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Old 17th December 2002, 01:19 PM   #16
protos is offline protos  Greece
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I had similar impression of a slight lack of bass dynamics and speed/snap at first. Things got better after a long break in period. I also noticed an increase in dynamics after bypassing the power supply caps with 2,2uf film and 0.1uf film foil high quality Audyn caps. Maybe the big caps are sluggish . Make sure there are no bottlenecks in your mains supply. I have a heavy gauge dedicated connection to the main board.
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Old 17th December 2002, 03:29 PM   #17
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Hello all,
thanks for your support.
I've unbalanced the current gain of the two halves (the CCS gain is about 60% of the "total" amount) and the bass impact came out more easily, the sound with my speakers seems to be more vital, or at least it seems to me.
The amplifiers are about 40-50 hours burned-in, so I expect further improving in sound.
I'll try main PSU capacitors' bypass, and above all a balanced preamplifier wiring.
Thanks again.
Marcello
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Old 17th December 2002, 05:09 PM   #18
JDeV is offline JDeV  South Africa
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Default Same for Aleph30??

Quote:
Originally posted by Nelson Pass


Did I fail to mention even more capacitance in the supply?

1. Will this have same effect for Aleph30?
2. Can there be - too much capacitance?
3. How much will become - too much?

Thanx.
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Old 17th December 2002, 06:35 PM   #19
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Marcello,

the effect was the same in my setup so your ears don´t deceive you

JDeV,

1. yes
2. yes
3. if your transformer melts at startup it is time to reduce capacitance.

william
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Old 17th December 2002, 06:43 PM   #20
JDeV is offline JDeV  South Africa
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Quote:
Originally posted by wuffwaff


"3. How much will become - too much?"
3. if your transformer melts at startup it is time to reduce capacitance.

william
Sorry for sidetracking the thread, just 1 last Q:
How can I calculate safe maximum capacitance on powersupply?

Thanx again.
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Old 17th December 2002, 07:02 PM   #21
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JdeV,

don´t really think there´s an upper limit exept for the space you will be needing and the law of diminishing returns concerning ripple voltage.

I would always use a pi filter for a class A amp and look for a ripple under 50mV or so (use PSU designer!). I´ve managed 7mV in my Aleph 5 with 220000uF and 1.8mH (80000-1.8-132000).

william
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Old 1st January 2003, 10:43 AM   #22
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Quote:
Originally posted by wuffwaff
JdeV,

I would always use a pi filter for a class A amp and look for a ripple under 50mV or so (use PSU designer!). I´ve managed 7mV in my Aleph 5 with 220000uF and 1.8mH (80000-1.8-132000).
Hi william,
did you hear an improvement in soundquality when the ripple decreases ? what for coils are you using in your amp?
thanx
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Old 2nd January 2003, 05:21 AM   #23
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Quote:
Originally posted by JDeV
How can I calculate safe maximum capacitance on powersupply?
Look at the balance of your checking account and divide
by the unit price of the capacitors.
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Old 2nd January 2003, 07:22 AM   #24
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Smithers,

I use Intertechnik air cores. 1,8mH /0,38 Ohm. Never tested the amp without them so I can´t comment on sound quality differences. What I can say is that the amp is very quiet.

william
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Old 2nd January 2003, 09:10 AM   #25
Nicwix is offline Nicwix  Australia
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Quote:
Originally posted by Nelson Pass

Look at the balance of your checking account and divide
by the unit price of the capacitors.
Carefully applying this formula, I end up with negative capacitance ...

LALALOL

Nic
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Old 2nd January 2003, 11:01 AM   #26
protos is offline protos  Greece
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Tortello,

Please try the balanced connection to the Alephs. I just tried it with my new BOSOZ and it totally blew me away compared to unbalanced operation. Everything sounded better including the bass.
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Old 2nd January 2003, 11:11 AM   #27
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Quote:
Originally posted by wuffwaff
Smithers,

I use Intertechnik air cores. 1,8mH /0,38 Ohm. Never tested the amp without them so I can´t comment on sound quality differences. What I can say is that the amp is very quiet.

william
I thought you were using torobars
Anyone tried these inductors?
But I read that is for the X.

Are the torobars more suitable for a pi filter??
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Old 2nd January 2003, 03:14 PM   #28
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Duck,

not more suited but 0,4 Ohm and 10A bias don´t go togheter well

william
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Old 4th January 2003, 03:19 PM   #29
Bobken is offline Bobken  United Kingdom
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Quote:
Originally posted by wuffwaff
[B]Marcello,

I´ve used black gates for all the 220uF Caps. Before that I used panasonic FC (for about 10-20 hours). The difference after putting those Black Gates in was not really noticable.
I think I must put those Panasonic back in some time cause the amp has changed quite a lot over the first 200 hours or so and I still think it´s getting better and better ( in the bass, but also the highs wich were very slightly forwards in the beginning).
I don´t know if it´s caused by the Black Gates or if it is just the normal (long) process of running in.


I still think it´s the most revealing amp I´ve ever had in my system and it really let´s you hear small differences in upstream components.

william
Ah!! Another typical case of Black Gates taking an age to burn-in, as I have elaborated in some other posts on BGs recently.

If I may give some advice, never judge a BG too soon, as I have realised that it can take at least 3 months to 'idle', as Jelmax says, before they are at their best, and maybe longer. It is well worth the wait, though, if you can only be a little patient!

Its real a pain in the proverbial, I well know, but it is still true!

I would very much like to hear from you *after* you have replaced them with the 'old' Panasonics, and whether the amp still sounds as good then. That will be the real test, and it will be fair in that both sets of caps will have been used for a while and they will have burned-in fully. (Panasonics have a much lesser, and easier to live-with, burn-in time, and they still sound quite good during this process)

If I was a betting man, I know which I would put my money on, in spite of what Lord Nelson says. Perhaps, also, he is not as patient as me, although unlike DIYers, of course, such a ridiculous burn-in time must be hopeless in manufacturing audio gear.

I believe far too many people discard (or prematurely judge) BGs after a fairly short trial, out of impatience, as they sound awful for a few days after they are first installed. (Also see my other posts, on this, if you are interested, as I very nearly made this same mistake myself, and it is well worth reading what Jonathan Carr has said elsewhere.)

Most trials, in my experience, are carried out by comparing *new* BGs with *old* existing electrolytics, when there will be little or no real subjective benefits apparent, possibly for several weeks, with the full potential not being realised for many months.

I have carried out extensive 'listening' tests between (properly burned-in) BGs and all the usually-touted electrolytics (also burned-in) and there is not one other which comes close.

I have switched them to and fro several times, in succession, and no Panasonic I have come accross is a match for BGs., of which the non-polar (and unfortunately even more expensive!) N, NX, & NX HiQ series, are the best.

I have no connection with BG except that they have nearly bankrupted me with their obscene prices, which is another matter!

Regards,
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