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Old 18th October 2015, 08:30 AM   #1
prtk is offline prtk  India
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Default stranger 500 watt circuit

i have a same strnger circuit for 500 watt and i am getting very high noise at 70 percent of volume neither above it nor below it. can anyone suggest me solution
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Old 18th October 2015, 08:39 AM   #2
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Schematic with your voltages?
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Old 18th October 2015, 12:08 PM   #3
prtk is offline prtk  India
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it has uses 5200 toshiba 12 no.
please suggest me solution
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Old 18th October 2015, 12:20 PM   #4
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Stranger amplifier is a pa amp bad design with 10% distortion
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Old 18th October 2015, 12:22 PM   #5
prtk is offline prtk  India
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Then please suggest me some good good amplifier design
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Old 18th October 2015, 12:55 PM   #6
JMFahey is online now JMFahey  Argentina
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Quote:
Originally Posted by prtk View Post
i have a same strnger circuit for 500 watt and i am getting very high noise at 70 percent of volume neither above it nor below it. can anyone suggest me solution
What kind of noise?
Hum/Buzz/Feedback/Scratch/motorboating/ticking/?
Post a sound sample or YT video showing it and what you do to make it appear.

As of:
Quote:
Stranger amplifier is a pa amp bad design with 10% distortion
..... really? ..... these guys are geniuses !!!!!!!! what do they do to always have 10% distortion?
Not 9% , not 11% but 10% all the time.

That said: Stranger are successful makers and exporters of PA amplifiers, complete with transformer outputs 2/4 ohms, plus 70V and 100V line, with a matching design. (similar to Ahuja) .
You suggest he strips the amp and builds an audiophool approved one inside?
One of those who claim 0.000000000724% distortion?

Simulated of course, never actually built and even if, no way to measure such low levels, just cutting and pasting what the simulation software claims.

Back to the OP, if it makes some strange noise only at an exact position of the volume pot and nowhere else, then it's probably a dirty/cracked/chipped pot track inside, and probably cleaning won't solve it, just replace the pot with a new one.
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Old 18th October 2015, 01:08 PM   #7
prtk is offline prtk  India
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it is a scratching noise and very loud.
i have two samples and it is same in both.
just increse the master volume to 70 percent and it goes high

Last edited by prtk; 18th October 2015 at 01:10 PM.
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Old 21st October 2015, 03:17 PM   #8
JMFahey is online now JMFahey  Argentina
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1) does it make that noise with no music input?
2) have you tried cleaning those pots?
3) it's weird that two different amps make noise in the exact same volume pot position, but 70% is a reasonable point for the two internal tracks superposition, it might be a defetive pot batch with a problem in that area (fwiw I have manufactured potentiometers and that was one possible problem) , so worst case replace both with known, good quality ones.
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