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Old 9th November 2012, 03:15 AM   #881
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Wire-wounds ARE COOL !!! ( especially the big ones, with small loads ! ).

Interesting to read Mr. Morgan Jones's comments on WW's of recent...
...very low value one's do have a VERY small inductance...he say's ( a few uH's )...
...ie. like Variac says...the one's people use in PSU's.

Larger one's...according to Morgan Jones...have very little inductance at all...
...ie. over 1/4K or so...series signal-path ones, loads etc.

Heat-cycle on a low oven-temp, with that pizza warm-up...BINGO...stable values, low noise...&...err...PIZZA !

What could be better than that...
...love 'em both.

BBA-3 looks 'tasty' as well !

Cheers

Si.
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Old 22nd November 2012, 04:00 AM   #882
Pocoyo is offline Pocoyo  Indonesia
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Sorry for " OFF TOPIC "
Can someone help me ?

Where i can find the BBA3 PCB like this ?
I need 2 SET " Green " PCB

Please PM or Email me

Best Rgds
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Old 22nd November 2012, 06:00 AM   #883
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official boards are avaliable through the diyAudio store. FE boards here --> P-BAGSN-1V20 - Burning Amplifier Gain Stage for BA-3 (Requires bias boards and output stage; Makes 2 channels; Rev 2.0) - Burning Amplifier Series - Power Amplifiers - PCBs though I am red/green colourblind, I'm pretty sure the boards are red

Tony.
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Old 2nd December 2012, 01:14 AM   #884
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Default Something weird happening with my BA-3

I'm having a curious problem with one channel of my BA-3...
  • When I turn the amp on, the left channel will often appear to be dead.
  • If I turn up the volume (passive unit before the BA-3), the sound will suddenly turn on.
  • If I then turn it back down to a normal level, it continues to play, but it will sometimes just go off again later.
  • The same remedy will bring it back on again.
Any ideas where I should look for problems?

Thanks,
tim
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Old 2nd December 2012, 10:48 AM   #885
AndrewT is offline AndrewT  Scotland
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Probably not the Power Amplifier.
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Old 2nd December 2012, 02:47 PM   #886
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Quote:
Originally Posted by AndrewT View Post
Probably not the Power Amplifier.
I agree. The F4 seems fine. The BA-3 is my preamp gain stage in conjunction with a passive select/attenuator box.

The problem only occurs with the BA-3 in circuit.

Tim
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Old 2nd December 2012, 03:44 PM   #887
Mr. dB is offline Mr. dB  United States
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Quote:
Originally Posted by timbarnes View Post
I'm having a curious problem with one channel of my BA-3...
  • When I turn the amp on, the left channel will often appear to be dead.
  • If I turn up the volume (passive unit before the BA-3), the sound will suddenly turn on.
  • If I then turn it back down to a normal level, it continues to play, but it will sometimes just go off again later.
  • The same remedy will bring it back on again.
Any ideas where I should look for problems?
We ran into this sort of problem in mixing consoles in live sound, it usually ended up being either (1) a cold solder joint, (B) a loose or dirty connector, (III) a capacitor, or (d) a wiper making bad contact in a potentiometer.

Maybe look at the electrolytic caps on that channel of the BA-3 board. Also give the preamp the "slap test", see if physical stimulus affects the problem.
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Old 2nd December 2012, 03:58 PM   #888
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Mr. dB View Post
Also give the preamp the "slap test".....
yeah, give a good slap and tell it to behave

sorry, couldn't resist it ....have a picture been posted ?

Quote:
Originally Posted by timbarnes View Post
[*]If I turn up the volume (passive unit before the BA-3), the sound will suddenly turn on.
ah ! look at your pot then
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Old 3rd December 2012, 12:08 AM   #889
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Quote:
Originally Posted by tinitus View Post
yeah, give a good slap and tell it to behave

sorry, couldn't resist it ....have a picture been posted ?



ah ! look at your pot then
I get the same behavior with two different passive preamps, so I don't think it's the pot. I think it's probably a bad solder joint - the BA-3 is sensitive to being slapped. But I've tried resoldering a couple of times and I can't see any bad joints. Need to try again, I guess.

Today for some reason it's been stable and great to listen to...I guess it's been reading my posts and fears for its life

First picture is of the two units closed; second is the BA-3 and third is its power supply. The BA-3 is configured as a gain stage, following a passive preamp, and preceding my stereo F4.

tim
Attached Images
File Type: jpg BA-3.jpg (271.8 KB, 298 views)
File Type: jpg BA-3 (1).jpg (305.5 KB, 294 views)
File Type: jpg BA-3 (2).jpg (315.3 KB, 286 views)
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Old 3rd December 2012, 01:39 AM   #890
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Once you catch it when it's dead, check the voltages on R3, R4 (~80mV), and R10, R11 (~1V) to see if you have current flowing through those elements. If it's alive but still no sound, maybe a bad RCA connection or something, or a solder joint as you said. An o-scope would be real useful at that point if you had access to one.
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