FirstWatt B3 Preamplifier

Tolu · 25th March 2009, 04:50 PM

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?

Zen Mod · 25th March 2009, 05:23 PM

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

Magura · 25th March 2009, 06:03 PM

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?

Magura

Tolu · 31st March 2009, 08:08 AM

I think Nelson has something more elaborated up in his sleeve.

ANADIGIT · 31st March 2009, 08:58 AM

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 ?

Tolu · 27th April 2009, 03:45 PM

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?

DaveM · 27th April 2009, 06:39 PM

A j-BOSOZ will indeed power an F-4. Quite nicely I might add.

25th March 2009, 04:50 PM	#1
Tolu diyAudio Member Join Date: Mar 2007	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?

31st March 2009, 08:58 AM	#5
ANADIGIT diyAudio Member Join Date: Nov 2008	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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31st March 2009, 08:08 AM	#4
Tolu diyAudio Member Join Date: Mar 2007	I think Nelson has something more elaborated up in his sleeve.

27th April 2009, 03:45 PM	#6
Tolu diyAudio Member Join Date: Mar 2007	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?

27th April 2009, 06:39 PM	#7
DaveM diyAudio Member Join Date: Feb 2003 Location: Vermont	A j-BOSOZ will indeed power an F-4. Quite nicely I might add.