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Burning Amp BA-3b (Balanced)
Burning Amp BA-3b (Balanced)
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Old 10th October 2018, 03:59 PM   #621
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Burning Amp BA-3b (Balanced)
you got me there,

was too fast
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Old 10th October 2018, 05:08 PM   #622
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Not so fast. 10Vpp or less is more likely since 28V is at the gate of cascode transistor and 20-30V drop across drain load resistor from 30ma bias.
I am getting 44v p2p now with the standard Burning Amp 3 gain board and rail of 48v dc, why do you say I will only get 10v ?
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Old 10th October 2018, 07:24 PM   #623
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Please calculate operating points or do simulation to understand. The circuit has to be modified to meet output level and gain that you need, but then it may have high distortion. I do not see a good solution coming from that scheme for you.
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Old 10th October 2018, 08:35 PM   #624
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Please calculate operating points or do simulation to understand. The circuit has to be modified to meet output level and gain that you need, but then it may have high distortion. I do not see a good solution coming from that scheme for you.
I proposing to put a more powerful gain/pre amp with 60v gain
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Old 14th October 2018, 09:39 AM   #625
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There are ImPasse Preamplifier with ImPasse Preamplifier thread by SY and Pumpkin preamp - More Boring Making Thread by ZM that may suit your need better.
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Old 14th October 2018, 11:08 AM   #626
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hi, I was completing the assembly of the components on the pcb of the Burning Amp BA-3 as a guide 6L6, now, I saw this thread on the balanced version, coreggetemi if I'm wrong, in case I wanted to build the version b changes to remove the resistors R5 from 100 Ohm on both channels of the BA-3 board and join them with a 200 ohm resistor? connect the positive input to a channel, the negative to the other channel, mass in common? and at the output of the 2 pcb of power one the positive speaker and the other the negative speakers? quite right ?
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Old 14th October 2018, 11:10 AM   #627
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picture is confirming your questions ......

shorter - yes

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Old 14th October 2018, 11:17 AM   #628
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well, one last question; I already have a 1000w 2x18v transformer, but it will not be enough to feed both channels, right?
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Old 14th October 2018, 11:26 AM   #629
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Burning Amp BA-3b (Balanced)
it depends - how deep you want to set Iq

with 18Vac secondaries , count on 22-23Vdc after rectification and filtering ...... say that you choose 150W of heat per (balanced) channel ..... that's 300W of heat for stereo

1KW will suffice , if Donut is not ringing and buzzing

so , try it

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Old 14th October 2018, 11:38 AM   #630
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it depends - how deep you want to set Iq

with 18Vac secondaries , count on 22-23Vdc after rectification and filtering ...... say that you choose 150W of heat per (balanced) channel ..... that's 300W of heat for stereo

1KW will suffice , if Donut is not ringing and buzzing

so , try it

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