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Burning Amp BA-3b (Balanced)
Burning Amp BA-3b (Balanced)
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Old 20th September 2018, 10:33 AM   #591
astromo is offline astromo  Australia
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Originally Posted by meanie View Post
Having built the BA3 as preamp and the latest V1.6 ACA monobloc, currently running in unbalanced bridged mode. Very happy with the sound quality....and enjoying it for the past 2 weeks.

Has anyone tried using the BA3 Balance amp on the ACA V1.6 in XLR mode ?
Will the sound quality have mark improvement as compared to unbalanced BA3 mode ?

Very tempted to build a BA3 Balanced preamp.
I'd be interested too, especially if I could work through a build guide to understand what's involved to make it a reality.

I'm also on the look out for a balanced Aleph J build guide, if one exists?
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Old 21st September 2018, 01:12 AM   #592
6L6 is offline 6L6  United States
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Burning Amp BA-3b (Balanced)
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I'm also on the look out for a balanced Aleph J build guide, if one exists?
The normal Aleph J guide IS the balanced guide, the only difference is you donít jumper the -in to ground on the PCB.
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Old 21st September 2018, 04:40 AM   #593
astromo is offline astromo  Australia
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The normal Aleph J guide IS the balanced guide, the only difference is you donít jumper the -in to ground on the PCB.


Thanks 6L6 - Love your work
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Old 8th October 2018, 08:01 PM   #594
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Hi guys. I am building s BA3 and I have a serious issue. Although the ampl works, the gain board has only a gain of 5x only so when I plug in my phone to the input, I can hardly hear much coming out of the speaker. Any ideas? It's clipping at 44v p2p and the rails are +-40v dc.
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Old 8th October 2018, 08:14 PM   #595
Zen Mod is offline Zen Mod  Serbia
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Burning Amp BA-3b (Balanced)
exact schematic ?
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Old 8th October 2018, 09:21 PM   #596
dodovouk is offline dodovouk
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It's all here. I am doing the zero feedback single ended version.

BA-3 Amplifier illustrated build guide
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Old 8th October 2018, 09:46 PM   #597
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presuming that you didn't made some systematic mistake in resistor values, just increase value of R13 , until you're happy with voltage swing/gain

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Old 9th October 2018, 08:16 AM   #598
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presuming that you didn't made some systematic mistake in resistor values, just increase value of R13 , until you're happy with voltage swing/gain

Click the image to open in full size.
Thanks so much. I will try and report!
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Old 9th October 2018, 06:09 PM   #599
dodovouk is offline dodovouk
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Thanks so much. I will try and report!
I can confirm that by putting a 2K resistor makes the game so much more. Thank you so much.

The other issue I have is that the the other issue i have is that the output port don't seem to be increasing the voltage going in. So the output ports in other words have no gain. There is 80 v DC on the rails but they clip at 40v peak to peak. Any more suggestions?
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Old 9th October 2018, 08:25 PM   #600
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Burning Amp BA-3b (Balanced)
clarify

I can't follow you there

from where are your input JFets (origin , range) , did you have all parts values as per schematic?
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