Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Return to Tube DIY Asylum

Message Sort: Post Order or Asylum Reverse Threaded

Morrison Micro Power Supply

100.40.163.12
Posted on February 24, 2015 at 17:10:09
wclarson12
Audiophile

Posts: 30
Location: Hudson Valley NY
Joined: April 10, 2014
 The schematic calls for a 750vct tranny, and then a pi filter with a 10 hry choke. Certainly not fashionable and low dcr.
I have these parts.
I also have a formidable 900vct tranny and a boat anchor 3.3 hry choke, about 27 ohm dcr for choke input.
I'm not sure how to finish this supply.
Thought maybe split into two rails with a 2 smaller chokes like the Dyna c-354 (where I have one) and caps of course.
We also have the "flywheel" arrangement and various offspring.
Could use some sensible ideas on how to proceed.
Thanks

 

Hide full thread outline!
    ...
RE: Morrison Micro Power Supply, posted on February 24, 2015 at 17:46:36
Paul Joppa
Industry Professional

Posts: 7296
Location: Seattle, WA
Joined: April 23, 2001
 Since you are following a well-developed design, I say stick with it. You can try a different design later if you want to know the difference. If you must change the design to something new, you should not call it by its original name - it is not the same and won't sound the same. The power supply is important; changing it changes the amplifier.

In my humble opinion, the power supply variations that occupy 90% of the space on this forum are the obsession of a very few people who post frequently - they are NOT the consensus of experienced designers. The low DCR designs are talked of in the context of a specific SET design which is very different from widespread practice, and thus very different from the Morrison design. Those power supply designs may have some utility in the context of those SETs, but are much closer to irrelevance with accepted SET design practice - such as the Morrison.

 

RE: Morrison Micro Power Supply, posted on February 25, 2015 at 05:15:35
larrymoore@ultrafi.biz
 Why don't you build it as described? And, go from there??

The 900 vet tranny will result in too much B+ unless you choke load it, meeting critical inductance, and you'll likely have to add some capacitance after the rectifier to boost the voltage up a bit.

To me, the best choice would be to substitute the 3.3H for the 10H choke.

I'd forget about the split arrangement.

HTH

 

Very Good (nt) , posted on February 25, 2015 at 06:21:42
drlowmu
Manufacturer

Posts: 9730
Location: East of Kansas City
Joined: January 10, 2005
 .

 

AMEN (nt), posted on February 25, 2015 at 07:59:11
danlaudionut
Audiophile

Posts: 5480
Location: Schenectady
Joined: June 6, 2002
 DanL



 

Page processed in 0.021 seconds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]