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

Initial custom buffer design/pricing is done (very happy about the price). Not at all finalized, but would be using TI TPS7A49/30 voltage regulators, OPA1612, toggle switch for either "Norrmal" or "Low" gain (26dB/20dB range), slide switch for "On" "12v Trigger" "Auto Sense", PCB mounted Neutrik XLR connectors (with correct Pin 1 wiring), FastOns for connecting my own speaker binding posts (so can easily allow speakON option), Power LED....among other things.

The Hypex SMPS1200A400 is out of stock until end of April unfortunately. Would make a prototype hopefully in May to undergo testing (including tests similar to what Amir does to verify the input board performance, etc). So, fingers crossed, POSSIBLY June/July availability. Not going to take pre orders until the prototype is done and verified.

For a 2ch Purifi, I am shooting for a price range around $1129.
 
Last edited:
Hmmm, I was considering the VTV Purifi w/ Neurochrome buffer upgrade, but I may wait to see how this develops.
 
A reach out for some thought:

Would a single Hypex SMPS1200A400 for enough for three Purifi modules?
Purifi answered me saying it "should handle nearly all music/movie usage situations"....
 
Buckeye Amps said:
It may detract some buyers, but the design I am going for is XLR in only. A properly wired RCA to XLR cable will still always be all that is needed for those with RCA.
Click to expand...

A properly wired RCA to XLR cable is not all that is needed if one wants to use the full output capabilities of the 1ET400A when using dual single-channel opamps like the OPA1612. According to the 1ET400A's spec sheet, 11.2Vpk-pk (I'm assuming pk-pk even though the spec sheet doesn't specify pk-pk or RMS as 12Vrms input would be ludicrous) referenced from the negative input is the max voltage needed to reach full rated power. That's 11.2V / 4Vrms (XLR line level) / 0.707 (RMS to pk-pk conversion) = 3.96 times XLR line level. In comparison, the single-ended max recommended voltage rating, according to the spec sheet, is 5V. That's 5V / 2Vrms (RCA line level) / 0.707 = 3.54 times RCA line level. That would mean RCA users would never be able to reach the full power rating. It would be trivial to use a differential opamp like the LME49724 (used in the Schiit Magnius, a highly rated amp) instead of the OP1612 which will allow proper differential output with only a single-ended input.
 
Buckeye Amps said:
A reach out for some thought:

Would a single Hypex SMPS1200A400 for enough for three Purifi modules?
Purifi answered me saying it "should handle nearly all music/movie usage situations"....
Click to expand...
I think most users would accept to bottleneck say from max 450W to 400W theoretical power on each of the 3 modules in order to get significant savings by using a single SMPS1200A400 and small chassis. Would be the cheapest 3 channel Purifi for sure, and still plenty of power. Sounds great to me!
 
Matias said:
I think most users would accept to bottleneck say from max 450W to 400W theoretical power on each of the 3 modules in order to get significant savings by using a single SMPS1200A400 and small chassis. Would be the cheapest 3 channel Purifi for sure, and still plenty of power. Sounds great to me!
Click to expand...
The specs indicate 1500 max power and 1200W at 20Hz - Considering most HT use (3 channel) will include a subwoofer and would never drive all 3 channels to max power simultaneously. While still retaining full power for 2 channel use, I would happy accept the tradeoff for a small and affordable 3 channel Purifi amp
 
Any idea as far as time frame for a purchase?
 
Thanks everyone for the website help offers. I am working on one as we speak.
 
Some more good news:

Because of the approach for this amp, with the custom input board containing nearly everything and wiring being a minimal effort, my hope is that purifi builds would have a lot shorter of a wait time than my Hypex builds.

Purifi customers wouldn't be cutting in line or pushing back the build times of existing Hypex orders but instead be much like a Ghent build where I could slot them in for assembly without affecting timelines.
 
Count me in for one of the stereo versions.
 
Buckeye Amps said:
Initial custom buffer design/pricing is done (very happy about the price). Not at all finalized, but would be using TI TPS7A49/30 voltage regulators, OPA1612, toggle switch for either "Norrmal" or "Low" gain (26dB/20dB range), slide switch for "On" "12v Trigger" "Auto Sense", PCB mounted Neutrik XLR connectors (with correct Pin 1 wiring), FastOns for connecting my own speaker binding posts (so can easily allow speakON option), Power LED....among other things.

The Hypex SMPS1200A400 is out of stock until end of April unfortunately. Would make a prototype hopefully in May to undergo testing (including tests similar to what Amir does to verify the input board performance, etc). So, fingers crossed, POSSIBLY June/July availability. Not going to take pre orders until the prototype is done and verified.

For a 2ch Purifi, I am shooting for a price range around $1129.
Click to expand...

I would be interested in a 3 ch version of this. Just 1 question though:
Would the 26db gain work with an AVR pre-out of 1v? I have an Onkyo TX-RZ50 on order which I am hearing has only 1v pre-outs...
I would be using the pre-outs for the LCR speakers (Sonus Faber Lumina V's that are 4 ohms with 89db sensitivity and a suggested amp output of 50-300w).

Also, any idea on what the 3ch version would price out at?

Thanks
 
DonH56 said:
1ET400A output spec = 425 W into 4 ohms which is 41.23 Vrms or 32.3 dBV so you'd need more than 1 Vrms to drive it to full scale. Onkyo does say on their website that subwoofer/pre outs are 1 V (https://www.onkyousa.com/product/tx-rz50-9-2-channel-thx-certified-av-receiver/).
Click to expand...
Somewhere on the internet, maybe here or maybe AVS, there was speculation that the actual voltage out was higher than 1v but that Onkyo was only promising a minimum of 1V across all pre-out channels. So there might be a higher voltage if you're only sending out the LR channel.

I would like to think they'd include the center in their plans as well but only the LR channels get the nice amplification (according to the manual/box) and I believe there are two kinds of DACs where the LR get a decent one and every other channel get the lesser version; so probably not. We'll know soon enough as the RZ50 review goes up.
 
i want to buy one.
Buckeye Amps said:
Initial custom buffer design/pricing is done (very happy about the price). Not at all finalized, but would be using TI TPS7A49/30 voltage regulators, OPA1612, toggle switch for either "Norrmal" or "Low" gain (26dB/20dB range), slide switch for "On" "12v Trigger" "Auto Sense", PCB mounted Neutrik XLR connectors (with correct Pin 1 wiring), FastOns for connecting my own speaker binding posts (so can easily allow speakON option), Power LED....among other things.

The Hypex SMPS1200A400 is out of stock until end of April unfortunately. Would make a prototype hopefully in May to undergo testing (including tests similar to what Amir does to verify the input board performance, etc). So, fingers crossed, POSSIBLY June/July availability. Not going to take pre orders until the prototype is done and verified.

For a 2ch Purifi, I am shooting for a price range around $1129.
Click to expand...
i want to buy one.
 
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