2. misc-audio
  3. 149099-132579

scratchy sound from tweeter

Hi everybody reading this. Love music but have not a clue about electronics. Since my arthritis stopped me from playing piano and guitar I now listen to vinyl from my old vintage system. Fisher Studio Standard - CA-880 and small Relistic minimus speakers. I bed you laugh now but hey - I am on a small retirement budget.

Sometimes I like to crank the music up (loss of hearing helps doing so). Now a problem occurred while listening. Mostly the left speaker makes a scratchy sound especial when volume goes up.
But there is also a bit scratch in the right one but about 90% less. I changed to wires to reverse left and right speaker to check.

I first thought it could be the 1980's amp condensers. (They might could benefit from a replacement too)
Since the left speaker was observed to have a problem I changed the tweeters in both speakers.
But the problem is still there. It feels when the amp gets warm it increases the scratch.
Question: Is it possible that only the crossover in the left speaker is bad ???
Thanks upfrontPuu
puu
puu OP
23 posts
 
Mahalo Millercarob for your speedy reply and detailed instructions - highly appreciated!!!  Will check soon.

Sounds like you know the amp. I misten thought it is 80 w since I  picked somewhere up, the 880 uses two (one for each channel) STK-0080 power amplifier paks, and they are rated at 80 watts.You are right, all happened after I cranked the amp up to the edge of distortion. My mistake and I regret, but still love the nice blue

vu meters on them ....


puu OP
23 posts
 
As suggested, I took a 9 volt battery from a remote and tested.

Only on first contact I hear a static sound and see the bottom speaker membrane move (depending on polarity) in or out. No sound there.
I cannot observe a membrane moving at the tweeters.

I also tested the old tweeters this way, one is making a static sound on first contact and one does not make any sound.
Can the crossover be blown or is something bad in the amp???
roberjerman
4,319 posts
 
Voice coils are rubbing against the magnets! Turn down the volume before the damage is permanent!
roberjerman
4,319 posts
 
One of the 8 inch woofers in my Snell E's now does this all the time! So I had to buy a replacement pair from SEAS! Careful with that volume control!
roberjerman
4,319 posts
 
You can find a pair of ADS 200 speakers available for not much money! Same size and configuration as the Radio Shacks. But much better build quality! USA - built! 
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