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Old 23rd March 2009, 12:30 AM   #541
cyxg is offline cyxg  Australia
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Default Re: Black Gate Capacitors!

Quote:
Originally posted by lanchile07
mubeen, if I may contribute in something.I used the "premium parts" too, but I was like you.I was trying to get the most of these amps.so I decided to change the capacitors from Panasonic capacitors 1500uf (premium kit) to "Black Gate" capacitors 1000uf 50v.
The result was a huge improvement!,of course these caps cost a lot,but it was worthy all the way!.Some people do not hear a difference ,but I did an A/B test with Black Gate capacitors and they are the BIG improvement that you are looking for. Remember to let the capacitors "run" for at least a month or so.
Good Luck buddy!

I think so.
Black Gate is my choice.
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Old 23rd March 2009, 05:32 AM   #542
ppapcro is offline ppapcro  Canada
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Hi Peter

Quote:
If you run separate PS, there is no need to connect both channel grounds as in Patek amp; run them separately all the way. Here's an example of such amp.
What was the example you referred to? It didn't show up.
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Old 23rd March 2009, 01:36 PM   #543
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Hi Peter,

A quick question. I've been running my amp in "test mode" for about a week now, meaning I have no lid on the chassis and I'm still waiting on heat sinks to complete the box. I've been operating the unit without heat-sinks but in good ventilation, and it works but if i turn the volume up too high, one or both of the channels cuts out completely. Is this clipping, or overheating? There's no distortion, just a cut-out that returns to normal after a few seconds, usually when I pull back on the volume a few clicks. Will heat sinks resolve this or is this the sharp clipping that I saw on the transformer voltages diagram when reaching a certain volume?

Many thanks
Lucas
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Old 23rd March 2009, 01:38 PM   #544
AndrewT is offline AndrewT  Scotland
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Hi Lucas,
this is neither clipping nor overheating.
This is plain and simple operator abuse.

GET THE HEATSINKS FITTED!!!
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Old 23rd March 2009, 02:04 PM   #545
Vautrin is offline Vautrin  United States
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Peter,

Although I'm entirely happy with my current build, I'm curious to know what effects other capacitors might yield. For example, would Elna 1,000uf / 50v Silmics work in place of the Panasonic 1,500uf caps? Are there other substitutions you'd recommend trying? What value ranges are compatible (uf and v)? Or should I leave well-enough alone? (All I need is the slightest reason to order another kit, heh). Thanks!

David Barnett
SW Florida
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Old 23rd March 2009, 02:05 PM   #546
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It's overheating! Haha! Heatsink fitted - problem solved...thanks.

Lucas
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Old 23rd March 2009, 02:33 PM   #547
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Quote:
Originally posted by ppapcro
What was the example you referred to? It didn't show up.
Here it is: The most advanced GainClone amp yet


Quote:
Originally posted by Vautrin
Although I'm entirely happy with my current build, I'm curious to know what effects other capacitors might yield. For example, would Elna 1,000uf / 50v Silmics work in place of the Panasonic 1,500uf caps? Are there other substitutions you'd recommend trying? What value ranges are compatible (uf and v)? Or should I leave well-enough alone? (All I need is the slightest reason to order another kit, heh). Thanks!
Florida
I didn't try Silmics with those amps, and Panasonic FCs were the second choice after BGs:

http://www.diyaudio.com/forums/showt...431#post574431

http://www.diyaudio.com/forums/showt...230#post581230
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Old 24th March 2009, 12:33 AM   #548
ppapcro is offline ppapcro  Canada
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Thanks Peter, that's exactly what I meant. So, separate all the way. In this layout, with no common ground point, is there still a way to tie each board's signal ground to the chassis for shielding
purposes? A separate wire from each amp board OG to same point on chassis?
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Old 24th March 2009, 08:37 AM   #549
AndrewT is offline AndrewT  Scotland
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A small ceramic cap in parallel to the disconnecting network achieves the HF coupling that is required for interference screening.

A ceramic cap from RCA barrel (return/ground) to the Chassis may achieve the same suppression.
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Old 25th March 2009, 08:47 PM   #550
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I've just finished preliminary project with Peter's boards.Everything is still on wooden board with no chassis.I've built dual mono bi-amp amplifier.On bass there's 2200uF Pana FC,on treble 100uF BG standard.I have a couple of questions.

About grounding.Do I have to connect every ground point on boards(SG,PG,OG,CHG...) in one point?I'm trying to built separate PS.

About pot.When I first tried amp with only two boards(simple stereo) 50k pot was ok.But now when i have two boards in parallel(on each channel) it's seems to much.I need to turn pot for about 70% to be very loud.I can turn it to 100% and listen(very,very loud),but I don't think that's 4x55W.For instance I've listened my other amp rated 45W at 8 ohms with 50k pot too,but I can't listen after 70% pot turn.It's too loud for me.What should I do?

Sorry if my English is not so good :-)
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