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Old 7th December 2018, 06:38 AM   #1621
MEPER is offline MEPER  Denmark
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Join Date: Nov 2017
Location: Copenhagen
BA-3 pre is also the preamp I will use for MoFo. I am working at the PSU in the moment and have all the parts for BA-3 pre…….apart from the attenuator.
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Old 7th December 2018, 12:12 PM   #1622
jostwid is offline jostwid  Switzerland
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Join Date: Nov 2009
Location: Geneva
Quote:
Originally Posted by noviygera View Post
What will I need to drive the MoFo properly?
you will have to answer two questions to yourself:

"How many volts input into Mofo do i need to get the listening volume i like out of my speakers"

"What kind of distortion would i like to add to the Mofo sound (which is rather neutral..)"

Myself i use the following 4
BA3
LuminAria

NuHybrid (Korg triode with buffer by Pete Millet) in two versions:
without step-up transformer (for high efficiency speakers and low volume)
with step-up transformer
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Old 8th December 2018, 11:29 AM   #1623
prazza1 is offline prazza1  France
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If the preamp has not enough gain, what do you think about connecting an input transformer of 1:4 for instance. What about driving the Mosfet and the frequency response?
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Old 8th December 2018, 12:06 PM   #1624
MEPER is offline MEPER  Denmark
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Join Date: Nov 2017
Location: Copenhagen
I am building the BA-3 pre because it has a lot of gain. It is made for power amps that has no voltage gain. In the moment I use a preamp which has max. 10 dB of gain. This is fine for MoFo with 94 dB speakers. It is only low level recordings where I am close to the 10 dB the preamp can deliver. If I want to play very loud I may need a bit more than 10 dB but I also build BA-3 because of other qualities…..
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Old 8th December 2018, 03:32 PM   #1625
prazza1 is offline prazza1  France
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I would like to use it in biamp in high frequencies since around 300 Hz to up. Maybe I can reduce the value of the choke from 50 mH to what ?
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Old 9th December 2018, 12:04 AM   #1626
MEPER is offline MEPER  Denmark
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Join Date: Nov 2017
Location: Copenhagen
This issue has been discussed a lot in this thread…...but can't remember the post numbers. I think the purpose was the same......as far as I remember MR also made some experiments with smaller chokes…...maybe he remember where to look back in this thread.
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