Dynaco PAS Preamp - Complete Rebuild - diyAudio
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Old 28th February 2011, 05:33 PM   #1
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Default Dynaco PAS Preamp - Complete Rebuild

Finally finished up my PAS rebuild, it's been months coming. I chose to use reproductions of the original PAS 3 boards from eBay and rather than recreate the selenium rectifier with standard capacitors, I used the ClassicValve PAS Regulated Power Supply. I/O board and RCAs were sourced from Tubes4HiFi, Transformer from TriodeElectronics, Elma switch from PercyAudio, Alps pots from Mouser, resistors and caps from Sonicraft, etc. etc.

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Be sure to check out all the build notes here: DIY Audio Electronics from Zynsonix.com: Complete Restoration of a Dynaco PAS Pre Amp
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Old 28th February 2011, 08:05 PM   #2
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Congratulations - that looks like a nice job.

It's good to see kit like this lovingly restored, especially valve kit.

I repaired CRT TV's for 15 years, and developed a healthy respect for the high voltages, but even so I'm still intimidated by valves!

Does it sound as good as you had hoped?
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Old 28th February 2011, 08:54 PM   #3
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Not much left from the original!
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Old 28th February 2011, 09:05 PM   #4
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Thanks It sounds surprisingly nice for such a simple circuit. It's probably not the last word in detail, but if that were my objective I would have likely started elsewhere

I've sure you've been on the receiving end of a zap from a CRT tube Tony. I've had the experience once and it's not something I would like to reproduce . I take good precaution when testing things these days. This little bugger has a little over 300V that it can zap you with.

The only bits left of the original are the chassis, a few of the screws... and that's about it. I did find a generous guy on AudioAsylum who sold me a pair of blend switches for a few bucks. One was a little worse for wear, but I was able to make use of the other one. I was able to find new owners for the old boards, strange plexi RCA boards and front panel.
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