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Old 24th January 2012, 11:50 AM   #1001
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Are you suggesting a 10uF cap sounds the same as any other 10uF cap?
What I can say is that my RC network sounds different if I turn it around. Of course it could be a change in contacts due to movement, or my ears of course or my emotions, psychological influences etc. Oh and that of course.
But in the end I must trust my ears over physics.
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Old 24th January 2012, 11:53 AM   #1002
Zen Mod is online now Zen Mod  Serbia
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no , I'm not saying anything about different cap ;

I was just commenting on turning around RC (to become CR)
my Papa is smarter than your Nelson !
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Old 24th January 2012, 06:43 PM   #1003
Itsmee is offline Itsmee  England
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I agree with ZM, but the difference you are hearing might be due to flipping the cap around - signal going to the outer foil rather than the inner foil (or visa versa)
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Old 25th January 2012, 08:26 AM   #1004
AndrewT is offline AndrewT  Scotland
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Originally Posted by Zen Mod View Post
RC chain is R and C series connected - between two nodes ;

it's irrelevant is it RC or CR
a series RC is the same as a series CR.
If you can hear a change, then you are changing something else.
regards Andrew T.
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Old 2nd February 2012, 10:28 AM   #1005
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I am probably reaching the end point of upgrading the BA-2 front end with a voltage regulator. I have used the Salas reg with good results resulting in a reduction in background noise and image clarity and detail. However, the sound of the BA-2 being run from Nelson's power supply was also very good to start with having a warm depth to the soundstage and images alike with plenty of good dynamics so it was going to take a lot to keep this and make improvements. The regulator certainly had gone some way towards this by improving those aspects already mentioned but that warmth and something of the soundstage and musical image depth had been lost. So I have replaced the Panasonic TS-HA 10,000 caps with Mundort 4700uF on the regulator and the overall sound has lost its somewhat flattened perspective in favour of the pre-regulator soundstage depth as well as sound image depth. To my ears the music is now flowing better and the muscial timbres are more natural.
Hope this helps for those wondering about components.
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Old 12th February 2012, 01:39 PM   #1006
biju55 is offline biju55  India
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Default burning amp-2

what is the power out put of BA-2 ?
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Old 13th February 2012, 09:52 AM   #1007
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Originally Posted by biju55 View Post
what is the power out put of BA-2 ?
I don't know and it probably depends on how many power boards per channel are used. All I can say is that using one power board per channel is enough to drive my Dynaudio Contour 1.8MkII loudspeakers at a loud level for me with the pre-amp volume turned half way round.
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Old 13th February 2012, 10:52 AM   #1008
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Originally Posted by biju55 View Post
what is the power out put of BA-2 ?
it's set by your rail voltage, I think the expression is approximately 1/2*(Vrail^2)/Rspeaker

So, 25 V rails, 8 ohm speakers, you get nearly 40 W. It won't be class-A here though, 25 V and class-A through 8 ohm speakers would need 3 A of idle current.
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Old 28th February 2012, 10:21 PM   #1009
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Default BA-2 ground loop issue

I experience a major ground loop issue after inter-connecting the amp input with the pre amp out puts.
When i connect only one of the in amp channels with the pre amp out everything is normal no any hum or any other kind of noise and when i connect the other input as well all hell breaks loose (loud hum and noise altogether).
I am only operating the amp using single-ended (RCA) input and according to BA-2 manual i have shorted the negative input (IN-) to ground on the front end pcb.
Only one ground of the front end is returned to the main star ground.
The front end itself is been supplied by a separate power supply (shunt regulator) with its common (0) been connected to the main star.
From that main star ground i connect to the chassis thru diode bridge and then to AC earth.
Below you can see my pcb wiring connection diagram and some photos .
Please help!!!!!
Attached Images
File Type: jpg PB290885.JPG (147.9 KB, 353 views)
File Type: jpg PB290886.JPG (155.3 KB, 342 views)
File Type: jpg PB290892.JPG (142.8 KB, 341 views)
File Type: jpg PC100941.JPG (136.7 KB, 336 views)
Attached Files
File Type: zip BA-2 WIRING DIAGRAM.zip (88.2 KB, 42 views)
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Old 28th February 2012, 11:59 PM   #1010
JimM is offline JimM  United States
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On my ba2 boards the front end ground's are separate, so if you only have one side of the front end board grounded then the other side is not tied to ground you need to tie both front end grounds to the common ground point. If I understand what you have written i.e. Only one ground of the front end is returned to the main star ground.
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