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Old 23rd October 2008, 11:08 AM   #1
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Default Gainclone and B1 pre-amp

Seems like Nelson's preamp follows the minimalist philosophy.

Do you think it is a good idea to use this with GC ?
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Old 23rd October 2008, 11:14 AM   #2
AndrewT is offline AndrewT  Scotland
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Default Re: Gainclone and B1 pre-amp

Quote:
Originally posted by gainphile
Seems like Nelson's preamp follows the minimalist philosophy.

Do you think it is a good idea to use this with GC ?
no.
Use the pre-amp/buffer to condition the signal coming from the source or from the attenuator.

Once you have a low source impedance, the GC (as you call it) or any power amp will be able to perform well.

The purpose of the pre-amp/buffer is to make the signal better.
It is not intended to make the power amp better.
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Old 25th October 2008, 03:48 PM   #3
juma is offline juma  Serbia
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Default Re: Gainclone and B1 pre-amp

Hi gainphile !

B1 is very easy to build and it's surely worth a try. It is common knowledge that GC (LM3875, LM3886) will benefit sonically from good buffer on its' input.
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Old 25th October 2008, 03:53 PM   #4
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Default Re: Re: Gainclone and B1 pre-amp

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Originally posted by juma
It is common knowledge that GC (LM3875, LM3886) will benefit sonically from good buffer on its' input.
no, that it's not correct either. The GC (as you call it) does not need buffer on it's input. It's the inferior source, or passive attenuator, that needs it.

But certainly, B1 should work well with chip amp.
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Old 25th October 2008, 08:37 PM   #5
juma is offline juma  Serbia
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Default Re: Re: Re: Gainclone and B1 pre-amp

Quote:
Originally posted by Peter Daniel

... passive attenuator that needs it. ...

Yes, that's it, I tend to put the volume pot on GC's input
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Old 26th October 2008, 10:06 AM   #6
AndrewT is offline AndrewT  Scotland
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That's the wrong place.
A source buffer should be located inside the source casing, i.e. inside the CD player, tuner, sound card etc.
An attenuator buffer should be located at the attenuator.
The buffer gives the ability to drive all that comes after it, including the cables and other parasitics.
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