Schaffer-Vega Diversity System Tag

08 Jul While we wait, “Back in Black” Cetec Vega FRONT Boost

Thought I’d “update” audio wise the state of our research, while we (I at least) wait for the SVDS to come to me tonight.

Since it is now known that the SVDS only boosts from the front panel – which is a different circuit – wanted to try it.

Played with the CETEC-Vega R42/T77


Here’s the result.


Back in Black Cetec Vega FRONT Boost


PS: Important note: recorded with an original 1960s Neumann U67. Settings are IDENTICAL (amp and recording) to the recently played YSMANL video:


You Shook Me All Night Long Cetec-Vega Series

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04 Jul The Schaffer-Vega Diversity System: The Original 1977 Unit (Updated)

Another smaller but important update on the SVDS. I was able to exchange emails again with Mr. Schaffer during my Italian sleep-less night (majorly jet legged here, and so Mr. Schaffer having come back from Russia where he met his long time friend Sting of which he sent me a few pictures) and he confirmed me the following:



From what I remember (I promised: very dodgy) there was no switch per se.. . the XLR is the clean way out… the front panel “monitor” was never meant to be in line… but a lot (most?) guys used the monitor output, I guess sometimes to overdrive the front end of the amp (which the XLR output would not do).


You know –  you can design something with one thing in mind, but once it gets out to the user, it can turn into a whole new ballgame.   Just like writing a song –  once it’s out there, the writer has like nothing to say about it !






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13 Jun High Wattage – AC/DC’s Marshall amps through the years (Work in Progress – UPDATED: Back in Black era uncovered)

Main Research: André Kozuma

Edits and additional info, SoloDallas


So, hello again everyone! 🙂

Here I am again with another article.

This all is mostly things we already know, but I felt that we needed a place to put it all together and make it easier to consult rather than have to search though all the other pages to find the info on the comments or that sort of thing.

What I plan to do is a real Index for everything AC/DC related (gear-wise), but mostly the amps. Perhaps we can cover all of AC/DC’s history, but I can’t do this alone. I would like to ask every member of this community a little help. If you find any bit of info, good pics, videos, whatever it is, that you think it’s interesting, share with us, so we can oficially post it here.

So, let’s start with the amps.

Early Years – High Voltage, TNT, Dirty Deeds Done Dirt Cheap (1973 – 1976)

A few pics:


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01 Jun AC/DC’s “You Shook Me All Night Long” “VEGA” Series

Well my friends, it’s night here and I have prepared all day long for our departure tomorrow to go “back to the States”.

We’ll be in San Diego, CA, for a month. The 4 of us.

Didn’t want to have you hanging for nothing though. So I did this.

Latest effort in replicating “Back in Black” sound. Using a newly acquired Neumann U67 and all the Universal Audio plug-ins you see in the image. Carefully crafted.

Will update this post with more info. For now, you get the video.



Fil 🙂

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29 May Updated: Wiring the Vega Transmitter and changing input impedance from microphone to guitar

Hello Guys,

Member Mike has another update for us. Below, after the wiring instructions, you will find detailed instructions for the 50 kohm modification which is needed to operate the Vega transmitter (initially built for microphones) correctly with guitars. Thanks, Mike!

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29 Apr AC/DC In The Studio: Recording Info Insights (Update!)

UPDATE: Our friend and member Currentpeak has just found this superb interview in audio form where Powerage sound engineer Opitz describes how Angus recorded the album back then.

This is Currentpeak‘s understanding, I am posting his comment as a whole:


It is a Michael Butler’s (of Rock ‘n’ Roll Geek Show) interview with Mark Opitz. As we know, he was an audio engineer/mixer/producer for many Albert Productions’ artists including AC/DC, The Angels, Rose Tattoo = real rock royalty! (more…)

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22 Apr Breaking News: The Vega “Right” Settings with Input Impedance @ 50kohm

Well well well… I’m so ecstatic. I thought I couldn’t be any more than this, but I am.

As anticipated here, yesterday at the lab we went back to what we know of the original specifications of the Schaffer Vega. It clearly stated – thank God – that the input impedance of the transmitter was 50kohm (basically, right after the input jack there is a resistance inside the transmitter box).

[singlepic id=445 w=1024 h=768 float=]

Original Schaffer Vega Specifications (transmitter/receiver) (more…)

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