Burning Amp BA-3 - Page 75

flg · 23rd April 2012, 07:10 PM

Remember, I'm not the one who spec'd 25V for C1 & C2. I'm just wondering where everyone else was, including N.P. with this. I would not really expect to see more than 6V on the 100 and the pot||cap together. You need about 1V on the source R, 2Volts Vgs add some signal and mabe thats 2 more volts, and a little more for when the drive gets tough. But it's a pre. So a 6.3V might work but I'm not goin there. A 10V at min and I think thats doable. My 16V caps are 12.5mm and they fit but my 25V caps are all 18mm!

Backbones · 27th April 2012, 07:16 PM

I used the 1000uF, 25V Silmic II and you are quite right, they don't fit. Doesn't look good but they sound just fine.
I had the same problem with the Silmics on the BA-2 board.
I'm getting used to my boards looking like Stone Henge.

ra7 · 28th May 2012, 04:11 PM

Hey guys, I'm at a point where I need more gain in my system, especially for the digital front end. So, I'm thinking of adding the BA-3 at the output of the DCB1 (the current pre). My question is, can the BA-3 be used this way? From what I can tell, its output impedance is about 300 ohms and should be fine as a standalone preamp into amps other than the BA series.

Zen Mod · 28th May 2012, 04:12 PM

standalone , yeah

that means DCB1 will be redundant

ra7 · 28th May 2012, 04:19 PM

Yeah, but I'm thinking of just stuffing it in the same chassis... you know how much work a new chassis is.

I think I'll keep the DCB1.. it allows many inputs and does a good job of buffering the sources... Planning to put a switch to flip the BA-3 in and out of the system. I really don't need the gain for the analogue source (Pearl II).

buzzforb · 28th May 2012, 04:20 PM

Beyond its output impedance, it has su stantoal drive current, having no problem driving the BA output with an input Z of about 7500, if I remener correctly.

Melon Head · 28th May 2012, 04:23 PM

What would be cool, is if Salas came up with a hot rodded BA3 front end with one of his power supplies.
Then put the output stage in separate case with its own supply (eg CRC).

buzzforb · 28th May 2012, 04:27 PM

BA3 is my current favorite amp. Some diodes in the output seem a novel concept.

Melon Head · 28th May 2012, 04:31 PM

Yeah baby
Try also upping the bias current on 2sk2013/j313

buzzforb · 28th May 2012, 05:07 PM

Already have

23rd April 2012, 07:10 PM	#741
flg diyAudio Member Join Date: Jul 2005 Location: North East	Remember, I'm not the one who spec'd 25V for C1 & C2. I'm just wondering where everyone else was, including N.P. with this. I would not really expect to see more than 6V on the 100 and the pot\|\|cap together. You need about 1V on the source R, 2Volts Vgs add some signal and mabe thats 2 more volts, and a little more for when the drive gets tough. But it's a pre. So a 6.3V might work but I'm not goin there. A 10V at min and I think thats doable. My 16V caps are 12.5mm and they fit but my 25V caps are all 18mm! __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

28th May 2012, 04:12 PM	#744
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	standalone , yeah that means DCB1 will be redundant __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

28th May 2012, 04:20 PM	#746
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Beyond its output impedance, it has su stantoal drive current, having no problem driving the BA output with an input Z of about 7500, if I remener correctly. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

28th May 2012, 04:27 PM	#748
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	BA3 is my current favorite amp. Some diodes in the output seem a novel concept. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

28th May 2012, 05:07 PM	#750
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Already have __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!


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27th April 2012, 07:16 PM	#742
Backbones diyAudio Member Join Date: Sep 2008	I used the 1000uF, 25V Silmic II and you are quite right, they don't fit. Doesn't look good but they sound just fine. I had the same problem with the Silmics on the BA-2 board. I'm getting used to my boards looking like Stone Henge.

28th May 2012, 04:11 PM	#743
ra7 diyAudio Member Join Date: Feb 2009 Blog Entries: 1	Hey guys, I'm at a point where I need more gain in my system, especially for the digital front end. So, I'm thinking of adding the BA-3 at the output of the DCB1 (the current pre). My question is, can the BA-3 be used this way? From what I can tell, its output impedance is about 300 ohms and should be fine as a standalone preamp into amps other than the BA series.

28th May 2012, 04:19 PM	#745
ra7 diyAudio Member Join Date: Feb 2009 Blog Entries: 1	Yeah, but I'm thinking of just stuffing it in the same chassis... you know how much work a new chassis is. I think I'll keep the DCB1.. it allows many inputs and does a good job of buffering the sources... Planning to put a switch to flip the BA-3 in and out of the system. I really don't need the gain for the analogue source (Pearl II).

28th May 2012, 04:23 PM	#747
Melon Head Banned Join Date: Nov 2006	What would be cool, is if Salas came up with a hot rodded BA3 front end with one of his power supplies. Then put the output stage in separate case with its own supply (eg CRC).

28th May 2012, 04:31 PM	#749
Melon Head Banned Join Date: Nov 2006	Yeah baby Try also upping the bias current on 2sk2013/j313

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