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In Reply to: RE: III. Output Stage posted by SteveBrown on December 09, 2014 at 04:15:39
Steve,
Solen Film Caps are pretty dreadful audio performers, and only seem to be used because they are inexpensive versus others.
I suggest you look at the new breed of film caps, called DC LINK, applying the latest film cap technology, with a wide choice in voltages ( 600, 800, 1200 VDCs ) and uFs. Look up papers on them, compare specs. The ones we have audio tested are made by WIMA, available here in the USA, and there is also another line, made by VISHAY, and maybe one or two other Manufacturers.
Say " Goodnight Gracie "...... Say " Goodnight Blackgate WKZ ".
Jeff Medwin
Follow Ups:
There is some listening experience to suggest that Solens take a long time to break in, but sound pretty good once that is done. Like 200-300 hours? There is not yet enough data to say anything definitively, just an interesting observation at this point. At least it's actual listening, no theory at all!
Hello Drlowmu,
First a word to the Hall Monitors: Please forgive me if I am breaking protocol. I just need to post here and now.
I am following the generous thoughts of Paul Joppa on building his version of a DC 2A3 amp which I plan on building. Thanks a million Mr. Joppa.
I am now using a Uchida 2A3 clone amp the Bowei 2A3. I was going to upgrade the PS caps with solen 47uf 630v cap, but then I saw your suggestion of DC Link caps for ps filtering. Are these the ones?: http://www.mouser.com/ProductDetail/Vishay/MKP1848S65050JY5F/?qs=sGAEpiMZZMv1cc3ydrPrF2iz%2f2bi%2fpr6ughQJim8hsQ%3d
So far I've changed the coupling caps to Russian PIOs and I'm using JJ2A3s and GE6SN7s. I'd like to improve this amp some more without tearing it apart, so if you have any suggestions on improving this amp I'd appreciate it.
Regards,
David
PS. I'm still drinking Steve Bauer's veggie juice and I feel no pain in my joints. Thanks for that again. Do you have a recipe for just plain old muscle pain?
Go with the WIMA DC Links, not VISHAYS.
Readily available.
Jeff Medwin
WIMA DC-LINK MKP4 or 5 or 6? Or what?
Observe, before you think. Think before you open your yap. Act on the basis of experience.
Hi Jeff,You've been giving us some good advice. I appreciate it. How many men can get PJ to amend his circuit?
I found at Mouser:
WIMA
50uf 600v $25
50uf 800v $25
100uf 600v $43
100uf 800v $45You get ten 100uf 600v for $395. Call it $400.
$43 is a boutique cap price. Clarity Cap same value, and maybe $7 bucks more, or maybe the CC isn't such a boutique price after all.
I've liked WIMAs for a long time, but I've only heard them as coupling caps. I always thought they would excell in the PS. They are perfectly good coupling caps, and what more can you say? I have a bag of .22uf 600v ones.
Would you use them in C1 position instead of a good PIO or Film in Oil? I think I would like to use the wima in the ultrapath position.
Jamie
Big speakers and little amps blew my mind!
Edits: 12/11/14
Panasonics run about $15 for DC link.
No audio experience here, just a Scots connection ...
Panasonic DC Link at Mouser
100uf 500v 4 pin $21
Ten for $200. That's half the price of the WIMAs. Not too shabby.
Do all 4 pins have to be connected?
Big speakers and little amps blew my mind!
Here are some Scotch caps for ya.
Russian electrolytic 100uf 350v caps. 10 for $15.
Are the connectors a pain?
Big speakers and little amps blew my mind!
Just build an isolated bracket for mounting unless you use your chassis as ground which is an art to itself..it would be cool to hear them...
Stuben
Good point.
If the connectors work in your application they are fine. I would try and find out when they were made though as they are electrolytic.
Although if you are trying to achieve a specific grounding scheme, these may limit you as they will be grounded to the chassis at their particular locations.
Aside from that, what's not to like, simple and easy installation and only one wire to connect.
The safest suggestion I have already made, was to use WIMAs, as they HAVE been sonically evaluated and determined to be superb !!
Cheaper DC LINK stuff, have NOT yet been sonically evaluated, and so, those cheaper ones may be more expensive !! :-)
I use the higher VDC rated caps, 800 or 900 VDC as I recall, and use in the C1 position ... it is fine !!
Jeff Medwin
My last name is Scottish, and I save my money.
Thanks for the great tip PJ!
Big speakers and little amps blew my mind!
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