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Author Topic: Who Engineered The V76?  (Read 7573 times)

Radd 47

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Who Engineered The V76?
« on: January 08, 2005, 01:29:12 am »

OK, it was obviously a group effort that evolved over time, or was it?

Was it directly derived from the V72 or was it started as a fresh project?

I finally realized after staring at the V76 schematic for a couple of hours that as the gain is increased, that the 50 uf grid input cap gets closer to ground and therefore provides some tone compensation in the way of increased bass response. Pretty clever.
Who was the genius who came up with that!

Also, after checking the resistors on a friend's old V76, I couldn't believe that they were still in exact tolerance. Carbon comps drift, so what are those skinny brown things made from?

Thanks Olliver for all the answers to my nagging questions.
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Oliver Archut

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Re: Who Engineered The V76?
« Reply #1 on: January 08, 2005, 04:27:48 pm »

In the time period of 1946 to 1956 the radio station, that was set up by the british occupying forces, the NWDR (North West German Radio) developed many of the audio jewels we call classics today.

Due to the restriction of the Allied forces after WWII german engineers were not allowed to developed, research or build/manufacture, any other aspect of electronic than what we call today consumer electronic.
Many of the brilliant minds that thought up the guidance systems for rockets, the german version of the radar and radar deflecting systems, were now back to the drawing boards developing, either radios receivers or transmitters and related items...

With manufacturing equipment of the former R&D center of the german navy and the former Imperial Broadcasting Agency (Reichsrundfunk) the now called "Technische Werkstaeten/Zentral Technik" (central technology) started to develop an entire new standard and the equipment for audio/recording equipment that was use in the new german broadcast network.
About 20 engineers worked under the technical supervision of Prof. Nestler the former Head of R&D of Telefunken ELA (Electro Acoustic) Lab.

Aside 90% of all V /U and W-series modules, they also developed and build the M49, the KK47 capsule and the MSC series of tubes, the first SD nickel capsule microphones, the 140 Hall plate and several test/measuring instruments. Later licensed to companies such as Neuman, Hiller, Telefunken, Siemens, the historic TAB, EMT, etc. etc.

In 1956 everything was over, the german government split up the NWDR into several smaller radiostations now called NDR/WDR/SWF/SDR, etc.
The Zentral Technik became the IRT (Institute for broadcast technology) and moved from Hamburg to Munich.

All V-Series pre amplifier were based upon the pre war/war times V40 series,  V72 and V76 where developed about the same time on the V41 preamp, etc.

The resistors are Rosenthal metal oxide.... relabeled for the different companies; grey Telefunken, red TAB and Neumann and green Siemens.

Best regards,
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Oliver Archut
www.tab-funkenwerk.com

We are so advanced, that we can develop technology that can determine how much damage the earth has taken from the development of that technology.

KFF

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Re: Who Engineered The V76?
« Reply #2 on: January 08, 2005, 05:52:47 pm »

Fascinating read.

Thank you Oliver,
Ken
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RMoore

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Re: Who Engineered The V76?
« Reply #3 on: January 08, 2005, 08:23:57 pm »

Wow - thats amazing!
Thnx!
RM
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Bob Olhsson

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Re: Who Engineered The V76?
« Reply #4 on: January 16, 2005, 04:11:00 pm »

Oliver Archut wrote on Sat, 08 January 2005 15:27

...
Due to the restriction of the Allied forces after WWII german engineers were not allowed to developed, research or build/manufacture, any other aspect of electronic than what we call today consumer electronic.
Many of the brilliant minds that thought up the guidance systems for rockets, the german version of the radar and radar deflecting systems, were now back to the drawing boards developing, either radios receivers or transmitters and related items...


Many German engineers and physicists were forced to choose between moving to the United States or to the Soviet Union with remaining in Germany not being an option. My best college friend's father was among these. He ended up in top management positions at a number of major defense contractors, made lots and lots of money but was still very scarred from having been forced to move to the United States at gunpoint.

It's interesting that these WERE probably the last generation of professional audio devices to be designed by top level design engineers. Around the same time, Bell Labs and RCA were discontinuing their work in the area because the patents that had allowed them a monopoly market position and lease-only terms to their customers began expiring. During the 1930s and '40s these had been among the highest paying positions available to engineers because the more reliable the gear, the more money RCA and Western Electric would make. "Broadcast quality" was the benchmark by which most other electronic devices were judged.

Oliver Archut

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Re: Who Engineered The V76?
« Reply #5 on: January 16, 2005, 06:50:53 pm »

Hello Bob,

you are right that the Americans, Brits and Soviets were trying to get a hold of the designers/mechanics of the german rocket program.
However most of the EEs were not as valuable to the allied forces, so people like Prof. Dr. Runge, later head of R&D at AEG-Telefunken, who designed the electronic guidance system for the V1 and later V2 worked on the V/U series audio program after the war.
There were several different electronics for the rocket program, developed by AEG-Telefunken, Siemens, Lorenz and other smaller R&D labs, the general circuit, ring modulator controlled by four EF14 tubes via audio frequencies was Mr. Runges idea. His analog concept of remote controlling is still found today in any RC car....

Aside him several other german weapons EEs, some of the guys that came up with the audio guided torpedo, etc. worked later at the microphone development at the NWDR. I talked with several of them over the years, all of them are dead by now.

There is a great series of books published by the AEG-Telefunken company in the early 1980s, about all the different weapons electronics, radar, sonar, etc. Very hard to find these days and in german...

It is quite amazing how these german black programs influenced the entire electronic industrie...

Best regards,

Oliver

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Oliver Archut
www.tab-funkenwerk.com

We are so advanced, that we can develop technology that can determine how much damage the earth has taken from the development of that technology.
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