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Buckeye Amps: 2nd Generation Purifi EIGANTAKT 1ET9040BA Amplifier

Ra1zel

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Rated power unreachable with those PSUs
 

amper42

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Dylan,
What would the expected measurable power limits be for the Buckeye 9040BA build with the Hypex SMPS1200A100
at 8 ohms, 4 ohms and 2 ohms? Thank you.


 Hypex SMPS1200A100.png
 
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Buckeye Amps

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Dylan,
What would the expected measurable power limits be for the Buckeye 9040BA build with the Hypex SMPS1200A100
at 8 ohms, 4 ohms and 2 ohms? Thank you.


View attachment 368881
We've been measuring them but I may be switching to the SMPS1200A180. I just want to do some more testing before making final decision since the A180 can theoretically exceed the max voltage of the 9040. Which wouldn't be destructive but if it happens would cause shutdown and obviously don't want that to be a scenario that occurs even if rare.

To be continued
 

valerianf

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Looking at the 2 datasheets the OPA1612 (1.1 nV/√Hz) has a far better noise floor than the OPA1656 (4.3 nV/√Hz).
May be it is not something that we can hear but the difference is significant.
 
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Buckeye Amps

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Looking at the 2 datasheets the OPA1612 (1.1 nV/√Hz) has a far better noise floor than the OPA1656 (4.3 nV/√Hz).
May be it is not something that we can hear but the difference is significant.
Yea. This has been discussed elsewhere by others (not saying that in a dismissive tone).
But the impression is that the 1656 is the preferred OP Amp to use with the 9040 per the designer himself, Bruno.

At the very end of the day neither will have any audible impact over the other.
 

amper42

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Confirmed we will be using the Hypex SMPS1200A180 for our standard build.

Dylan,
How many watts are used with the Buckeye 9040BA and SMPS1299A180 config. while idle? Thank you.
 
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Is there merit in slightly increased gain relative to a 1ET400 Amplifier so that the new amplifier can be driven to its full power direct from a 4V XLR DAC output?
4V will drive the 9040 to full power in High gain mode, yes.

High gain for the 9040 at 4ohm requires 2.9V
 
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shion_ca

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4V will drive the 9040 to full power in High gain mode, yes.

High gain for the 9040 at 4ohm requires 2.9V
I actually would look for some lower gain values as I'd like some more volume granularity from my pre-amp (it currently has a choice of volume 6 a little too quiet or 7 a little too loud). So with a lower gain I could have more options between those two. May I ask what the gain options will be? (and you have the wonderful option to choose externally by some selector right?)
 

Ashrum

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Any future plans after the mono blocks to offer 1ET9040BA or 1ET7040SA in a 2 channel amp? Thinking of bi-amping Arendal 1723 Towers in my home theater. I considered the PURIFI 1ET400A 2 channel amp but was thinking they would benefit from the more power head room of the 1ET9040BA or 1ET7040SA. I also think the the extra capacitor board offered on these amps my benefit the amp powering the low end on the speakers as have my preamp to send the low end frequencies to both my front and subwoofers.
 

EdW

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Any future plans after the mono blocks to offer 1ET9040BA or 1ET7040SA in a 2 channel amp? Thinking of bi-amping Arendal 1723 Towers in my home theater. I considered the PURIFI 1ET400A 2 channel amp but was thinking they would benefit from the more power head room of the 1ET9040BA or 1ET7040SA. I also think the the extra capacitor board offered on these amps my benefit the amp powering the low end on the speakers as have my preamp to send the low end frequencies to both my front and subwoofers.
The 1ET7040 offers marginally more power than the 1ET400 and then only when powered with a */-70V SMPS. It can however drive into low impedance speaker loads whereas the 1ET400 is best suited to speaker loads from 3 Ohms upwards if you want voltage clip to be the limit rather than current limit.

So I found this review of the Arendel 1723 tower on Audioholics


seems like the Arendel is an easy 4 Ohm load so unless you want the increased 2dB or so of power of the 1ET9040 then a 1ET400 solution is very suitable.
You will receive no advantage bi-amping. None whatsoever. Just buy decent speaker cables. If the run is short (say less than 4m) then 12AWG cable is good otherwise go to the thicker 10AWG. This is a very conservative recommendation for a relatively high impedance speaker like the Arendel. Obviously don’t buy from boutique suppliers of cable but look at Blue Jeans Cable etc.

EDIT: also don’t waste money bi-wiring - no advantage either. Just an extra trip hazard!
 
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Ashrum

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So you don't think I would benefit from bi-amping vs a single mono-block amp per speaker? I currently have them to 2 Emotiva mono block amps rated 600rms 4ohms, i though i though about moving the mono blocks to another system and using the 1ET9040BA to power them. I currently using bluejeans cable 10AWG as the run is 26ft to the speakers.
 

EdW

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So you don't think I would benefit from bi-amping vs a single mono-block amp per speaker? I currently have them to 2 Emotiva mono block amps rated 600rms 4ohms, i though i though about moving the mono blocks to another system and using the 1ET9040BA to power them. I currently using bluejeans cable 10AWG as the run is 26ft to the speakers.
if you look through the ASR website you will see several contributors saying that bi-amping confers no benefit. But look at what @Buckeye Amps says on the subject


. . great honest advice

If you had very expensive loudspeakers (think Revel Salon 2 etc. here) then considering a 1ET9040 solution would be justified.
Perhaps consider also whether a stereo 1ET400 solution would work well. It could save money and the crosstalk from the stereo power amp will be better than most AV systems
 
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