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I'll pop my head inside and have a look tomorrow.
You might be on to something there.
Thanks for that....

Hi Rob.
Good to see you're still hanging about here. ;)
Thanks for that, but the problem runs deep. This unit came back from a gig once and wasn't used again for a while.
After powering up one...

Thanks for that, but sorry for asking, how do I enter that?

10 years later, and I'm still looking for an answer to that question.... :(

I've PM'ed you.:)

That is my Bobby. A terribly handsome Tuxedo. He's gone now... but lives on thru' my avatars in the 'virtual world' out there somewhere..... I miss him heaps.

I tip my hat to your wife. What a...

Yep, that was gonna be exactly my suggestion too!

Have you ever had them set up vertically just on the floor without the 'stands'?

As long as the voice coil lines up in the gap of that top plate you should be good.
How did you go with fixing the pole piece?

Warning: If you break the hammer, you're hitting too hard. Best of luck Mazza. Let us know how you go. :)

OK. I hope you can make sense of this...

One way of re-centering a pole piece without having to demagnetise, is to stick a credit card down the opposing gap, make sure it's exactly opposite the...

Thanks heaps Widget..... :bouncy:

You have to remember that 'most' of 'em are pretty young, so to them 90's IS vintage.... ;)

I was dreadfully ill and diagnosed with stage 4 non small cell lung cancer, and given 2-3 months.
The shock was devastating.
After some (very fast) research, I discovered my hospital was starting...

This place whilst maybe not all that busy, is still the #1 source for ANYTHING JBL or Lansing.
It would take 3 or 4 lifetimes to go through all the wealth of info here. I still come and go here...

Absolutely excellent work droh.
Truly outstanding.

There's a pair here in Sydney Australia that could do with some rescuing.
I'd give 'em a go, but they're just in the wrong place at the wrong...

Oh thank you so much Pellets.
You must be the only person in the whole world that had this schematic.
I had looked almost everywhere.
You're an absolute marvel.

Cheers lots n' lots.....
...

I have a JBL SE401E amplifier that needs some TLC.
When powering up, there's a loud 'buzz' coming equally from both channels.
I've searched and searched, but can't find a schematic for it...

UPDATE:

I think the problem has been solved.

Thank you everyone so very much for the input. I'll issue a summary in a week or so regarding the outcome [with pics hopefully].

Ian, I've PM'ed...

Thanks again Ian and Barry also. [I'll PM you Barry in a few days for more details...]
I shall be discussing all the options mentioned with the current owner once I get a hold of him shortly.
In...

Yep... If you look closely Odd, the two listings seem to use the same photos even tho' they're different sellers.
I feel something's just not right about them, plus the different dustcaps, and look...

Hello Ian,

It's been a very long time since we chatted last. Hope you're good etc?

Yes, QSR was my first thought. I know from past experience that they do most excellent work.
I was even...

OK, so quite a few years back, I came across a pair of 4340's [or were they 4343's?] that had their 2121's repaired by an unknown 'repairer', who obviously took a few shortcuts, by using surrounds...

I wouldn't know which are the 'best ever', as I've heard sooooo many in my lifetime of audio 'dabbling', as I'm sure many out there can pro'ly say the same, BUT one thing I do know, is that most...

…. you could always just use the boxes as Subs.