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Buckeye Amps: 2nd Generation Purifi EIGANTAKT 1ET9040BA Amplifier

Buckeye Amps

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Announcing our new Purifi 2nd generation EIGENTAKT 1ET9040BA Monoblock amplifier!

Purifi rated specs (0.1% THD):
  • 375w @ 8ohm
  • 750w @ 4ohm
  • 1400w @ 2ohm
40A output current

Custom Input Board:
  • Neutrik XLR connectors
  • Gold plated 5-way speaker binding posts
  • OPA1656 Input Stage
  • TI TPS7A49/30 Voltage Regulators
  • Clipping Indication (via front power LED)
  • Error Indication (via front power LED)
  • Auto Sensing On/Off
Variable Gain Settings:
4 ohm - 25.5dB/2.9Vrms (High), 20.5dB/5.2Vrms (Medium), 15.5dB/9.2Vrms (Low)
8 ohm - 25.5dB/2.9Vrms (High), 20.5dB/5.2Vrms (Medium), 15.5dB/9.2Vrms (Low)

Case dimensions are 12" W x 13" D x 3.5" H

Standard configuration with a Hypex SMPS1200A180 = MSRP $1150
Upgrade configuration with a Micro Audio SMPS1300 = MSRP $1250

Updated ETA for preorders to be provided soon
 

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Last edited:
Goodness - so much clean power for less than $1300, the size of a stack of about 15 LPs. Crazy.
 
I’m down I got some jbls rated at 1500 watts and right now I’m running the gan1 which sounds pretty amazing already. But I might want to bump up the powah!
 
Is there an option to leave the amps idle-ing in a warm state? What does the auto on/off do?

Evan you remind us of the configurable gain options?
 
Auto On/Off turns the amp on automatically when a signal is detected over the Ch1 input and turns off when the signal level drops below a threshold for more than ten minutes.
It is user selectable.

Otherwise the amp can be left on indefinitely or a 12v trigger cable can also be used
 
Will there also be a bi-wiring version (see also datasheet para. 2.3.2)?
Is the modification (blue wire) also available in the series?
The blue wire is there as this is one of our prototype boards.

Can also probably add bi wiring ability though not really necessary
 
Some good news:

Since we decided to make the input board for the Purifi 9040BA a standalone board (and not make it an all purpose board that supports all other mono builds we offer) we have switched the OP amp to the TI OPA1656.
 
Some good news:

Since we decided to make the input board for the Purifi 9040BA a standalone board (and not make it an all purpose board that supports all other mono builds we offer) we have switched the OP amp to the TI OPA1656.
What features and benefits does this OP amp provide?
 
What features and benefits does this OP amp provide?
When compared to the OPA1612, nothing audible. It is mainly a switch to be more in line with what Bruno recommends and what the community expects.

If measuring, one advantage of the 1656 over the 1612 is higher impedance.
 
When compared to the OPA1612, nothing audible. It is mainly a switch to be more in line with what Bruno recommends and what the community expects.

If measuring, one advantage of the 1656 over the 1612 is higher impedance.

Another feature is the OPA1656 is less than half the cost of the 1612. :cool:
 
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