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 11 
 on: April 20, 2017, 11:48:59 am 
Started by zerofly - Last post by zerofly
That seller's statement flies smack in the face of the stamped declaration of "Made In Western Germany"!

Hahaha,
Yap, did it even look at picture after his reply.
Nice one!!!

 12 
 on: April 20, 2017, 10:34:28 am 
Started by zerofly - Last post by uwe ret
That seller's statement flies smack in the face of the stamped declaration of "Made In Western Germany"!

 13 
 on: April 20, 2017, 09:37:09 am 
Started by zerofly - Last post by zerofly
Hello Klaus,
Yes, your probably the person who has seen more of these tubes.

Yap, sounds like rip off, i'm not going for it.

plus, when i contacted the seller regarding the aspect of the tubes i got this:

As far as I confirmed this item is unused however the supplier bought it
which made in the former East Germany 30 years ago in USA .
It would be compatible with AC701 K which made in West Germany.
We will be cover the warranty for bad tubes.
Please consider it.


Any truth in this?

thank you very much for the help!!
Kind regards,
Pedro

 14 
 on: April 20, 2017, 08:30:21 am 
Started by alrettich - Last post by alrettich
It's been about ten years since I was in a studio tracking, technology was a bit different back then.
Redesigning a studio. For a headphone amp system they are currently using a old Furman set up. They want to bring it up to new technology. Allow folks to sub mix what they need to hear. What are studio's using now days?

 15 
 on: April 19, 2017, 08:51:49 pm 
Started by Mikeyod - Last post by radardoug
One thing I have just noticed is the zener diode D7 which is supplying 11 volts to lots of stuff. That could be a candidate. Also, presumably it is to some degree temperature dependant. Maybe get in with a can of freeze spray?

 16 
 on: April 19, 2017, 06:36:34 pm 
Started by J. Mike Perkins - Last post by uwe ret
These U87us do look legitimate and in surprisingly decent cosmetic condition. The very early series (not really 'prototype') did not have the internal battery option, thus no meter either.

 17 
 on: April 19, 2017, 06:34:56 pm 
Started by J. Mike Perkins - Last post by klaus
Aside of the capsules which are not shown, the amps look authentic.

 18 
 on: April 19, 2017, 05:38:08 pm 
Started by J. Mike Perkins - Last post by J. Mike Perkins
A seller on ebay is offering what they claim to be Neumann U87 prototypes #032 and #035.  Interesting photos show a different circuit layout than anything I have ever seen on a U87.  Comments anyone?  Price is high, but these look like they would be a great addition to someone's Neumann mic museum. 

http://www.ebay.com/itm/Vintage-NEUMANN-U87-Microphones-Prototypes-Ser-No-032-035-/332180379193?hash=item4d577e5639:g:4RMAAOSwc49Y7PEs

 19 
 on: April 19, 2017, 05:02:18 pm 
Started by Mikeyod - Last post by Mikeyod
That didn't do it. I don't have a vari-speed hooked up to the machine. But, I wonder on the 1.080.372 card schematic it shows where the vari-speed hooks in. Could any of those components cause a pseudo vari-speed, if it were to begin to fail. Like C24,C11, R58, R59. Maybe R28 in series with the pot R27 ?

 20 
 on: April 19, 2017, 04:25:15 pm 
Started by Mikeyod - Last post by Mikeyod
changed Q5 & Q6  no change and wave looked the same on the scope
Will now do Q7,8,9.

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