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JLE TPA3255 Build and Modifications
JLE TPA3255 Build and Modifications
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Old 21st January 2021, 11:26 AM   #71
Brad Pitt is offline Brad Pitt
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Amp is building.
Lester, the TPA board should not connected to the chassis via the screw, isn't it ?
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Old 21st January 2021, 12:47 PM   #72
turion64 is offline turion64  United States
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JLE TPA3255 Build and Modifications
Quote:
Originally Posted by JLesterP View Post
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
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Old 21st January 2021, 01:18 PM   #73
JLesterP is offline JLesterP  Philippines
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Join Date: Sep 2010
Location: Quezon City
JLE TPA3255 Build and Modifications
Quote:
Originally Posted by turion64 View Post
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 View Post
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.
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Old 21st January 2021, 01:28 PM   #74
turion64 is offline turion64  United States
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Join Date: Mar 2019
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JLE TPA3255 Build and Modifications
Quote:
Originally Posted by JLesterP View Post
Yes, correct. If you want to, you can short RI1 to RI4, it will have sonic benefits.
Something to try today..

Thanks Lester.
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Old 21st January 2021, 08:08 PM   #75
Brad Pitt is offline Brad Pitt
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You will soon have nothing to try , expect a really new architecture ... like a real diff input stage
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Old 21st January 2021, 08:10 PM   #76
Brad Pitt is offline Brad Pitt
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Last end tests and the amp will go to the living room hope will put my last amp to the bin !
Click the image to open in full size.
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Old 21st January 2021, 08:15 PM   #77
turion64 is offline turion64  United States
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Join Date: Mar 2019
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JLE TPA3255 Build and Modifications
Quote:
Originally Posted by Brad Pitt View Post
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
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Old 22nd January 2021, 04:49 AM   #78
JLesterP is offline JLesterP  Philippines
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Join Date: Sep 2010
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JLE TPA3255 Build and Modifications
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
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Old 22nd January 2021, 07:29 AM   #79
Brad Pitt is offline Brad Pitt
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My SMPS outputs 48v
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Old 22nd January 2021, 08:33 AM   #80
daniboun is offline daniboun  France
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Seems great )
I see you are using H2000 case. You should twist all your cables.

Nice anyway )
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