NOS Haufe RK282 – info needed

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Claudio

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Hello everyone,

I was given a few ‘new old stock’ Haufe RK282 transformers, I suppose from the 80s or older. However, I can’t seem to find any info or datasheet for this model. Can anyone help me out?

Thanks,
Claudio

 

rock soderstrom

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Hi Claudio, here is all I got. If you need translation, just ask. Cheers
 

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Claudio

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Wow, that was fast. Thanks a lot!

I don’t need any translation, I’m German, too.  :)

So have you used this transformer in one of your projects? What was it? How did you use it?

Thanks,
Claudio
 

rock soderstrom

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No, I have not used this model yet, but similar ones. Relatively difficult to drive for a tube guy. You can also use them as input transformers. Silent Arts Volker has a few projects where similar transformers are used....Grüße  ;)
 

Claudio

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Yes, I first came across the Haufe transformers when I built Volker’s modules. I should contact him. :)
 

volker

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Claudio said:
Wow, that was fast. Thanks a lot!

I don’t need any translation, I’m German, too.  :)

So have you used this transformer in one of your projects? What was it? How did you use it?

Thanks,
Claudio

It's a opamp output transformer. Or some other circuit with plenty of NFB and similarly low output impedance.
 

Claudio

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Hey Volker! :)

Sorry to ask, but what is an opamp output transformer? Do you mean a transformer that follows an opamp in the signal chain?

And what does NFB mean?
 

rock soderstrom

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Claudio said:
Sorry to ask, but what is an opamp output transformer? Do you mean a transformer that follows an opamp in the signal chain?

And what does NFB mean?


You need a relatively large amount of current to drive these transformers, low impedance. This is achieved with potent opamps and/or transistor buffers. These transformers do not fit well to tube circuits.

NFB= negative feedback to lower the impedance.
 

Claudio

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For anyone who needs it, here’s the official datasheet that Haufe sent me.
 

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