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Old 15th January 2008, 11:35 AM   #1
WE91 is offline WE91  Norway
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Default Looking for comments on Welborne Labs PS10 reg. HT supply

Hello folks.

I plan on using the Welborne-labs PS10 (all polyprop.) regulated supply for a SE 300B output-stage ...

Does anyone have comments?
See it here:
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Old 15th January 2008, 11:45 AM   #2
Colt45 is offline Colt45  Serbia
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Unless you need it to outsurvive you, and nuclear war, I wouldn't bother with polyprop caps, unless you've got cash to burn.

Don't short the output.. the fet will smoke!
well, unless those resistors upstream limit current to a reasonable value.
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Old 15th January 2008, 11:59 AM   #3
WE91 is offline WE91  Norway
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Thank you, Colt 45.
- So you don't think the polyprop's have any influence on the final sonics of the amp?
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Old 15th January 2008, 01:20 PM   #4
Stixx is offline Stixx  Germany
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Quote:
- So you don't think the polyprop's have any influence on the final sonics of the amp?
It probably depends on the influence of the psu...
in a SET amp this would be pretty much the case, and though my own experience with pp caps in the psu is a spud headphone amp only (using the C3G), it was clearly audible...to the better.

A regulated supply is a different beast I can't comment on...sonic impact is likely lower so using pp caps would indeed be just an issue of longevity.
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Old 15th January 2008, 04:56 PM   #5
kevinkr is offline kevinkr  United States
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I've been designing and building regulated supplies for my SET amplifiers for about 15yrs now and generally use PP or PPIO in my supplies. I tend to keep things long enough that electrolytics wear out, and with careful shopping non exotic motor runs or Solen polyprops can be acquired for little more money than a good electrolytic, and in some cases far less.

I too have observed a positive impact on the sound quality when using PP over electrolytics, although in good regulated designs the difference is pretty subtle.

Also you can fairly easily design and build your own regulated supplies instead of buying this kit.
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Old 15th January 2008, 05:16 PM   #6
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Default Re: Looking for comments on Welborne Labs PS10 reg. HT supply

Quote:
Originally posted by WE91
Hello folks.

I plan on using the Welborne-labs PS10 (all polyprop.) regulated supply for a SE 300B output-stage ...

Does anyone have comments?

Quote:
Originally posted by Colt45
Unless you need it to outsurvive you
This particular supply is not likely to out-survive you a) because it has a tendency to become unstable and burn itself up, and b) because you are unlikely to get anything you buy from Welborne actually shipped to you.

That said, in a single ended design, unless you go to great lengths to prevent it, the power supply is part of the signal path. Polyprops make a big difference. Also, the schematic and parts list for that particular supply is attached to a thread somewhere around here -- search for it.
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Old 15th January 2008, 05:55 PM   #7
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Default Re: Re: Looking for comments on Welborne Labs PS10 reg. HT supply

Quote:
his particular supply is not likely to out-survive you a) because it has a tendency to become unstable and burn itself up, and b) because you are unlikely to get anything you buy from Welborne actually shipped to you.

lol

i have heard the same about those supplies, there is a thread somewhere with pics of the damage
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Old 15th January 2008, 07:13 PM   #8
Stixx is offline Stixx  Germany
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Quote:
Also, the schematic and parts list for that particular supply is attached to a thread somewhere around here
Yup, look here: thread
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Old 15th January 2008, 08:47 PM   #9
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Default Re: Looking for comments on Welborne Labs PS10 reg. HT supply

Quote:
Originally posted by WE91
Hello folks.

I plan on using the Welborne-labs PS10 (all polyprop.) regulated supply for a SE 300B output-stage ...

Does anyone have comments?
See it here:

Heatsink is of a forced-air type (too narrow gaps between fins for convection), but an air flow path is closed by capacitors. Odd aluminium, odd weight, odd size for given performances.
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Old 15th January 2008, 09:39 PM   #10
Jeb-D. is offline Jeb-D.  United States
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Don't buy from Welborne Labs!
http://www.diyaudio.com/forums/showt...99#post1401599

Many people have had similar experiences.
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