 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
50.4.168.165
Solen capacitors in the 33uf value @ 630 volts DC are large at 43mm diameter x 58mm long. Anyone know of a manufacture producing a more compact size poly type capacitor?
Follow Ups:
Check the KHG2u2 - KHG100uF
I've been using them for years with great satisfaction.
Now with an fairly even conversion rate it's very favorable.
Mundorf are made by F&T.
You can get them as pulls from other places which are new but taken out of new govt equipment..There are also 35uf at 500vdc but these are 30uf at 600vdc.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Thanks. Mouser does not stock these newer capacitors, but DigiKey has stock. Kermit has a line of capacitors in metalized film that are compact and at competitive prices. The application states DC link and power supply filtering.
As for a fine performing power supply, a simple 30uF to 2.5HY (40 ohm DCR) to 75uf capacitor only drops 6 volts from a load of 260ma to 400ma and the recovery overshoot is less than one volt plus recovers in less than 16ms. Produces only .4 volts AC ripple at 260ma. a first cap of 30uf is rather magic with regard to regulation. Larger first capacitors do not regulate as well.
I was looking at the Mouser site yesterday and IIRC, they do offer some of these caps in usable values. Check again, and you might find something you like there.
-Henry
...I just used some 22uF/630VDC "DC link" caps (metalized polypropylene) to rebuild the PS in some QUAD II amps with great success. Since these caps have a rectangular form factor, they can be arranged in compact stacks.
I realize 22uF isn't 33uF but based on the info in your post, the Solens are giving you ~ 0.39uF/cc while Epcos I used come in ~ 0.72uF/cc or nearly double the density.
FWIW, "DC link" caps are the latest tube HV PS tweak fad although I think Wima, Vishay and Panasonic are the preferred brands in tweak land. All are avail from the usual big sources.
In fact, what does "DC Link" mean?
If they are metallized polypropylene, like so many other capacitors are, why would this type merit a unique name?
Thanks, Steve.
Look up its ESR on the specifications sheet Lew. It PLAYS wide-band.
Jeff Medwin
Who said anything was special about it?
It's a commercial film capacitor that happens to come in sizes and voltage ratings suitable for tube amps.
They are used in DC link applications, inverters, renewable energy etc. These areas require more robust film capacitors.
...with solar and other DC to AC apps going mainstream, there's a need for compact high quality HV caps that are more rugged and longer lasting than the typical electrolytic.Tube audio types have discovered them as viable replacements for electrolytics in a lot of situations...until the audio guru du jour declares them lo-fi. Thus a probable fad in the perfectionist audio world even if they're mainstream in the rest of the power electronics world.
I will check them out.
Audio dudes pretty much ignored D.C. Links until they ran out of Black Gates, which-- in the H.V. sizes, were very good.
A decent cap --"audio professor", also Japanese-- also disappeared.
People were looking around. ASC simply builds caps the wrong way. Solen never did work. Electrolytics-- some are fair, but people kept on looking.
I realized a few years ago that I would run out of Black Gate 47/47uf @ 550 VDC caps, so I bought up a stash of them. I also ordered D.C. Links direct from Germany before you could get them here. I wanted to play with them, but never did. I had enough Black Gates for a while.
Duelund Cast? Sure, why not? Bring me some cash! A forest fire out here wiped out all those caps, Black Gates, D.C. Links, all amps and everything else.
I had a chance to redesign everything, so WIMA D.C. Links got designed-into the new stuff from the start.
Jeff was suspicious, but soon I had new amps running with the D.C. links, and other assorted Tin-Foils as back-ups, and the usual stable of the better Dynamicaps and Mundorf Silver/Oils and Silver/Golds.
This combo was a chance to get things to work, I had reasoned.
The D.C. links (WIMA's) proved to be fast, clean and very wideband for their ratings. They didn't have the WAYYYYYY----BACKKKKKK Soundstaging and WAYYYYY WIDEEEEEE------- Soundstage that Black Gates had, but they were cleaner, faster.
OK! So far, so good! A few Tin Foils, backed-up by the right Dynamicaps, D.C. coupling, (caps only in power supply functions), and I got a linear amp that I really liked. I told Jeff about this, so now all of you have the D.C. Links to think about.
Are these things good enough for audio? After all, they're designed for control circuits-- sure, they are. They've been there all along, we just ignored them. They're a good design, just solder right up to the cases-- the leadouts are crap.... so just use as little of them as possible.
They're a sonic bargain.
---Dennis---
Have a look at the DC Link sizes on mousers. (Panasonic, Wima etc.)
The square shape seems to be an economical use of space.
A 35uF is smaller then the Solen, 50uF is too IIRC.
Post a Followup:
| FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
||||||||||||||
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
