for one with the Micro Audio upgrade?

 

[Buckeye Amps]

$1200

 

[Wavez]

I'm going to look at a used pair of the monoblocks, is there any way to tell if they do or don't have the problematic binding posts from amir's original 3 channel review?

 

[Buckeye Amps]

I'm going to look at a used pair of the monoblocks, is there any way to tell if they do or don't have the problematic binding posts from amir's original 3 channel review?

Not without opening it up or asking the owner.
And as far as usage, the steel binding posts do bot affect real world usage/audible difference.

 

[Wavez]

Thanks for the quick reply. What about a serial number run or production/purchase date range?

 

[Buckeye Amps]

Thanks for the quick reply. What about a serial number run or production/purchase date range?

Any amp purchased before Feb 2023 had the steel tabs but most of the owners also opted to have me ship replacement binding posts to correct them.

 

[Buckeye Amps]

A change is a coming....

 

[tellyoulater]

Yes. The SMPS1k can have pumping if used on full range speakers under 30/40Hz. The Capacitor board eliminates this.

How can I hear or measure that pumping?

 

[Buckeye Amps]

How can I hear or measure that pumping?

You won't hear it...the amp will show a Voltage Error on the front LED if it is happening.

 

[pma]

How can I hear or measure that pumping?

What is "Power Supply Pumping"?

I recently came across the term "Power Supply Pumping" in an answer provided to me in return to one of my questions. Although I tried googling I didn't have good luck with it. I would appreciate if

electronics.stackexchange.com

and TI pdf

https://www.ti.com/lit/an/slyt199/slyt199.pdf

 

[tellyoulater]

You won't hear it...the amp will show a Voltage Error on the front LED if it is happening.

It's a Purifi DIY so I don't think that would happen...

 

[Matias]

A change is a coming....

Is this your line that is changing or something to do with the Purifi 1ET400A modules themselves?

 

[Buckeye Amps]

It's a Purifi DIY so I don't think that would happen...

Ohhh. Apologies. Yea our amps would report if voltages are out of tolerance (pumping, sag, etc).

 

[Buckeye Amps]

Is this your line that is changing or something to do with the Purifi 1ET400A modules themselves?

With the Purifi modules themselves.

Just waiting on the OK from Purifi to share full details. Needless to say it won't be too long.

 

[restorer-john]

Yes. The SMPS1k can have pumping if used on full range speakers under 30/40Hz. The Capacitor board eliminates this.

Why not simply invert one channel with respect to the other and reverse it at the loudspeaker terminals in a stereo amp. Bass content is pretty much always in phase and that way, you pull from opposite rails.
NAD have done that (and still do) for many decades. It is a classic way to use an underrated power supply and get away with it. Also, channel separation can improve as bonus, depending on how you test it.
It also costs nothing...

 

[Buckeye Amps]

Why not simply invert one channel with respect to the other and reverse it at the loudspeaker terminals in a stereo amp. Bass content is pretty much always in phase and that way, you pull from opposite rails.
NAD have done that (and still do) for many decades. It is a classic way to use an underrated power supply and get away with it. Also, channel separation can improve as bonus, depending on how you test it.
It also costs nothing...

If it was a stereo amp build, of course.

 

[perceptionist]

With the Purifi modules themselves.

Just waiting on the OK from Purifi to share full details. Needless to say it won't be too long.

Shall we wait till 2025?

 

[Buckeye Amps]

Shall we wait till 2025?

Definitely not that long