LabGruppen, what to do?

lumanauw · 6th May 2007, 04:19 AM

A friend bought LabGruppen FP6400 power amp. Brand new, not even 1 day, I was invited to his house, disassemble the amp, and ask me to upgrade the sound.

Anyone has experience to make better sound from this pro-amp? What to do? Changing input differential to Jfet? Change cascodes? Better CCS?

lumanauw · 6th May 2007, 04:21 AM

Backview of power amp modules+input preamp modules. These are 1400W modules.

Workhorse · 6th May 2007, 05:33 AM

Which Bipolars were used in output stage....David

The manual says FP6400 is 2500+2500WRMS into 2 Ohms

Eva · 6th May 2007, 07:25 AM

I'm curious about the heatsink arrangement. Could you post more detailed pictures?

Workhorse · 6th May 2007, 07:31 AM

Eva · 6th May 2007, 09:32 AM

Uhmm...

Nice rail modulating stuf... with SMPS...

You are evil...

peranders · 6th May 2007, 10:23 AM

Quote:

Originally posted by lumanauw
A friend bought LabGruppen FP6400 power amp. Brand new, not even 1 day, I was invited to his house, disassemble the amp, and ask me to upgrade the sound.

Anyone has experience to make better sound from this pro-amp? What to do? Changing input differential to Jfet? Change cascodes? Better CCS?

Personally I feel that a 6400 W amp at home at 10-100 W is not a particular good choice if you want high fidelity. This amp is made for pumping out kW's day in and day out.

Workhorse · 6th May 2007, 11:04 AM

Quote:

Originally posted by Eva
Uhmm...

Nice rail modulating stuf... with SMPS...

You are evil...

Evita, the SMPS is Flyback type but regulated....Switching converter for rails has frequency of 614Khz....dedicated high and low side drivers with floating gate driver supplies...this amp pumps out 4 X 2500WRMS=10000W.....

jacco vermeulen · 6th May 2007, 11:04 AM

They should add a back plate sticker: don't hit the sinks with a hammer.

darkfenriz · 6th May 2007, 11:16 AM

David
I wouldn't really touch it, especially the switching part.

6th May 2007, 07:25 AM	#4
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	I'm curious about the heatsink arrangement. Could you post more detailed pictures? __________________ I use to feel like the small child in The Emperor's New Clothes tale

6th May 2007, 09:32 AM	#6
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Uhmm... Nice rail modulating stuf... with SMPS... You are evil... __________________ I use to feel like the small child in The Emperor's New Clothes tale

6th May 2007, 11:04 AM	#9
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	They should add a back plate sticker: don't hit the sinks with a hammer. __________________ Looks like Sponge Bob has killed another thread.

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6th May 2007, 05:33 AM	#3
Workhorse diyAudio Member Join Date: Dec 2004	Which Bipolars were used in output stage....David The manual says FP6400 is 2500+2500WRMS into 2 Ohms

6th May 2007, 07:31 AM	#5
Workhorse diyAudio Member Join Date: Dec 2004

6th May 2007, 11:16 AM	#10
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	David I wouldn't really touch it, especially the switching part.

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