AudioControl 24XS

Deadly Sones · 25th August 2011, 08:14 PM

Hi!

I have an OS audiocontrol xover... actually 2 EQT's and 2 - 24XS's. One of the low pass channels on the second 24XS which is my midbass channel is cutting in and out... I also noticed that when its cut out if I turn it up the speaker will sort of pulse out and back in slowly. Not constant just every now and then...

Any idea what could cause this to happen? I've looked it over and resoldered a couple connections that didn't look right but no luck.... everything else looks fine. I've tested everything else in the system its definitely the lowpass right ch. Anyone had a similar problem I can check for? Checked ALL the diodes and most of the resistors on that channel and they all appear fine...

I've attached some pics to help... hopefully... lol

Thanks in advance,
Paul

1moreamp · 25th August 2011, 10:11 PM

Check the RC4136 quad op-amps for the defective channel. I have had to replace a few in my past, so it's not too far of a stretch to figure you may have a defective one. Also check the pots for that channel as they do wear out with age and use. Other then that there isn't too much else that can go wrong with any Audio Control device of this era, except the power supply and since yours is working otherwise I rule out any issues there out for now...hope this helps

Deadly Sones · 25th August 2011, 10:20 PM

Will do and update, thanks!

JLH · 25th August 2011, 10:51 PM

Also on the list of things to check are the electrolytic signal caps. I've seen leaky caps cause some strange fading in and out before.

Deadly Sones · 25th August 2011, 11:54 PM

Caps all appeared fine but I will go over them again. Thanks.

25th August 2011, 10:51 PM	#4
JLH diyAudio Member Join Date: Apr 2005 Location: Indianapolis, IN	Also on the list of things to check are the electrolytic signal caps. I've seen leaky caps cause some strange fading in and out before. __________________ Ah, how beautifully the orchestra sounds before a rain! In a dry sunny day there is no way for the instruments to sound this way!

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25th August 2011, 10:11 PM	#2
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	Check the RC4136 quad op-amps for the defective channel. I have had to replace a few in my past, so it's not too far of a stretch to figure you may have a defective one. Also check the pots for that channel as they do wear out with age and use. Other then that there isn't too much else that can go wrong with any Audio Control device of this era, except the power supply and since yours is working otherwise I rule out any issues there out for now...hope this helps

25th August 2011, 10:20 PM	#3
Deadly Sones diyAudio Member Join Date: Feb 2011 Location: Windsor, Ontario	Will do and update, thanks!

25th August 2011, 11:54 PM	#5
Deadly Sones diyAudio Member Join Date: Feb 2011 Location: Windsor, Ontario	Caps all appeared fine but I will go over them again. Thanks.