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Old 25th March 2009, 04:50 PM   #1
Tolu is offline Tolu  Germany
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Default FirstWatt B3 Preamplifier

5/24/08

Coming Soon:

The B1 Buffer Preamp will be available in a matter of weeks. It is configured as a “passive” selector and volume control, but with a no-feedback JFET buffer that offers ultra low distortion and noise with ultra wide bandwidth. If passive preamps have not floated your boat in the past, you need to check this one out; it resolves several interface issues that have limited the popularity of passives.

The B2 Biamp Buffer. You say you tried bi-amping but didn’t get sound you wanted? The B2 uses two pairs of the buffers found in the B1 but configured for splitting the output of the preamp with variable relative gain to two sets of power amplifiers. This allows not only isolated amplifier impedance buffering, but adjusts the gain levels for different amplifiers. Even for identical amplifier channels it also allows the subtle adjustment required to get exactly the top/bottom balance you need.

B3 Preamp. Maybe you’d like a B1 but you need some gain.

How long is soon?
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Old 25th March 2009, 05:23 PM   #2
Zen Mod is offline Zen Mod  Serbia
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Default Re: FirstWatt B3 Preamplifier

Quote:
Originally posted by Tolu
.....
How long is soon?

just combine JFet BOZ with B1 ( or even B2)

or make Jfet SL10

or JFet LTP with B1 ........ or B2 ...........

or Papa's JFet discrete OP


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Old 25th March 2009, 06:03 PM   #3
Magura is offline Magura  Denmark
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Default Re: Re: FirstWatt B3 Preamplifier

Quote:
Originally posted by Zen Mod



just combine JFet BOZ with B1 ( or even B2)

or make Jfet SL10

or JFet LTP with B1 ........ or B2 ...........

or Papa's JFet discrete OP



Sure, but will such drive an F4?


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Old 31st March 2009, 08:08 AM   #4
Tolu is offline Tolu  Germany
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I think Nelson has something more elaborated up in his sleeve.
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Old 31st March 2009, 08:58 AM   #5
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Default B3

I have got a schematic of (though) B3 is buffer stage of PASS X0.2 (2SK170 in parallel mode sich as ONO MC stage) with dramatic attenuator.

Does it correct PAPA ?
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Old 27th April 2009, 03:45 PM   #6
Tolu is offline Tolu  Germany
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Zen Mod posted a link of the sale version of the B3 from Reno-Hifi. So, it lives!

@Nelson Pass:
Can we see the schematics, please? Just a short look?
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Old 27th April 2009, 06:39 PM   #7
DaveM is offline DaveM  United States
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A j-BOSOZ will indeed power an F-4. Quite nicely I might add.
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Old 6th November 2013, 10:36 AM   #8
Skorpio is offline Skorpio  Denmark
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Is B3 forgotten?
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Old 7th November 2013, 10:07 PM   #9
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I was not happy with the original, and have finally gotten around to a re-design.
I expect to have it out in a couple months.

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Old 7th November 2013, 10:39 PM   #10
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Quote:
Originally Posted by Nelson Pass View Post
I was not happy with the original, and have finally gotten around to a re-design.
I expect to have it out in a couple months.

This is very, very, very good news!

Might I ask what you thought was wrong with the first design? Just trying to learn a little.
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