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Old 28th March 2011, 08:31 AM   #1411
viki_v2 is offline viki_v2  India
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Quote:
Originally Posted by viki_v2 View Post
Check the pics and guide.
The sound is very low and distorted.
The resistor 0r22/5w in front of 2sa1943 on psu board got burnt .
My psu 24-0-24 before rectification, after rectification 37-0-37.
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Old 28th March 2011, 08:36 AM   #1412
viki_v2 is offline viki_v2  India
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Originally Posted by irvynejay View Post
I can't see input ground to PSU did you follow this?
Yes i followed the diagram. connected the psu gnd , input gnd and out gnd at a common point on gnd next to out
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Old 28th March 2011, 09:54 AM   #1413
viki_v2 is offline viki_v2  India
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voltage on negative terminal drops to 20v, after connection to b500.
positive voltage is proper at 37v.
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Last edited by viki_v2; 28th March 2011 at 10:11 AM.
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Old 28th March 2011, 10:24 AM   #1414
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Old 29th March 2011, 11:33 AM   #1415
mihailo is offline mihailo  Serbia
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Hi Apex. i have a problem with your amplifier.
It all looks ok when connect him, and play song. But when volume reachs half, speaker starts broming(brrrrrrrr) very loudly. I turn off amplifier, reduce volume and and turn again on, and all looks again ok. Where is the problem? Please help me!!!!!!!
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Old 29th March 2011, 11:36 AM   #1416
AndrewT is offline AndrewT  Scotland
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could it be Low Frequency instability of the PSU to amplifier interaction? Used to be known as "motorboating" in valve amplifiers, because that is what it sounded like.
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Old 29th March 2011, 12:13 PM   #1417
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Quote:
Originally Posted by viki_v2 View Post
voltage on negative terminal drops to 20v, after connection to b500.
positive voltage is proper at 37v.
did you test MJE340/350 and 2n5551,5401 unmount it on the pcb then test it with multimeter
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Old 29th March 2011, 02:15 PM   #1418
viki_v2 is offline viki_v2  India
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I tested them, seem to be ok.
I changed 5401 near -90v . The problem of voltage drop is solved. Equal voltages on both terminals.
Psu is also stable and fine no burning , no heating of any parts.
Still no sound.
No current on out.
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Old 29th March 2011, 02:19 PM   #1419
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U use 33E or E33 for emitter?
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Old 29th March 2011, 02:32 PM   #1420
AndrewT is offline AndrewT  Scotland
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Originally Posted by aman khalsa View Post
U use 33E or E33 for emitter?
I think you mean 33E = 33r = 33ohm resistor.
If that is the case, then E33=0r33 = zero point three three ohm resistor.

Do not drop the leading zero. It is important to accurate transfer of information.
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