Mic output transformers

I need a special mic output transformer made, to fit as replacement into vintage Microphones (AKG C414 P48), as the originals are not available anymore (they were made in-house)

I have all the specs and construction details, I also have a few broken ones for investigation. However all manufacturers I contacted so far (Haufe, Pikatron, Sowter) declined to build one as they don't have cores or formers of the size necessary.

I would need about 15-20 pieces for the beginning.

Any ideas whom to ask?

Best

Georg

Maybe call David at Cinemag?

You have 15 broken 414s, all with bad trannies??

Matador said:

Maybe call David at Cinemag?

Click to expand...

David is the man!

David Geren
cinemag (at) att.net

Regards!

HL

Drop me the  mail, maybe I can do something about it.

Thanks for all the contacts and ideas, i'll keep you updated on the progress.

(and no we don't have 15 broken mics yet...)

MagnetoSound]You have 15 broken 414s said:

.....
(and no we don't have 15 broken mics yet...)

Click to expand...

... only 15 chinese CK12-clones who need an output-transformer 

I guess I fell for the sleight-of-hand in the OP then ...  :

tonzauber said:

I need a special mic output transformer made, to fit as replacement into vintage Microphones (AKG C414 P48), as the originals are not available anymore (they were made in-house)

Click to expand...

Well, if we had a chinese clone, the dimensions would not be so critical, would they?

Btw, the C414-EBP48  was originally never delivered with the brass CK12, but already shipped out exclusively with the "nylon" Ck12.

And if I were to build mics around CK12, i would rather go with a design that uses the readily available T14/1.

This is just a sourcing project to keep this type of microphones alive.  Unfortunately, the original xformers are a littlebit on the fragile side, mechanically, and therefore tend to fail when the mics are dropped or abused in another way.

tonzauber said:

And if I were to build mics around CK12, i would rather go with a design that uses the readily available T14/1.

Click to expand...

T14 sized is OK idea, but ratio is not adequate.

tonzauber said:

This is just a sourcing project to keep this type of microphones alive.

Click to expand...

Good plan! 

Georg, I sent you few mails and in the meantime there is one more possibility for this project. Are you still interested in ? If not, just let me know so I can cancel all of  possible deals regarding laminations.
If yes, please respond so we can continue.

Moby said:

T14 sized is OK idea, but ratio is not adequate.

Click to expand...

What is the best ratio?

hitchhiker said:

What is the best ratio?

Click to expand...

The original transformer has a ~ 1:1 ratio (with a bigger core than the T14/1)

analogguru, I can't imagine putting a 1:1 ratio transformer in my elam251 build?

hitchhiker said:

What is the best ratio?

Click to expand...

6:1

hitchhiker said:

analogguru, I can't imagine putting a 1:1 ratio transformer in my elam251 build?

Click to expand...

As far as I understand is this thread about

tonzauber said:

I need a special mic output transformer made, to fit as replacement into vintage Microphones (AKG C414 P48), as the originals are not available anymore (they were made in-house)

I have all the specs and construction details, I also have a few broken ones for investigation.
.....

Click to expand...

Possible thread derailments are not my fault and were/are ignored by me.  And when I wrote:
[quote author=analogguru] The original transformer has a ~ 1:1 ratio (with a bigger core than the T14/1)
[/quote]
then I was talking about the AKG C414 (which is not a tube microphone).

analogguru,  the thread title is "Mic output transformers" so I was wondering what would be the ideal output transformer (t14/1?) ratio for a 6072 build of an elam 251 and I apologize for not stating that clearly right off.

Moby, is 6:1 better for an output ratio on a 6072 build of an elam 251 ?

hitchhiker said:

analogguru,  the thread title is "Mic output transformers" so I was wondering what would be the ideal output transformer (t14/1?) ratio for a 6072 build of an elam 251 and I apologize for not stating that clearly right off.

Moby, is 6:1 better for an output ratio on a 6072 build of an elam 251 ?

Click to expand...

No, sorry, I was talking about AKG C414 P48 transformer.
T-14 is 11.5:1

hitchhiker said:

Moby, is 6:1 better for an output ratio on a 6072 build of an elam 251 ?

Click to expand...

Count the output impedance with 6:1 - no it isn't better

All transformer based C414 (excpet B-ULS) are 2:1 output irons, only B-ULS is 1:1.