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Author Topic: V76 part ID  (Read 3544 times)

Malotki

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V76 part ID
« on: January 28, 2012, 08:05:37 AM »
Hello All

Another ID request from me ;) I picked up some transformers today and one has some reference to the v76 mic preamp. Wondering if you lot might recognise it?...
Dave

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klaus

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Re: V76 part ID
« Reply #1 on: January 28, 2012, 01:37:21 PM »
Translation:

High Frequency attenuating circuitry from V76 (35-40kHz)
In this case, it's a choke coil/transformer with a 4:1 ratio.
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Klaus Heyne
German Masterworks®
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David Satz

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Re: V76 part ID
« Reply #2 on: January 28, 2012, 04:44:06 PM »
Does that really say "V76"? Looks a lot more like "V7b" to me.

Also, I probably would translate "HF Löschkreis" as "RF erasure circuit" although that would depend to some extent on what a V7 was, which I don't know.

--best regards
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klaus

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Re: V76 part ID
« Reply #3 on: January 28, 2012, 05:26:40 PM »
Not familiar with a Telefunken preamp unit "V7b". Also not familiar with the term "erasure circuit" in any mic pres.

Only usage for that term I could find was a reference to AEG WW II tape recorders with V7(b) amps.

So, after all, maybe these transformers were just that: parts of the erasure head circuitry of an AEG tape recorder.
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

Malotki

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Re: V76 part ID
« Reply #4 on: January 29, 2012, 03:43:02 AM »
You guys nailed it! it is a b and the guy I hot it from was in Germany in ww 2 and working with tape.  Cheers for your research. Got one last transformerto I'd...
Cheers
 Dave
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fma

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Re: V76 part ID
« Reply #5 on: January 31, 2012, 01:42:39 PM »
I'm new to this forum, so hopefully I'm not violating any rules ...

I've got a circuit diagram of the V7b (and the V5 playback amplifier as well) - and as far as I can fathom, they're probably drawn around 1940.
Wanna see?

Since an "Aufsprechverstärker" from the Reichs-Rundfunk-Gesellschaft for the AEG K7 tape recorder is not exactly what this forum is about, it might be better to send the diagram to you via PM.
What do you think?

Best wishes,
fma
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klaus

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Re: V76 part ID
« Reply #6 on: January 31, 2012, 02:31:41 PM »
Feel free to post.

KH
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

fma

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Re: V76 part ID
« Reply #7 on: January 31, 2012, 06:15:32 PM »
Thanks Klaus.
Here are the links for both V7b (rec) and V5 (pb) schematics:

http://www.lesenundschreiben-duesseldorf.de/AEG_K7_V5.gif
http://www.lesenundschreiben-duesseldorf.de/AEG_K7_V7b.jpg

The transformer in question should be part no. 19 at the lower left corner of V7b, driven by the EF11 (no. 24) called "Löschrohr" (=erasure tube).

Sorry for the average picture quality, that's all I could find.
(The V5 playback amplifier is somwehat easier to make out.)

Hope thet helps.

Best wishes,
fma
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