BA-3 As Preamp

[vdi_nenna]

Is it possible to use the BA-3 front-end as a pre-amp? I think I read it can, but can't find the reference.

Has anyone used it as pre-amp and do you have any impressions on the sound? I'm currently using a BOZ-J and would like a bit more drive for a bi-amp setup running the L'amp CCS and a F5.

Thanks,

Vince

Note:

If using Fairchild mosfets, use 1K variable resistors for P1 and P2.

Volume control- 20K to 50K

 

[thor61]

Here is a link to someone who built one as a preamp > http://www.diyaudio.com/forums/pass-labs/196857-between-f4-f5-3.html The details are vague at best !

 

[vdi_nenna]

Thanks. I just saw he used the BOZ-J as well. PM'ed him to get impressions.

Thanks,

Vince

 

[Tiroler]

ZM said that.
Look for post1029 and post 1031here:
www.diyaudio.com/forums/pass-labs/86300-ugs-adventures-103.html

 

[generg]

Is it possible to use the BA-3 front-end as a pre-amp? I think I read it can, but can't find the reference.

Has anyone used it as pre-amp and do you have any impressions on the sound? I'm currently using a BOZ-J and would like a bit more drive for a bi-amp setup running the L'amp CCS and a F5.

Thanks,

Vince

It was the intention of the people starting with the Burning Amp series that the Burning Anp should be used in a modular way means mixing allowed of frontends and outputstages, wasn't it Mark himself mentioning this...

I look for the sources...

I found it....

http://www.diyaudio.com/forums/pass-labs/201281-burning-amp-ba-3b-balanced-34.html#post3175072

 

[vdi_nenna]

I keep seeing mention of the BA-3 as a balanced pre, but the schematic under the board us single-ended.

 

[Zen Mod]

all you need is there : http://www.diyaudio.com/forums/pass-labs/201281-burning-amp-ba-3b-balanced.html#post2739404

along with explanation for "simple" (SE) BA3 FE : http://www.diyaudio.com/forums/diyaudio-com-articles/194809-burning-amplifier-ba-3-a.html

scroll down the page , read my longish comment , where I ( as usually ) made all work ( no money , no glory ) , correcting differences between sch. nomenclature and Pa's explanation

 

[tinitus]

... would like a bit more drive for a bi-amp setup

I suppose you would want to have seperate attenuators for each channel/amp

juma have shown a jboz like input with B1 like output
might work for biamping

or maybe consider active xo

 

[vdi_nenna]

maybe consider active xo

I'm using a 2-way active crossover (MOX II).

juma have shown a jboz like input with B1 like output

I find the JBOZ a bit light. I really like it, but it needs a bit more push.
Sounds to me that the BA-3 pre has that extra push.

I also have a B1 in the house. It's connected to another system.

 

[vdi_nenna]

ZM, on first look, it seem there is'n't much changed between the two halves.
Should be easy to do.

 

[Zen Mod]

it isn't changed , "except" introducing bridge resistor ( each halve serving as virtual gnd to other one)

be sure to have bleeder resistors after output caps ; as drawn , FE is part of amp itself , so they aren't necessary

when stage used/packed standalone , they must be implemented

 

[bnorrish]

Any issues putting a B-1 in front of a BA-3 for a complete preamp with volume control and input selector?

 

[Zen Mod]

B1 ( at least active part - buffer itself ) is redundant in that case

Jfet input is having input impedance dominated by value of resistor from gate to GND , in both cases - B1 and BA3 FE

 

[bnorrish]

OK. Just need a simple board for volume POT and selector and relays for input selection. Any opinion best way to mount these components? Prototype perfboard? Want to keep it neat and pretty.

 

[Zen Mod]

whatever please your eye

 

[6L6]

bnorrish- Relays? That seems complicated. A rotary switch for input selection would be much easier.

 

[bnorrish]

I was going by the Mez B-1 design - I like easy.

 

[Zen Mod]

nothing wrong with rotary selector , governing small Takamisawa relays

 

[bnorrish]

Even a newb like me could probably handle relays.

 

[PKI]

After reading (links ZM posted) I have a question: As ZM told for the FE application you need bigger voltage swing, so like ~30V rail, but people are suggest to power BA-3 from the same PSU they use for F4. Will a separate PSU which give ~30V rail be suitable for either applications of BA-3: FE(for F4) and preamp other FW amp?