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Buckeye Amps: Purifi Mono, 2ch, and 3ch Official Thread

Buckeye Amps

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Our brand new mono, 2ch, and 3ch Purifi amplifiers are now available!

Purifi 1ET400A specs:
- 425w @ 4ohm
- 225w @ 2ohm

Purifi 1ET7040SA specs:
- 950w @ 2ohm
- 500w @ 4ohm
- 250w @ 8ohm

Custom Input Buffer Board w/:
- Neutrik XLR connectors
- OPA1612 Input Stage
- TI TPS7A49/30 Voltage Regulators
- Clipping Indication
- Error Indication
- Soft-start
- Low, Med, High Gain settings
- Auto On/Off (along with Always On and 12v options)

Gain settings:
4ohm - 25.5dB/2.17Vrms (High), 20.5dB/3.89Vrms (Medium), 15.5dB/6.93Vrms (Low)
8ohm - 25.5dB/2.24Vrms (High), 20.5dB/4.02Vrms (Medium), 15.5dB/7.16Vrms (Low)

Mono Amplifier:
(1) Purifi 1ET400A OR 1ET7040SA module
(1) Hypex SMPS1200A400
7"x11"x3" Aluminum chassis
Neutrik XLR inputs
Standard 5-way Binding Post outputs
$779 (1ET400A)
$949 (1ET7040SA)

2ch Amplifier:

(2) Purifi 1ET400A modules
(1) Hypex SMPS1200A400
10"x12"x3.5" Aluminum chassis
Neutrik XLR inputs
Standard 5-way Binding Post outputs
$1189

3ch Amplifier:

(3) Purifi 1ET400A modules
(1) Hypex SMPS1200A400
12"x12"x3.5" Aluminum chassis
Neutrik XLR inputs
Standard 5-way Binding Post outputs
$1699

*speakON upgrade available for $50
*Rackmount case upgrade available for $150
*Free US Shipping
*International shipping available

Finally, the official Buckeye Amps Website!
 
Last edited:
OP
Buckeye Amps

Buckeye Amps

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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.
 

beren777

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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?
 
OP
Buckeye Amps

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Definitely interested in the Neurochrome version...
I think I am going to go the Neurochrome route. It seems straightforward and well regarded.
 
OP
Buckeye Amps

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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

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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.
 

amper42

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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!
 
OP
Buckeye Amps

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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

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

Madjalapeno

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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 ;)

index.php
 

amper42

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I'm looking for Stereo Purifi amps. No need for heat sinks. The Purifi design runs amazingly cool. My P452 never gets warm in it's aluminum case. The NC502MP generates quite a bit more heat so I can see the value heat sinks might add there with long hours of use. But if Buckeye is trying to keep cost down on the Purifi build - heat sinks will increase prices and may not make much of a difference with a stereo Purifi design.
 
OP
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A fellow member reached out to me just now on designing a custom input buffer board using the OPA1612. Will keep everyone updated.
 

goryu

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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.
 
OP
Buckeye Amps

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

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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
 
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