B&K Amp problem- need advice
Ern Dog
Posts: 2,237
I just got a used B&K ST-202, 2 channel amp for my fronts. I noticed that there is a single pop noise when I'm listening to cd's that occurs during the space between songs.
Can't seem to figure this one out. I'm using cheap IC's until my Signal Cables arrive in the next day or two. Anyways- I doubt the cables are the problem. Anybody have the prob before or know how to fix it?
Can't seem to figure this one out. I'm using cheap IC's until my Signal Cables arrive in the next day or two. Anyways- I doubt the cables are the problem. Anybody have the prob before or know how to fix it?
Post edited by Ern Dog on
Comments
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Have you tried a different CD player to rule that out? If it pops only between each track, it seems more likely to be the player, not the amp.
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I highly doubt its the amp if its only occuring during track breaks. What happens if you pause the CD? Any noise? Are these original CDs or burned?For rig details, see my profile. Nothing here anymore...
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I wouldn't think it would be an amp problem either.. does it do something similar with other sources?
Do you have any other CD player you could try out?PolkFest 2012, who's going>?
Vancouver, Canada Sept 30th, 2012 - Madonna concert :cheesygrin: -
After fiddling around more I tried a couple things. I hooked the cd player directly to the amp to bypass the HK AVR and still got the pop. This pop occurs on original cd's and burned, however on some original cd there is no noise. When I pause a song in play, the pop occurs.
The only reason I initially thought it was the amp was because I didn't have this problem before addiing it to my system. Also when I take the amp out of the system- there is no pop between songs. I don't have another cd player to test and all other sources are fine.
I called B&K customer service and the tech person said it sounded like a pre amp problem and that firmware updates could resolve it. As mentioned above, I eliminated this as a possibility by removing the pre amp.
Any other ideas? -
Better check the dc bias on the amp for starters. That will be a good starting point to see how healthy the amp is."The legitimate powers of government extend to such acts only as are injurious to others. But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." --Thomas Jefferson
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so far you ruled out the preamp.
Put me in the camp of it's probably the CD player.
BDTI plan for the future. - F1Nut -
sucks2beme wrote:Better check the dc bias on the amp for starters. That will be a good starting point to see how healthy the amp is.
I think you mean "check the DC Offset".
This is recommended every time you aquire a used amp.
Ern, if you don't know what he means by this, let me explain.
If you have a digital multimeter, power up the amp, with no input connected and no speakers connected. Let it warm up for 30 minutes.
Set the multimeter for DC voltage on the lowest range (200mv?). Connect the multimeter directly to the + and - speaker terminals for each channel, one at a time. Be careful not to short between the terminals.
Ideally, you should read close to zero DC voltage when tested (doesn't matter if its + or - voltage). It may fluctuate slightly (+/- 5mv). Anything over 30mv might be a problem, if you are over 100mv, definetly a problem.
Honestly, too much offset usually results in a distorted sound, not poping noises.
If you are not reading an offset problem, you may also check the amp, hooked to the speakers, no input. Leave it for an hour, see if you hear any pops by itself.
If the amp is the problem, B&K will fix these amps quite reasonably. I sent my ST1400 to them for an offset/distortion problem and the repair cost was only $131 including return shipping and new original box/packaging.For rig details, see my profile. Nothing here anymore... -
You are correct. Multitasking gets harder when you hit 50!billbillw wrote:I think you mean "check the DC Offset".
This is recommended every time you aquire a used amp.
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The real **** about this is getting a good deal on the amp, then getting hooked $$$ to fix it.
The seller may not even of known there was a problem.
He may of just assumed it was normal.
Borrow a player from someone else. If the problem remains, time to
turn a tech loose on the amp. Better to pay them then possibly damaging your speakers."The legitimate powers of government extend to such acts only as are injurious to others. But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." --Thomas Jefferson -
Try a set of headphones on your preamp with the CDP playing.
That would at least tell you if the amp's good.
If its popping there, it would be the CDP."The legitimate powers of government extend to such acts only as are injurious to others. But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." --Thomas Jefferson -
Sucks2beme,
Just tried using some headphones on the preamp w/CDP and there was no pop noise- which is more evidence that it is the amp.
billbillw,
I don't have a meter to do the test you recommended.
I contacted the seller and he is willing to give a refund. I think I'm gonna take that route.
Thank you all for your help. I really appreciate it.
