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Old 15th April 2013, 07:13 AM   #11
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I have spare BG ordered.

For C13 I have recommended russian caps.

OK, I ll try to use recommended parts first and build upon them

Dario, in C101 what is a minimum voltage rating ? Some Mlytic AG rated 40V. What is a margin ?
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Old 15th April 2013, 09:16 AM   #12
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Right.. voltage drop after transformer (rectification ?) is approx 34 V which seems to be too close to 40V specs of capacitor, so 63 V cap is the choice if I cannot find 50V specified.
Plus I must add into equation voltage forward drop of rectifying diodes ?

Or because they connected in parallel total V equals 0 ? And only rectified voltage of 34 V is going through ?
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Old 15th April 2013, 12:01 PM   #13
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Right.. voltage drop after transformer (rectification ?) is approx 34 V which seems to be too close to 40V specs of capacitor, .....................
That's not close. You have 6V to spare for transient spikes.

But more importantly have you measured the open circuit voltage of the transformer?
Have you then scaled that output voltage to what would appear when mains is at maximum tolerance of 254Vac?

Do that first.
Then model the smoothing cap voltage.
Finally select a capacitor voltage rating to suit.
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Old 15th April 2013, 12:04 PM   #14
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Thx, will read into it.

I am torn on my day off between youtube videos, all about circuit DC part book
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Old 15th April 2013, 10:59 PM   #15
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Found answer..they fine

Dario, I remember you were cautious about Nichicon KG, but I might get them cheaper so would give them a try (if you are not against that decision )
Plus according humble cap test Jantzen superior Z is nice one to try, especially considering price, what do you think about that one ?
@Tom E,

Do I remember that you played with the Jantzen Superior Z and reported on another thread? If so, how did you use them and what did you think? Of course, my memory is not my strong suit, so I may be remembering someone else's comments.

Jac
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Old 16th April 2013, 01:50 PM   #16
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Today contacted a local manufacturer and ordered a couple of toroids 250 VA 2x21V (for there are plans to use the amplifier with a 4 Ohm load).
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Old 26th April 2013, 07:48 PM   #17
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Confused. Is there any difference between Audyn true copper blue or bronze coloured caps ?
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Old 26th April 2013, 08:41 PM   #18
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Confused. Is there any difference between Audyn true copper blue or bronze coloured caps ?
Build date at least. Tom E., Bob, and Dario all bought the blue ones in 2012 or earlier. I auditioned Bob's blue one and it sounded nice. I believe the blue ones have a paper or foil wrapper.

For a different project, I purchased a pair of the bronze ones late last year. It appears that the wrapper for these is rather thick aluminum foil that has a brushed and anodized finish. This appears to be a style change for Audyn, but I don't know if it affects sound. Actually, I prefer the look of the blue because the bronze has an uneven and thick junction of the foil that looks cheap.

Unfortunately, I don't have the other project complete, so I can't comment on the sound. Also, they are a different value than usable for C13, so I couldn't try them in direct comparison to other caps.

Has anyone else tried the bronze TCs in C13? Especially with some other comparison of caps?

Jac
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Old 26th April 2013, 08:45 PM   #19
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Here is a picture of the bronze TC. This one is 0.1 uF.

http://www.diyaudio.com/forums/attac...1&d=1367009085
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Old 27th April 2013, 05:18 AM   #20
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Understood, thank you.

I remember Dario suggested getting soldering pot for them. Has anybody tried just to rub off the coating ?
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