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Old 19th May 2013, 11:02 PM   #1
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Default 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.

Thanks
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Old 19th May 2013, 11:09 PM   #2
kevinkr is offline kevinkr  United States
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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..
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Old 19th May 2013, 11:10 PM   #3
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Yes I guess it would be considered a studio processor.

Thanks!
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Old 19th May 2013, 11:13 PM   #4
kevinkr is offline kevinkr  United States
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Ok, I'll move it to Instruments and Amps as it is more likely to get attention there..
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Old 20th May 2013, 03:22 PM   #5
JMFahey is offline JMFahey  Argentina
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Quote:
changing all of the transistors to germanium
What do you think you will achieve with that?
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Old 20th May 2013, 03:56 PM   #6
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I was thinking it might make a slightly darker and dirtier sound. Mainly I want to do the bass boost switch though.
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Old 21st May 2013, 03:40 AM   #7
JMFahey is offline JMFahey  Argentina
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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.
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Old 21st May 2013, 03:44 AM   #8
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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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