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Old 18th February 2013, 11:56 PM   #11
Loren42 is offline Loren42  United States
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Using modern day solid state rectifiers has a real advantage for relieving stress on the power transformer. The issue is the filaments of the tubes exceed the transformer's ratings.

The 12X4 alone draws something like 300 mA (as measured on my PAS 3). The power indicator bulb draws another 83 mA.

Getting rid of the 12X4 will essentially fix the over current issue.

Modern day solid state rectifiers are quiet enough now that you can go that route with confidence.

On the downside, you can end up pumping a lot work into the PAS to fix all the shortcomings and there are many. By the time you are done you could easily have invested that same money in building a superior DIY preamp.

The is the road I am now taking and I am doing as little to the PAS as possible while I scratch build something else.

There are a number of places that offer replacement boards and upgrades. Just search using the terms "PAS 3 Rebuild" and you will get an idea of what is out there.

You probably should check out prices for all the parts and see where it takes you.

Lastly, many might disagree, but it is far more economical to build a solid state preamp and you will get superior performance compared to a tube amp version.

Building a tube power amp makes far more sense than a tube preamp unless you are simply looking for a bigger challenge than a solid state design - and you will get just that.
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Old 19th February 2013, 12:30 AM   #12
PW47 is offline PW47  United States
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thanks very much for the input ,iwill check out ,so is recomended to change the power indicator bulb also ? there is bulbs that draws less ma in the market ? regards p.wilson
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Old 19th February 2013, 12:53 AM   #13
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I made that pas3 many years ago and use the Dogstar hifi stand-alone preamp power supply config and indeed has a superb performance.
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Old 19th February 2013, 02:10 AM   #14
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For a 'new' supply for the PAS, try:
Classic Valve Design - Dynaco Clone and Original Design Boards
For an LED upgrade for the PAS, try:
Classic Valve Design - Dynaco Clone and Original Design Boards
Gregg is a good guy to deal with.
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Old 19th February 2013, 10:59 AM   #15
Loren42 is offline Loren42  United States
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Quote:
Originally Posted by PW47 View Post
thanks very much for the input ,iwill check out ,so is recomended to change the power indicator bulb also ? there is bulbs that draws less ma in the market ? regards p.wilson
Yes, replace the bulb with an LED. See Prairieboy's post.

However, 83 mA is small change compared to 300 mA for the heaters of the 12X4 rectifier tube.
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Old 5th March 2013, 02:35 AM   #16
PW47 is offline PW47  United States
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THANKS RY MUCH LOREN IAPRECIATED YOUR HELP ,SNICE TIPS TO BE FOLLOW , BEST PWILSON
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