Quad 33 Regulated Power Supply

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08-Jun-2017 05:57 PM

Pieronip

Pieronip

Posts: 3

Hi

I would like to try a regulated supply on my Q33.  Will the transformer supply enough voltage at the required current to allow regulation to a 16v DC supply?  I gather there was a blog post about it but since the blog doesn't seem to be searchable, it is hard to find.

Many thanks.
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09-Jun-2017 08:36 AM

Joost Plugge

Joost Plugge

Posts: 943

The blog post is from August 2007 (10 years old!)

http://quadrevisionspot.blogspot.nl/2007/08/

16 V regulated is a bit to much, but 15v with a so called low drop regulator is possible.

Joost Plugge

DaDa Engineering

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09-Jun-2017 08:44 AM

Pieronip

Pieronip

Posts: 3

Thank for that. I'll try it out.
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09-Jun-2017 04:11 PM

Stefaan

Stefaan

Posts: 563

And, seen the very low power consumption of the 12x NPN transistors and the capacitance in the upgraded design of the 33 power-supply using a regulated power supply would be useless.
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09-Jun-2017 05:27 PM

Pieronip

Pieronip

Posts: 3

Interesting.  So you reckon the PSU noise is as low as it can be.  How about benefits from lowering the supply source impedance?  Nothing to be gained there?
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09-Jun-2017 05:44 PM

Joost Plugge

Joost Plugge

Posts: 943

Stefaan has a point, the improvement, if any, should be compared with the already improved supply. Yes the regulated supply will have lower noise and impedance in comparison with a zener based supply. But if it is noticeable?

Let us share your experience.

Joost Plugge

DaDa Engineering

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27-Jun-2017 03:47 PM

FBatista

FBatista

Posts: 103

I can share my experience.

The main audible benefit of using a regulated PS instead of a Zenner based in a 33 unit with original PCB's, is in the phono preamp board.

Other than this, line input have no audible benefit.

Cheers,

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