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Alexmc1988 19th May 2013 10:02 PM

Golden Age Pre 73
I have a Golden Age Pre 73 Preamp that I would like to do something different with. I have 4 Seven Circle N72s so I have the Neve sound covered. What I am considering doing is upgrading the input and output transformers, changing all of the transistors to germanium, adding a PAD switch, and a "thick" switch(light low end boost). What I would really like is a Chandler Limited Germanium Pre but that's a lot of money and no where near as fun.

I know how to upgrade the Transformers and I think I can figure out the transistors. How would I make a PAD and Low Boost switch? Where would I need to insert those in the circuit?

Also would changing the transistors to germanium make any difference? The only reason I thought I would do that is because that's what the Chandler uses.


kevinkr 19th May 2013 10:09 PM

No clue what this device is.. DI? Guitar effects box? Studio processor? If so this should be moved to the Instruments and Amps or PA forum. Let me know..

Alexmc1988 19th May 2013 10:10 PM

Yes I guess it would be considered a studio processor.


kevinkr 19th May 2013 10:13 PM

Ok, I'll move it to Instruments and Amps as it is more likely to get attention there..

JMFahey 20th May 2013 02:22 PM


changing all of the transistors to germanium
What do you think you will achieve with that?

Alexmc1988 20th May 2013 02:56 PM

I was thinking it might make a slightly darker and dirtier sound. Mainly I want to do the bass boost switch though.

JMFahey 21st May 2013 02:40 AM

It doesn't work that way.

It will either stop working or work in a horrible way, because of the terrible bias mismatch, lack of current gain, current loss, etc.

Plus I doubt you can find many NPN germanium transistors, if any.

Sound is not "in the parts" but "in the design".

You can't just throw some vintage parts there and expect it to sound like a properly designed vintage product.

Alexmc1988 21st May 2013 02:44 AM

Cool, thanks for letting me know! Any advice on the low boost and pad switches? This seems like it should be fairly easy.

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