FirstWatt B3 Preamplifier

[Tolu]

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]

.....
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]

Re: Re: FirstWatt B3 Preamplifier

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]

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

 

[ANADIGIT]

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 ?

 

[Tolu]

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]

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

 

[Skorpio]

Is B3 forgotten?

 

[Nelson Pass]

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.

😎

 

[overtheairbroadcast]

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.

 

[Skorpio]

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.

😎

Very interesting, might be an even better Christmas than expected 🙂 🙂 🙂

 

[Gyuri]

Yes, but we are cannot be sure, in which year...😀😉

 

[Nelson Pass]

Might I ask what you thought was wrong with the first design?

Nobody liked it.

😎

 

[Cobra2]

How cool...that even tha master has to return to the drawing-board/soldering-iron...
-Need to remember; this makes me feel successful when I have to re-design/test/test/test/...

Arne K

 

[Zen Mod]

they didn't like even R1 ?

 

[Nelson Pass]

All the proper ingredients for a great joke were in place, but the audience
didn't laugh.

😎

 

[Zen Mod]

they're already spoiled .

too much

 

[generg]

All the proper ingredients for a great joke were in place, but the audience
didn't laugh.

😎

Let me guess please Nelson, your technical genius won against your ears.....😀😀

 

[PKI]

I guess it also has to be different from a BAF'13 LSK preamp and BA3 FE, so Nelson can put it into a box with the FW logo 🙂

 

[Zen Mod]

it was very different (both R0 and R1 ) , so that is not reason

🙂