V72 German Mic. Preamp

[Jazz]

A client of mine brought one into the studio tonight and I used it on drums with a room mic, sounded nice. Antbody know anything about these ?

Thanks

~R

:thumb:

 

[beatpoet]

I can safely say that noone here has ever heard of one :shock:

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[Jazz]

HA, it's a great pre we know that.....Telefunken, did some research I know. Thats not what I meant.

 

[Jazz]

[quote author="beatpoet"]I can safely say that noone here has ever heard of one :shock:

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There is a smart ass in every crowd.

 

[clintrubber]

[quote author="Jazz"][quote author="beatpoet"]I can safely say that noone here has ever heard of one :shock:

------------> Search[/quote]

There is a smart ass in every crowd.[/quote]
And a lazy one as well :wink:

 

[W DeMarco]

If its a V72 it sounds awesome as a mic pre for tube mics. I have some V72 a's that are more for non-tube mics. I use them to beef up signals as well. Run a track through them on mix down or reprinting. The V672 is the solid state counterpart. Another great pre for lots of uses. I like those on hi hat for some reason. My advice is to use the **** out of that pre while its there. Then hide it as your client is packing up to leave. Tell him the rule "If I touched it, its mine." Then kick him in the balls, take his payment, and tell him to get the F@#$ out. Or strike a barter, bonus time for the pre. Beware though that baby will distort, Im sure you quickly noticed that!

Have fun with it!

Will

 

[Jazz]

This V72 needs some help so I wanted to clean up the wiring a bit. There is a wire from a transformer that I am un sure about. Would anybody be able to assist me in some way.

Thank you.

:green:

 

[Jazz]

[quote author="clintrubber"][quote author="Jazz"][quote author="beatpoet"]I can safely say that noone here has ever heard of one :shock:

------------> Search[/quote]

There is a smart ass in every crowd.[/quote]
And a lazy one as well :wink:[/quote]

Must admit, you got me there, I should have read up a bit before asking.

 

[Jazz]

[quote author="W DeMarco"]If its a V72 it sounds awesome as a mic pre for tube mics. I have some V72 a's that are more for non-tube mics. I use them to beef up signals as well. Run a track through them on mix down or reprinting. The V672 is the solid state counterpart. Another great pre for lots of uses. I like those on hi hat for some reason. My advice is to use the **** out of that pre while its there. Then hide it as your client is packing up to leave. Tell him the rule "If I touched it, its mine." Then kick him in the balls, take his payment, and tell him to get the F@#$ out. Or strike a barter, bonus time for the pre. Beware though that baby will distort, Im sure you quickly noticed that!

Have fun with it!

Will[/quote]

I see eye to with you on this area. :green:

 

[W DeMarco]

Post up some photos of the wiring. One of these guru types will surley be familiar, or somewhere there should be a pinout for the connector used. Look at the tech library possibly.

 

[Jazz]

http://www.coolfilmmusic.com/v72

This is the issue. The two blue wires from the power transformer and the green wire from the output transformer with the fuse. There is a green/black cloth wire. Thats basically it.

I noticed two other things and wanted advise on that also.

http://www.coolfilmmusic.com/blue%20cap
This blue electrolytic cap is a crappy chinese cap, This makes no sense on a high end piece of gear like this.

One other cap I noticed that was changed was this black cap.

http://www.coolfilmmusic.com/black%20cap


Any advise would be greatly appreciated. I'm doing this for free for a client becasue this fine piece of gear had some really horrible wires hooked up and it made me sick. :green:

if you save these then you can zoom pretty good

 

[W DeMarco]

Hey man,

You said it sounds good yeah? If so I would'nt mess with those caps. As long as they hold their value their not gonna F with your sound. On the other hand that wiring looks real shakey. Im assumng they terminate in XLR's. If so I would get some decent balanced cableing, real flexible, and rewire the in out on it. Im suprised that there is no connector on that fella. If it works don't mess to much as its not yours. Or you culd tell the client you got carjacked and it was in there!

Good luck with it. I know a cat name Helsing has good experience with Tele V stuff. He racked up the stuff at Vutureland at a great deal. If you track him down, he is on the forum somewhere, he might be able to give you some real insight.

 

[rafafredd]

I do like these crappy blue caps on some of my DIY, but for an original V72?? I don´t know.

 

[Jazz]

I figured out what I needed to know. Talk about kick yourself in the ass. I was stumped. I'm looking at the output transformer....well right on top of or next to it is a small non conductive fiber type material that holds a fuse......that fuse however has nothing to do with the output transformer.
It is for the power transformer.

If you have no experience with this hardware you may be fooled as I was thinking that it was actually part of the output transformer. So I kept going back to the schematic over and over trying to find a fuse on the output transformer.

Finally, after viewing it closer under a magnifier I can see that this fuse holder only shares some real estate with the output transformer but has no part of it. I kept thinking, heck maybe this is a V72a or some other version.

I really love the V72, my first experinece with it. German craftsmanship, I have always loved. But man, this is really interesting to me after studying the LA2A and the Neve 1272.

My Grandfather was 100% German, he had some verbal lines that you just had to laugh at. My favorite of his was this line.......Lets say a tool just broke in your hands while you used it. He would say "In Amereica you buy the best and you still bought **** !!!

 

[CJ]

Most V tube modules are microns from melt down.

I am finding what Ollie says to be true, every V module should get a complete overhaul, including rewinding all transformers.

otherwise, you will just fix one problem after another.

and it is swiss watch.

use better fuse holder.
orig sucks.

enjoy it, or fork out to Ollie.

Otherwise, don't touch.

The transformer designs are good, but the windings are the worst I have ever seen.


Hmmmm.....

every box different sounsd maybe?

 

[Jazz]

[quote author="CJ"]Most V tube modules are microns from melt down.

I am finding what Ollie says to be true, every V module should get a complete overhaul, including rewinding all transformers.

otherwise, you will just fix one problem after another.

and it is swiss watch.

use better fuse holder.
orig sucks.

enjoy it, or fork out to Ollie.

Otherwise, don't touch.

The transformer designs are good, but the windings are the worst I have ever seen.


Hmmmm.....

every box different sounsd maybe?[/quote]

Yea, I hear ya. Why waste all that time when one could be creating music instead. Many things are best left to the expert.

 

[Michael Tibes]

[quote author="Jazz"]heck maybe this is a V72a or some other version.[/quote]

Exactly. What you have is either a V72a or a V74/V74a. They share the same chassis but have different input xformers if I remember right.

every V module should get a complete overhaul, including rewinding all transformers. otherwise, you will just fix one problem after another.

I have overhauled a lot V modules and have quite some still in use. The xformers are still reasonably stable and cosidering the price of a rewinding or even a new one I wouldn't do that just because someone wrote it on the net.
I haven't had any xformer brake for many years.
I do replace the caps and check the resistors though. And of course fix the fuseholders, they're kinda the weak spot on the whole V 7x series.

Michael

 

[CJ]

I remember Ollie saying that some factories were better than others, Siemens better than Telefunken, for example.

MT, are all of yours different, or did they all come from the same place?

Not only the xfmr problems, but also the wires that connect to them.
The melting, evaporating silk insulation.

 

[Jazz]

[quote author="CJ"]I remember Ollie saying that some factories were better than others, Siemens better than Telefunken, for example.

MT, are all of yours different, or did they all come from the same place?

Not only the xfmr problems, but also the wires that connect to them.
The melting, evaporating silk insulation.[/quote]

Yea, I read about those issues also, fully agree with regarding messing with one. I'm not messing with this one. Thinking of buying the ones Olie makes.

 

[KianMcEvoy]

Does anyone here own a working V72?

For my dissertation i'm looking into building a VST clone of a V72 that models it's analogue counter-part component by component, designed from the circuit diagram and the tube specs available.

I was wondering if anyone could help me? In order to compare my model with the original I need to run a short set of test tones through a V72 (around 2 mins of audio) and record the output.

This comparison between the original and the model I make is the cornerstone of my dissertation and it's proving tricky getting access to one, if anyone is able to help me with this it would be hugely appreciated and i'm happy to reimburse anyone for any time/expense incurred.

If you or anyone you know can help, please get in touch.

Many Thanks,
Kian

email: [email protected]