Urgently needed: 2121 (H)

[Guido]

Hello out there!

I urgently need a pair of 2121 or 2121H or 2122H. It doesn't matter in what condition the cones and foams are.

[4313B]

You can use an LE10A, K110, LE10H, LE10H-1, LE111H, 2120, 2121, 2121H, or 2122H to build a 2121.

You cannot use an LE111A, 2123H or E110 basket. They're different.

[Guido]

Originally posted by Giskard
You can use an LE10A, K110, LE10H, LE10H-1, LE111H, 2120, 2121, 2121H, or 2122H to build a 2121.

You cannot use an LE111A, 2123H or E110 basket. They're different.

Hello Giskard!

Bring an old thread to new life

Could you please explain what is different with the LE111A?
2123 is clear, completely different.
E110, thicker magnet, right?

But LE111A????

[4313B]

Well... I'm kind of glad you brought it up again Guido.

Here's the scoop - technically any of the LE10 baskets can be reconed with any of the LE10 style cone kits. Gap width will vary from 0.048" to 0.057". Flux density will vary from roughly 1.00 T to roughly 1.08 T. Some years certain transducers were spec'd at 1.05 T such as the LE10H and E110. Other years they were spec'd at 1.08 T or 1.02 T or 1.00 T. Some very old LE10 units won't handle any of the kits today. Bottom line - the printed specs are wrought with inconsistencies. Your best bet would be to use the SFG ferrite assemblies since they are more consistent than the alnico assemblies and try to use newer cores rather than older cores.

Here are some "published" gaps:
K110 0.048"
E110 0.057"
2120 0.048"
2121 0.048"
2121H 0.048" 0.057"
2122H 0.048" 0.057"
2123H 0.057"
LE10A 0.048"
LE10H 0.053"
LE111A 0.053"
LE111H 0.053" 0.057"

[4313B]

Originally posted by Guido
Hello Giskard!

Bring an old thread to new life

Could you please explain what is different with the LE111A?
2123 is clear, completely different.
E110, thicker magnet, right?

But LE111A????
The reason I excluded the LE111A was because it had such a high published flux density at 1.08 T. However, I'd personally take that with a grain of salt. Besides, it's alnico and I seriously doubt it would hold that density for long even if it was true at one time.

[Guido]

As usual your post is a big help.

Thanks!

I asked because I probably can buy 2 LE111A Baskets and plan to recone as 2121 for my 4343's.

I'm still not shure but I think I'll give it a try.

[4313B]

They will probably work just fine. But, I have to ask, why the 2121 cone kit instead of the 2122 cone kit? G.T. definitely recommends the 2122 cone assembly over the 2121. The soft inverted dome on the 2121 breaks up pretty bad.

[Guido]

I have one more question:

Is the LE10H-1 different from the LE10H? I mean regarding the basket?

[Guido]

Originally posted by Giskard
They will probably work just fine. But, I have to ask, why the 2121 cone kit instead of the 2122 cone kit? G.T. definitely recommends the 2122 cone assembly over the 2121. The soft inverted dome on the 2121 breaks up pretty bad.

I think the 2121 fits better to the 4343 network. With the 2122H I evtl. need modifications in the network.
You pointed out more than once that the 2122H is better. The Transducer replacement list says "closest substitude available" or something like that.

What do you mean?

[4313B]

No, the LE10H, LE10H-1, and LE111H baskets are physically identical (The gaps themselves can vary though, usually they are 0.057" but there are some early 0.053" running around out there).

Oh, and then there are the versions with the terminals mounted straight down on a purpose cast flange and the versions where the terminals are mounted on one of the frame legs which puts them at a 45 degree angle.

[4313B]

Originally posted by Guido
I think the 2121 fits better to the 4343 network. With the 2122H I evtl. need modifications in the network.
You pointed out more than once that the 2122H is better. The Transducer replacement list says "closest substitude available" or something like that.

What do you mean?
Yeah true, the 2121 and 3143 were purpose built as a complete system. I suppose I'd go with either the 2121 and 3143 or the 2122 and 3144/3145 rather than mix things up.

[Guido]

Originally posted by Giskard
Yeah true, the 2121 and 3143 were purpose built as a complete system. Id' go with either the 2121 and 3143 or the 2122 and 3144/3145 rather than mix things up.

:hmm:

I remember that you once recommended to go with the 3145 network as it is "decades better".

Anyway the plan is to get the baskets first

next I will decide the network thing and

then I will buy the cone kits.

In the meantime I can lay back as my 2012H fits quite good with the modification recommended from Earl K.

[4313B]

Originally posted by Giskard
No, the LE10H, LE10H-1, and LE111H baskets are physically identical (The gaps themselves can vary though, usually they are 0.057" but there are some early 0.053" running around out there).

Oh, and then there are the versions with the terminals mounted straight down on a purpose cast flange and the versions where the terminals are mounted on one of the frame legs which puts them at a 45 degree angle.

[4313B]

Oh, just so you know Guido, the LE111A and LE111H frame faces are painted black. I don't know if you prefer the brushed aluminum face instead.

[speakerdave]

Originally posted by Giskard
You can use an LE10A, K110, LE10H, LE10H-1, LE111H, 2120, 2121, 2121H, or 2122H to build a 2121.

Has anyone had LE10A's reconed as 2122H's. I would be interested to know if you were pleased with the result.

David.