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Old 28th February 2010   #963
ChampionAudio
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Joined: Feb 2010
Location: Minneapolis, MN
Posts: 85

DIY Pre73 mods

Hello fellow Slutz!

I'm new here, so for my first post...

I've been reading for months, and this forum is such an amazing source of knowledge and experience that it's taken me this long to come up with a question I couldn't find an answer for. I've read the Pre73 threads till my vision goes blurry, so I hope my question isn't answered somewhere in the depths.

I'm looking to expand my gear selection to make my ITB setup a little less sterile, and I've settled on the Pre73. My dilemma, however, is that there's no way I can afford Warren's full upgrade mod at the moment, and I have a project that I need it for ASAP. To my ears the mod makes a HUGE difference, and after hearing about possible biasing errors on the stock transistors, I was sold (but without the necessary fundage)

My question is, what are the correct capacitor values, and how many are needed? Also, is there a reliable source out there to get the Motorola transistors or a modern equivalent? What do I need to know for biasing? The transformers will be fairly straightforward once I get them shipped from the UK. I have some soldering skill, and a bench tech friend who will do it for a 6 pack of good Belgian Ale if I have all the parts and info ready for him.thumbsup

Any insights are appreciated!
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If you engage the "Suck Button" on a (insert name of cheap gear-bashing fodder here) and no one can hear a difference through the noise floor and crosstalk, does it still make a sound?

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