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Old 11th November 2017, 02:20 AM   #2281
First Watt Guy is offline First Watt Guy  Viet Nam
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Default X0 FE for sure

Maybe X0 at the FE as Gerd said but I saw 7815/1915 regulated IC bottom IRF side.
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Old 23rd November 2017, 08:08 PM   #2282
oiphy is offline oiphy  Norway
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Burning Amp BA-3
Default need more power ba3

do i adjust pot 1 ?

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dont know how to put pics here so hopes this gets here.
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Old 23rd November 2017, 09:21 PM   #2283
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Burning Amp BA-3
P1 and P2 are to adjust unison , to set current through Q3 and Q4 , nothing to have with "power"

if you need more power , you need bigger amp - meaning higher PSU rails etc.

do you , by chance , means at needing more gain, not power ?
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Old 23rd November 2017, 10:07 PM   #2284
oiphy is offline oiphy  Norway
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Quote:
Originally Posted by Zen Mod View Post
P1 and P2 are to adjust unison , to set current through Q3 and Q4 , nothing to have with "power"

if you need more power , you need bigger amp - meaning higher PSU rails etc.

do you , by chance , means at needing more gain, not power ?
yes more gain..... and i want the heatsink to run a little hotter
we are talking of the bias board here? pot 2 is dc offset ??? pot 1 bias??
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Old 23rd November 2017, 10:16 PM   #2285
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for more gain , increase R13 at front end pcb

second question - you need to point me to exact schematic of output stage you're using , so I can pinpoint proper pots
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Old 23rd November 2017, 10:29 PM   #2286
oiphy is offline oiphy  Norway
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Quote:
Originally Posted by Zen Mod View Post
for more gain , increase R13 at front end pcb

second question - you need to point me to exact schematic of output stage you're using , so I can pinpoint proper pots

r13 is now 330 ohm ...suggested value to start with... 0 gain preamp
this is build by the first from the shop ...by the book...
i have super bad memory so dont really know

can you see it on pictures?
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Last edited by oiphy; 23rd November 2017 at 10:33 PM.
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Old 23rd November 2017, 10:38 PM   #2287
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sorry , I can't

didn't had these pcbs in hands , so someone else need to chime in
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Old 24th November 2017, 04:22 PM   #2288
6L6 is offline 6L6  United States
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Burning Amp BA-3
Quote:
Originally Posted by oiphy View Post
r13 is now 330 ohm ...suggested value to start with... 0 gain preamp
With 330ohm at R13 gain is about 15, not zero. The driver board has gain in it's standard configuration.


Do you want the amplifier to play louder? Increasing the heat (bias) won't make any change to that.
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Old 24th November 2017, 07:36 PM   #2289
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as I understood - he want's more gain and , as second thing , he want's more Iq

only English is slight problem
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Old 25th November 2017, 11:25 PM   #2290
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Quote:
Originally Posted by 6L6 View Post
With 330ohm at R13 gain is about 15, not zero. The driver board has gain in it's standard configuration.


Do you want the amplifier to play louder? Increasing the heat (bias) won't make any change to that.
Actually I experienced higher gain (or at least higher volume output) when increasing the bias on the BA3 front end. I remember reading Nelson saying that bias and gain are related in the outputs of the FE.
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