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

[Buckeye Amps]

Purifi 1ET6525SA Power Specs:
230w into 8ohm
450w into 4ohm
510w into 2ohm

Custom Input Buffer Board w/:
- Neutrik XLR connectors
- 5-way gold plated binding posts
- OPA1612 OP Amp
- TI TPS7A30/49 Voltage Regulators
- Low, Med, High Gain settings
- Clipping Indication (via Front Power LED)
- Error Indication (via Front Power LED)
- Muted Soft-start/shutdown (minimizes speaker “pop” when turning on and off)
- Auto On/Off (along with Always On and 12v options)

Gain settings:
4ohm - 25dB/2.2Vrms (High), 20dB/3.9Vrms (Medium), 15dB/6.9Vrms (Low)
8ohm - 25dB/2.3Vrms (High), 20dB/4.0Vrms (Medium), 15dB/7.1Vrms (Low)

1ET6525SA 2ch Amplifier:
(2) Purifi 1ETxxxxSA modules
(1) Hypex SMPS1200A400
10"x13"x3.5" Aluminum case

1ET6525SA 3ch Amplifier:
(3) Purifi 1ETxxxxSA modules
(1) Hypex SMPS1200A400
14"x14"x3.5" Aluminum case

*Rackmount case upgrade available

*Free US Shipping
*International shipping available

Email directly ([email protected]) for buying or if you have any questions at all

Visit our website for up to date specs, pricing, and pictures:
Buckeye Amps Official Site

 

[Buckeye Amps]

So, the current approach is either going to be using the stock Purifi EVAL1 setup with an SMPS1200A400 OR using the Neurochrome Input Buffer

As of right now, using this thread to gather interest and whether the EVAL1 board is perfectly suited or if the Neurochrome is the better way to go.
Remember, my builds are meant to get the sound as "uncolored" as possible, so I would not be using any type of custom or aftermarket OP Amps.

 

[thegeton]

Definitely interested in the Neurochrome version...

 

[beren777]

I'd be interested in seeing a x3 L/C/R build with the modules oriented vertically on heat sink trays, or the traditional horizontal orientation if vertical would be too tall. They could probably all share one SMPS1200A400 with a three-way splitter and still be fine for most purposes.

Would the Neurochrome do anything better than the EVAL1 or EVAL2 buffers?

 

[Buckeye Amps]

Definitely interested in the Neurochrome version...

I think I am going to go the Neurochrome route. It seems straightforward and well regarded.

 

[Buckeye Amps]

I'd be interested in seeing a x3 L/C/R build with the modules oriented vertically on heat sink trays, or the traditional horizontal orientation if vertical would be too tall. They could probably all share one SMPS1200A400 with a three-way splitter and still be fine for most purposes.

Would the Neurochrome do anything better than the EVAL1 or EVAL2 buffers?

Depending on what people are willing to pay, this could be an option.

 

[Doodski]

I think I am going to go the Neurochrome route. It seems straightforward and well regarded.

The Eval 1 PCB has all those connectors mounted on it and that can be a bad thing because the solder joints and copper traces break off the PCB when flexed. Not saying they will all fail although there is a reason better amps have separate connectors mounted on the chassis.

 

[Buckeye Amps]

The Purifi Eigentakt Stereo amp with OPA1612 differential input buffer has been measured and it's the standard that I really like. Has Amir measured the Purifi with the Neurochrome Input Buffer? If so, what's the link? Thank you!

I couldn't find a review. Maybe I'll be the first for Amir to review with the Neurochrome?

 

[thegeton]

I also like the possibility of an OPA1612 differential input buffer as well.

 

[Madjalapeno]

I'm building a multichannel NC500 based amp and am using the Neurochrome boards. @tomchr is great to work with.

 

[Madjalapeno]

Depending on what people are willing to pay, this could be an option.

When I have the design done I'll send you my CAD

 

[Buckeye Amps]

A fellow member reached out to me just now on designing a custom input buffer board using the OPA1612. Will keep everyone updated.

 

[goryu]

I would be interested in a stereo amp with xlr's, speakons, and the Purifi buffer. As good as the neurochrome is, I doubt it has any audible benefits over the Purifi buffer.

 

[Buckeye Amps]

I would be interested in a stereo amp with xlr's, speakons, and the Purifi buffer. As good as the neurochrome is, I doubt it has any audible benefits over the Purifi buffer.

Depending on pricing, I actually might not use the EVAL1 Purifi buffer. I am looking into an alternative board built around the OPA1612 and possibly having auto sense on/off technology

 

[Dundas]

+1 for a 3 channel Neurochrome build.
With this buffer you could easily provide the option of either XLR or RCA inputs.

 

[Buckeye Amps]

The custom board I am exploring would have Auto Sensing On/Off

 

[Dundas]

The custom board I am exploring would have Auto Sensing On/Off

Would not want to pay more for that. Proper trigger control is the only way to go.

 

[Buckeye Amps]

Would not want to pay more for that. Proper trigger control is the only way to go.

I can do proper trigger control as well, have a toggle switch for always on, trigger, or auto sense

 

[Matias]

I only suggest to keep in mind that the more powerful Purifi module is just about to be released when designing the chassis you could have it work for both options (1 PS + 2 standard modules or 1 PS + 1 high power module).

 

[bo_knows]

I would be interested in a Purifi amp that has RCA inputs as well and it can be fully driven by 2V coming from Denon Receiver. I believe Apollon has such a design.