I turned on my 75A4 after having been off for a long time, and it sounded
very distorted...not at all smooth.
I figured "well, finally it is my turn to replace them caps".
Just for yucks, I tried it with headphones....sounded fine.
So, I figure the problem is in the audio stage.
Again for yucks, I tried another speaker in the headphone jack.
Sounded fine.
I took a look at that matching Collins speaker. If I apply slight pressure
on the magnet, the sound clears up.
I've had this problem with transistor radios, where the voice coil is not
aligned and the sound goes to heck. I've been able to fix those little 2
inchers by bending them. But this speaker is too big for that.
Any ideas what can be done?
....Dave

Dave Edwards wrote:
I turned on my 75A4 after having been off for a long time, and it sounded
very distorted...not at all smooth.
I figured "well, finally it is my turn to replace them caps".
Just for yucks, I tried it with headphones....sounded fine.
So, I figure the problem is in the audio stage.
Again for yucks, I tried another speaker in the headphone jack.
Sounded fine.
I took a look at that matching Collins speaker. If I apply slight pressure
on the magnet, the sound clears up.
I've had this problem with transistor radios, where the voice coil is not
aligned and the sound goes to heck. I've been able to fix those little 2
inchers by bending them. But this speaker is too big for that.
Any ideas what can be done?

Ask your local speaker reconer. Most of these speakers aren't worth the
money to have them rebuilt, but Cardinal Sound in Maryland does nice work
and seems to be able to work on anything.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Dave Edwards wrote:

I took a look at that matching Collins speaker. If I apply slight pressure
on the magnet, the sound clears up.
I've had this problem with transistor radios, where the voice coil is not
aligned and the sound goes to heck. I've been able to fix those little 2
inchers by bending them. But this speaker is too big for that.
Any ideas what can be done?
...Dave

I take it that it doesn't have any screws holding the spider to loosen
and recenter the voice coil?

If the spider is glued into place maybe it has come loose. If it hasn't
then you can use an xacto knife to slit around the perimeter to free it.
Then you can recenter the coil and glue it back down.

Sometime you get lucky and this works easily :-)

-Bill