n00b PA problem question

agothacles · 9th October 2007, 07:27 PM

I apologize in advance for being ignorant about these things, but i have a lantek (citronic) PPX 900 and after years of working fine it's having trouble that i can't explain properly to technicians.

when first powered on, the amp works fine. but after a few minutes it starts making sounds (through the speakers) that almost sound like wind blowing on a microphone. sometimes, when these sounds increase in intensity, the sound cuts out and distorts for as long as a minute. i've tried it on different speakers with the same result.

can someone tell me what the likely issue is?

Netlist · 9th October 2007, 07:52 PM

I happen to have a PPX1200 on the bench these days and must say they are well build.
Mine has a different problem however.
As a rule of thumb I would check for bad solderings and tighten the TO3 cans as well as the screws of the big power supply capacitors. Check if all op-amps are well seated, too.

/Hugo

agothacles · 10th October 2007, 03:33 PM

thanks for the help!

also, if anybody has schematics for the ppx 900, i could really use them...

william chasney · 16th December 2008, 02:56 PM

Hi
did you get the schematics you required? Sure I have them somewhere if you need them. Regards

Cal Weldon · 16th December 2008, 04:50 PM

Hello William, as of today it's 424 days since the original poster was last here.

9th October 2007, 07:27 PM	#1
agothacles diyAudio Member Join Date: Oct 2007	n00b PA problem question I apologize in advance for being ignorant about these things, but i have a lantek (citronic) PPX 900 and after years of working fine it's having trouble that i can't explain properly to technicians. when first powered on, the amp works fine. but after a few minutes it starts making sounds (through the speakers) that almost sound like wind blowing on a microphone. sometimes, when these sounds increase in intensity, the sound cuts out and distorts for as long as a minute. i've tried it on different speakers with the same result. can someone tell me what the likely issue is?

16th December 2008, 04:50 PM	#5
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Hello William, as of today it's 424 days since the original poster was last here. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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9th October 2007, 07:52 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	I happen to have a PPX1200 on the bench these days and must say they are well build. Mine has a different problem however. As a rule of thumb I would check for bad solderings and tighten the TO3 cans as well as the screws of the big power supply capacitors. Check if all op-amps are well seated, too. /Hugo

10th October 2007, 03:33 PM	#3
agothacles diyAudio Member Join Date: Oct 2007	thanks for the help! also, if anybody has schematics for the ppx 900, i could really use them...

16th December 2008, 02:56 PM	#4
william chasney diyAudio Member Join Date: Nov 2006	Hi did you get the schematics you required? Sure I have them somewhere if you need them. Regards

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