JLE TPA3255 Build and Modifications - Page 8

Brad Pitt · 21st January 2021, 11:26 AM

Amp is building.
Lester, the TPA board should not connected to the chassis via the screw, isn't it ?

turion64 · 21st January 2021, 12:47 PM

Quote:

Originally Posted by JLesterP

Hi Pete,

I already tried to remove the R1-R4 and C5-C8 (RC filter) replaced it with a short, then 10pF C0G on opamp feedback caps.

Still the best sounding is no cap on feedback. RC filter (R1-R4 and C5-C8) does not have an impact on sound.

Maybe the opamp socket in my module is already loose and capacitative, so no need for opamp feedback caps lol.

Regards,
Lester

So, just to understand what you just said Lester, CA3, CA6, CB3 and CB6 are removed (for best sound) but altering R1-R4 & C5-C8 doesn’t really add any sonic benefits so just leave them be on my V1 board?

Loose sockets will get you in trouble all the time...

Thanks,

Pete

JLesterP · 21st January 2021, 01:18 PM

Quote:

Originally Posted by turion64

So, just to understand what you just said Lester, CA3, CA6, CB3 and CB6 are removed (for best sound) but altering R1-R4 & C5-C8 doesn’t really add any sonic benefits so just leave them be on my V1 board?

Loose sockets will get you in trouble all the time...

Thanks,

Pete

Yes, correct. If you want to go full non-PFFB, you can short RA7, RA8, RI1 to RI4, it will have sonic benefits.

Quote:

Originally Posted by Brad Pitt

Amp is building.
Lester, the TPA board should not connected to the chassis via the screw, isn't it ?

You can connect the heatsink screw to the chassis. The whole amp module is floating, there's no connection from ground to standoffs.

turion64 · 21st January 2021, 01:28 PM

Quote:

Originally Posted by JLesterP

Yes, correct. If you want to, you can short RI1 to RI4, it will have sonic benefits.

Something to try today..

Thanks Lester.

Brad Pitt · 21st January 2021, 08:08 PM

You will soon have nothing to try

, expect a really new architecture ... like a real diff input stage

Brad Pitt · 21st January 2021, 08:10 PM

Last end tests and the amp will go to the living room hope will put my last amp to the bin !

turion64 · 21st January 2021, 08:15 PM

Quote:

Originally Posted by Brad Pitt

You will soon have nothing to try

, expect a really new architecture ... like a real diff input stage

BradP... I will be waiting for that.. I've used enough chip-quik & de-soldering wick on Ver 1

Pete

JLesterP · 22nd January 2021, 04:49 AM

Hi BradP, you need to change the PFFB network values if you will use it for 38V.

The PFFB for 51V will still work but the sound will be inferior compared to PFFB values for 36V.

Nice aluminum chassis!

Regards,
Lester

Brad Pitt · 22nd January 2021, 07:29 AM

My SMPS outputs 48v

daniboun · 22nd January 2021, 08:33 AM

Seems great )
I see you are using H2000 case. You should twist all your cables.

Nice anyway )

22nd January 2021, 04:49 AM	#78
JLesterP diyAudio Member Join Date: Sep 2010 Location: Quezon City	Hi BradP, you need to change the PFFB network values if you will use it for 38V. The PFFB for 51V will still work but the sound will be inferior compared to PFFB values for 36V. Nice aluminum chassis! Regards, Lester __________________ Visit my official online shop at www.jlelectronicsph.com

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21st January 2021, 11:26 AM	#71
Brad Pitt diyAudio Member Join Date: Dec 2020	Amp is building. Lester, the TPA board should not connected to the chassis via the screw, isn't it ?

21st January 2021, 08:08 PM	#75
Brad Pitt diyAudio Member Join Date: Dec 2020	You will soon have nothing to try , expect a really new architecture ... like a real diff input stage

21st January 2021, 08:10 PM	#76
Brad Pitt diyAudio Member Join Date: Dec 2020	Last end tests and the amp will go to the living room hope will put my last amp to the bin !

22nd January 2021, 07:29 AM	#79
Brad Pitt diyAudio Member Join Date: Dec 2020	My SMPS outputs 48v

22nd January 2021, 08:33 AM	#80
daniboun diyAudio Member Join Date: Nov 2019 Location: Lyon (France)	Seems great ) I see you are using H2000 case. You should twist all your cables. Nice anyway )