Sansui AU G33X protector at higher volume

Alfanijs · 18th October 2010, 05:02 PM

Hello,

I have a problem with my Sansui AU-G33X amplifier. It works fine at lower sound levels, but as soon as I crank up the volume the protector circuit kicks in. After the normal blinking the amp starts working again. I tried and it is only related to the right channel. A few months ago I adjusted bias and checked for DC voltage, so all should still be fine.
Of course this unit is from 1983 and I did not yet replace the capacitors.
Any suggestions where to start looking?

Thanks for your advice,
Nijs

Rapidroy · 18th October 2010, 09:42 PM

I would check you speakers and speaker wires, one little stray strand of speaker wire touching from + to - will cause this to happenas soon as a little power is added. Or if your speakers are 4 ohm and when you turn up the music it drops down to less ohm's as the the bass is a kick'n, bam, the speaker protection comes on. I have a Sansui and thats what I found would happen. If you have, or, can try a differance pair of speakers I would do that first before digging in to the amp.

zeonrider · 18th October 2010, 09:54 PM

Quote:

Originally Posted by Alfanijs

Hello,

Check otput impedance eg. speaker impedance!
Regards zeoN_Rider

Alfanijs · 19th October 2010, 08:54 AM

Thanks both of you for your replies. You were spot on Rapidroy - it was a stray strand of speaker wire! DC resistance was 1.4 Ohms... Of course I read your messages too late and I discovered this only after replacing all el. caps in the power amp circuitry. Worst thing is I made the speaker cables myself and they had been running without problems on my B2101 power amp, even at higher volume levels - shows again what a beast this is! So I did not suspect the cables or speakers at all.

Everything is fine now. Thanks again!

18th October 2010, 05:02 PM	#1
Alfanijs diyAudio Member Join Date: Mar 2010	Sansui AU G33X protector at higher volume Hello, I have a problem with my Sansui AU-G33X amplifier. It works fine at lower sound levels, but as soon as I crank up the volume the protector circuit kicks in. After the normal blinking the amp starts working again. I tried and it is only related to the right channel. A few months ago I adjusted bias and checked for DC voltage, so all should still be fine. Of course this unit is from 1983 and I did not yet replace the capacitors. Any suggestions where to start looking? Thanks for your advice, Nijs

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18th October 2010, 09:42 PM	#2
Rapidroy diyAudio Member Join Date: Jan 2008	I would check you speakers and speaker wires, one little stray strand of speaker wire touching from + to - will cause this to happenas soon as a little power is added. Or if your speakers are 4 ohm and when you turn up the music it drops down to less ohm's as the the bass is a kick'n, bam, the speaker protection comes on. I have a Sansui and thats what I found would happen. If you have, or, can try a differance pair of speakers I would do that first before digging in to the amp.

19th October 2010, 08:54 AM	#4
Alfanijs diyAudio Member Join Date: Mar 2010	Thanks both of you for your replies. You were spot on Rapidroy - it was a stray strand of speaker wire! DC resistance was 1.4 Ohms... Of course I read your messages too late and I discovered this only after replacing all el. caps in the power amp circuitry. Worst thing is I made the speaker cables myself and they had been running without problems on my B2101 power amp, even at higher volume levels - shows again what a beast this is! So I did not suspect the cables or speakers at all. Everything is fine now. Thanks again!

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