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my au717 chatching a buzz

x37tuna

x37tuna

Active Member
good eveing to all.. i play my system about once a week or so but this morning i wanted to hear a little bit before work. all was good, couple of songs. ready for the work day..went to power it down, turned off the cd player,went to turn off the amp and thought i heard a noise, a noise nobody likes to hear....yep my au 717 caught a buzz, im bummin.... this is the same amp that you guys help me with last winter rebuilt the ppb and both driver boards.. worked great very nice..the last mounth or so i thought that i mite be looseing some of the high end off it but thouhgt it mite be the age of my ears kickin in. allthough i use this amp more for the bottom end , i do have a 517 that i use to drive my upper levles.. anyway the buzz that im getting is when i turn the amp on put the speaker selector on A no cd player on or anything i can hear it on both chanels if i turn the volume up it gets louder not really a loud buzz but i can deffanitly hear it..i had some plans to work on my system this winter (other stuff i want to do) but i need to get this back into shape before anything.. so if some one could stear me in the right direction or have any ideas what i mite look for it would help me out a lot..thanks for your time ..........x37tuna...........
 
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well just for a udate on a dead thread........(seams ive been shune for some reason)...did find a bad power supply cap, replaced it, still have the buzz.kinda geting usedto it maybe thats what they mean by the great sansui sound.............................x37tuna................................
 
You have a grounding problem somewhere. Disconnect all your input devices and see if it still persists. If its gone, one of your components is causing a ground loop and you need an ground loop isolator between the suspected component and your amp.

If the problem still persists, get a scope and look at the power supply output after the rectifiers. It should be fairly clean. If you see ripple in the DC output then a rectifier diode or input filter may be at fault.
 
thanks for the reply jordan...i did go through and dissconect everything and the buzz was still there. so its something in the amp itself...was just woundering,,, when i saw that one of the main caps were bad the oil for it kinda went all over, i am no tech but was woundering if this fluid could cause any damage to other components in the amp. thanks agian.........................x37tuna.............................
 
x37tuna said:
thanks for the reply jordan...i did go through and dissconect everything and the buzz was still there. so its something in the amp itself...was just woundering,,, when i saw that one of the main caps were bad the oil for it kinda went all over, i am no tech but was woundering if this fluid could cause any damage to other components in the amp. thanks agian.........................x37tuna.............................
Click to expand...

yes, it is conductive and will cause all kinds of problems if not cleaned well.

Lefty
 
thanks for chiming in guys.. i will pull it out this week and give it another going over...never seen one leek out like that before. i asume this is do to age, the leads on the cap were corroded. thanks agian for the direction.........x37tuna..........
 
well im glad to say i found the problem,took it apart last night to see if i could find anything obvious, couldnt if a thing . so i talked to my tech guy today to see if he could fit me in to take a look at it , told me to bring it in tomarrow. got home, went to put the covers back on it so i could take it to him in the morning, thought i'de take another look around, and there it was.... last winter when i rebuilt the ppb the number 13 wire that you have to take off inorder to get the board out, had a bad soider joint, wire was working loose.. desoidered,, cleaned it up... resoidered..powered it back up, put a speaker to it,,,, and the buzzzzzz wazzzz gone..reset the bias and offset back on the main system it went.. played it for a couple hours, no problems, no buzzen.. its good to have her back..........x37tuna........
 
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