3e amp

camrector

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Hello all
Just wanted to show off some amps I finished up building.
These use the 3e class d stereo modules with PFFB 2x260@4ohms.
They sound fantastic. Clear, precise, neutral. These are not fatiguing at all. Very class A/B sounding.
So far I’ve built a two channel for a friend and a 4 channel for myself that powers the mids and highs of my active 3way system.
All in cost was roughly $400 for the stereo build and $1000 for the 4 channel. (I splurged on power supply’s and extra caps)
Highly highly recommend this build.
 

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Sonnie

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Wow... so not only did you build your own speakers, you built your amps too. Nice work!
 

camrector

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Main Amp
Hypex NCx500
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3e 260-2-29A x2
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Yamaha AS 2200
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Focus Fidelity/Hqplayer/Roon
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Gustard A26 &DIY Ian Canada
Front Speakers
DIY CSS active 3way
Other Equipment
Gustard P26, Sublime Acoustics crossover, TeraDak OCXO FMC
Wow... so not only did you build your own speakers, you built your amps too. Nice work!
And in the process of building a Dac/Streamer too.
 

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Tim Hector

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Living room: Marantz SR19 Receiver / SLS Q line mtm fronts, polk center channel, JBL Subwoofer
I have built several class D amps. Is this the TPA3255 module? Also have you been able to compare the sound with Post Feedback on vs off? I've heard that there are mixed reactions to the PFFB circuit. Overall the TPA3255;s that I have built have been very nice sounding amplifiers. How does this sound?
 

camrector

Moderator
Staff member
Thread Starter
Joined
Jan 2, 2023
Messages
12
More  
Main Amp
Hypex NCx500
Additional Amp
3e 260-2-29A x2
Other Amp
Yamaha AS 2200
Computer Audio
Focus Fidelity/Hqplayer/Roon
DAC
Gustard A26 &DIY Ian Canada
Front Speakers
DIY CSS active 3way
Other Equipment
Gustard P26, Sublime Acoustics crossover, TeraDak OCXO FMC
I have built several class D amps. Is this the TPA3255 module? Also have you been able to compare the sound with Post Feedback on vs off? I've heard that there are mixed reactions to the PFFB circuit. Overall the TPA3255;s that I have built have been very nice sounding amplifiers. How does this sound?
Yes it is the TPA3255. I did not compare it with PFFB off. That’s why I wanted this module in the first place, so there was no odd frequency dependent behavior.
This amp is in another league compared to other 3255 amps (think Purifi)
Doesn’t sound like class D at all.
 

Tim Hector

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Messages
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Location
St. Charles Missouri
More  
Preamp, Processor or Receiver
SST Ambrosia and Accuphase Clone
Main Amp
Sumo Nine (Rebuilt with outstanding parts)
Additional Amp
SST AMBROSIA Preamp
Other Amp
DIY Jeff Rowland 535.... found original boards
Computer Audio
Dedicated laptop optimized for music
DAC
Denafrips Enyo
Front Speakers
DIY - 2 Channel
Subwoofers
Velodyne (when used), Klipsch
Other Speakers or Equipment
DIY
Streaming Subscriptions
DIY DAC, ES9018, ES9038Q2M, AD1862 all Comp Audio
Satellite System
Living room: Marantz SR19 Receiver / SLS Q line mtm fronts, polk center channel, JBL Subwoofer
I recently did my 3rd TPA3255. I did one of the early 3e that was fully balanced, I then did a cheap board and replaced/upgraded the filter caps. I just did another cheap board.... Found some fairly small 10uf cbb caps, replaced the input caps with those, turned the board over and bypassed all other electrolytic on the board, put a good switching supply on it and added 54,000 uf between the supply and power input. Switched out the 5532 opamps, I'm trying OPa1656 and LME 49860. This amplifier sounds excellent.
 

camrector

Moderator
Staff member
Thread Starter
Joined
Jan 2, 2023
Messages
12
More  
Main Amp
Hypex NCx500
Additional Amp
3e 260-2-29A x2
Other Amp
Yamaha AS 2200
Computer Audio
Focus Fidelity/Hqplayer/Roon
DAC
Gustard A26 &DIY Ian Canada
Front Speakers
DIY CSS active 3way
Other Equipment
Gustard P26, Sublime Acoustics crossover, TeraDak OCXO FMC
I swapped in OPA1656 on an Aiyima
A07 sometime ago and it was a huge improvement. Great opamp for sure!

I’m blown away with how good these 3e sound.
I’m waiting for them to restock the mono boards so I can try a dual mono set up.
 
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