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In Reply to: RE: Power Supply Cap posted by Mr_Steady on December 07, 2014 at 15:07:36
I think, someone correct me on this if I am mistaken, that those two 100uF capacitors are actually seen as one 50uF capacitor with double the voltage rating of the lowest rated capacitor, in this case the lower rated cap is 250v, effectively making it a 500V rated cap to be a little higher then the 450V B+
Someone else will have to comment on whether these should be oil capacitors or not.
I myself am running out of room!
Follow Ups:
GargOyle,
No need for correction
http://farside.ph.utexas.edu/teaching/302l/lectures/node46.html
As I've mentioned before, the big oil caps are very good for the money. If prototyping, use em...unless you just don't have the space..
I personally have learned to totally dislike the sound of electrolytics in the PS (like a wet blanket draped over the speakers) ...with that said, much of this opinion has resulted from dealing with old commercial stuff that used cheap caps to start. I'm sure that there are some nice sounding electrolytics out there for the C1 position but they are almost certainly pricey compared to the big oil caps...
Stuben
OK Stuben, that sounds like a reasonable enough experience for me to maybe pursue the film cap route.
(Just to clarify, those little chassis mount Mr. Steady linked earlier were Electrolytic.)
My chassis is 12"x9"x2" so it will be a little tight.
Cheers.
"I myself am running out of room!"
Don't laugh, and I'll probably get flamed.
I've been collecting cigar boxes for a while as possible enclosures. I think I will do two for each monoblock. A power supply box, and the main box, connected by an umbilical cord. I think I will hard wire the umbilical.
Just playing,
Jamie
Big speakers and little amps blew my mind!
Parts Connection does have a nice selection.
I think cigar boxes would look very nice, although I'm not crazy about the all wooden box thing, it is something I have contemplated many times.
Ideally they would have a metal lining with the wood box around it, which is a little tougher in your case as you already have the finished boxes.
It's doable, just more a little more work, but hey that's part of the fun.
You might be able to get some of those Hammond chassis to fit from Parts Connection, as long as it works for the layout, IMO it wouldn't matter if the wooden box was a little bigger.
Yes, I thought about lining the boxes. I think diyhfsply has copper shielding. BH doesn't line their wood boxes, but I think they shield the signal wire instead.
After reading Paul's explanations, I decided to build it stock with the 5v4s, no modifications.
I think the Hammond OPTs might work well for me, because I would only use this amp in a very limited bandwidth, like 300hz to 1,800hz.
I want to give this a crack, but I'll go slow.
Jamie
Big speakers and little amps blew my mind!
"BH doesn't line their wood boxes, but I think they shield the signal wire instead."
Those amps do have a metal top plate to hold the parts together, maybe you could fit something like that to the underside of your cigar boxes, then use the shielding tape if necessary.
That way you won't have a problem if the cigar box splits it's lid etc.
Anyhow I'm just making suggestions, I'm sure you know what you are doing.
"Anyhow I'm just making suggestions, I'm sure you know what you are doing."
Not so much.
One step up from a bread board is what I'm looking for. I figure using two boxes (PS-main amp) will split the weight load. Maybe even mount the OPT inside the box.
Big speakers and little amps blew my mind!
47uf 600v Sonicaps were at parts connexion for $15.
Big speakers and little amps blew my mind!
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