3e Audio A7 - TPA3255 Stereo Amplifier Advanced PFFB -First Look

[3eaudio]

The overall design of the case looks good. The front button and rear connectors look good and are well placed.

The heat dissipation still seems problematic:

• When these TPA325x chips get hot, they start to degrade in performance, output power, and lifetime. A big part of the success of the 3e audio 260-2-29A PFFB module design was the huge aluminum heat sink under the board.
• Using the amplifier box to achieve the same effect can work, but care must be taken to provide a reliable interface between the chips and the box.
• A strip of U-bent aluminum between the chips and the box and a few dabs of thermal grease won't do the trick.

I'd like to see a preliminary reading with an infrared thermometer pointed at the TPA325x chips and the top and bottom plates of this case. If the case does not get hot, it is not a good heatsink.

someone will test it soon i believe,we put bigger heatsink, more air slot on both side and also bottom side, our evaluation is better then other brand(PA7 Plus and V3mono)

 

[Defo]

Was signal sense scrapped in favor of 12v trigger?

 

[Guddu]

Was signal sense scrapped in favor of 12v trigger?

I think it’s other way around.

 

[Defo]

I think it’s other way around.

Well, it clearly has a 12v trigger

 

[harkpabst]

Well, it clearly has a 12v trigger

Yes, and it's a pre-production sample, as has been mentioned before.

@3eaudio explicitly confirmed that the trigger input has bee dropped for the regular mass production units in their own thread:

3e Audio TPA3251 TPA3255 Finished Amplifier with PFFB is coming!

I didn't argue against a trigger input. :) Auto-on would be just as good for me, but trigger is fine, too. PS: Yes, adding a trigger input and letting go of volume control would be my preferred choice, too, but it's all up to 3eaudio. The user manual PDF (linked at 3e site) shows a signal sense...

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