Recommended Modifications/Tweaks for Dynaco PAS-3 Series II Pre-Amp - diyAudio
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Old 30th May 2005, 06:14 AM   #1
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Lightbulb Recommended Modifications/Tweaks for Dynaco PAS-3 Series II Pre-Amp


a friend is asking me what are some modifications/improvements/tweaks that can be done for a Dynaco PAS-3 series II tube uses 3 pieces 12ax7 tubes in the line stage stage as well as 3 12ax7 tubes in the phono stage...any website that you can recommend?

many thanks to all!

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Old 30th May 2005, 01:49 PM   #2
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Norman Koren has done some good work sorting out the feedback and coupling issues of the older Dyna preamps:

I'm not sure how much of this applies to the Series II, but worth a look.
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Old 31st May 2005, 06:00 AM   #3
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Default Norman Koren 2nd yes vote

It amount to almost a total rebuild but the circuit confuguration is a serious winner, used by Hovland, Pultec and Groovetubes.

Have at it and enjoy!

Robert Morin
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Old 17th January 2006, 09:40 AM   #4
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Default pas3 bass & treble

Hello !

I don't want to totally rebuild my pas3. All i want is to change the pot into a commercial value, because 700k & 400k are nowhere to find. what shall i do without changing the circuit?
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Old 20th October 2010, 08:44 AM   #5
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A certain forum member is an authorized reseller of the Koren boards too

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