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Old 6th May 2007, 04:19 AM   #1
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Default LabGruppen, what to do?

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?
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Old 6th May 2007, 04:21 AM   #2
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Backview of power amp modules+input preamp modules. These are 1400W modules.
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Old 6th May 2007, 05:33 AM   #3
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Which Bipolars were used in output stage....David

The manual says FP6400 is 2500+2500WRMS into 2 Ohms
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Old 6th May 2007, 07:25 AM   #4
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I'm curious about the heatsink arrangement. Could you post more detailed pictures?
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Old 6th May 2007, 07:31 AM   #5
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Old 6th May 2007, 09:32 AM   #6
Eva is offline Eva  Spain
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Uhmm...

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

You are evil...
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Old 6th May 2007, 10:23 AM   #7
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Default Re: LabGruppen, what to do?

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.
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Old 6th May 2007, 11:04 AM   #8
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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.....
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Old 6th May 2007, 11:04 AM   #9
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They should add a back plate sticker: don't hit the sinks with a hammer.
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Old 6th May 2007, 11:16 AM   #10
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David
I wouldn't really touch it, especially the switching part.
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