F5 power amplifier - Page 976

merlin2069er · 7th January 2011, 12:29 AM

Quote:

Originally Posted by 6L6

I have a 4U 300mm deep Modu on order. I have conversed with a board member who has used that exact chassis with wonderful results. I hope to have the amp done within a week of it's arrival from Italy.

That's great to hear, I've designed my back panel and working on side panel (heat sink - drill & tap). It's nice that they do that at a reasonable rate.

I've created the panels with front panel express, and export it as a dfx file.

Lerg · 7th January 2011, 01:24 AM

Quote:

Originally Posted by a.wayne

So the Toshiba's for sure are better sounding than the IRFP's......

I would say that it is a safe bet that the Toshiba transistors will sound different. Better is a personal preference, so that is a firm maybe.

EUVL · 7th January 2011, 07:35 AM

Nelson has also treid all 3 types (Tos, IRF, FQA) and posted his opinions here.
Why not search for his comments.

Patrick

flg · 7th January 2011, 11:54 AM

Maybe here?
F5 Listening Impressions & Discussion

Neutrality · 7th January 2011, 03:52 PM

Thinking about PSU size for dual mono F5, what can and cant you do.

I was thinking going for less total capacity but instead focusing on ripple current and low ESR.

Wouldnt a lower total capacity than what pass uses in his PSU, but high ripple current and low ESR be better than a huge total capacity but less ripple current and higher ESR?

Can get some very high ripple 2200 uF 50V 105 C caps, around 2.5-3.5A pr cap. Ten of these pr rail would give you 22000 uF pr rail but 25-35A total ripple current and very low ESR.

Am I completely on the wrong track here or do I have a point??

EUVL · 7th January 2011, 04:02 PM

You are absolutely on the right (but very expensive) track :

Balanced F5 question

The PCBs that connects all these caps together are 110x80mm, double sided 210um (6 oz. I thnk) copper. Copper costs money.

Patrick

massimo · 7th January 2011, 04:22 PM

Quote:

Originally Posted by EUVL

Copper costs money.

.... and now more than ever! Look how this (precious) metal increase its value in 2010.

Neutrality · 7th January 2011, 04:32 PM

Quote:

Originally Posted by EUVL

You are absolutely on the right (but very expensive) track :

Balanced F5 question

The PCBs that connects all these caps together are 110x80mm, double sided 210um (6 oz. I thnk) copper. Copper costs money.

Patrick

Ah, thats just, insane.

But think I'll stay at 2-3 oz. Should be sufficient.

Most likely making a CRC supply, with 5 x 2200 uF caps - resistor - 5 x 2200 uF caps pr rail, as a minimum, might go nuts and add even more caps, but lets see later on. Caps can be really expensive, even small ones, if you want high ripple current.

AndrewT · 04:40 PM

Hi,
what's wrong with assembling using copper wire, solid core or stranded?

Too much inductance?

What about rCRCRCC?
r=secondary resistance
C=4*2200uF
R=1r0//1r0//1r0//1r0
Buy 100off 2200uF and negotiate a big discount.

EUVL · 7th January 2011, 04:37 PM

Digi-Key - P10335-ND (Manufacturer - EEU-FC1H222)

At 1000 pcs, they cost less than 1 USD per piuece.

Patrick

7th January 2011, 11:54 AM	#9754
flg diyAudio Member Join Date: Jul 2005 Location: North East	Maybe here? F5 Listening Impressions & Discussion __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

7th January 2011, 04:36 PM	#9759
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, what's wrong with assembling using copper wire, solid core or stranded? Too much inductance? What about rCRCRCC? r=secondary resistance C=42200uF R=1r0//1r0//1r0//1r0 Buy 100off 2200uF and negotiate a big discount. __________________ regards Andrew T. Last edited by AndrewT; 7th January 2011 at 04:40 PM.*

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7th January 2011, 07:35 AM	#9753
EUVL diyAudio Member Join Date: Oct 2003	Nelson has also treid all 3 types (Tos, IRF, FQA) and posted his opinions here. Why not search for his comments. Patrick

7th January 2011, 03:52 PM	#9755
Neutrality diyAudio Member Join Date: Oct 2004 Location: Aalborg, Denmark	Thinking about PSU size for dual mono F5, what can and cant you do. I was thinking going for less total capacity but instead focusing on ripple current and low ESR. Wouldnt a lower total capacity than what pass uses in his PSU, but high ripple current and low ESR be better than a huge total capacity but less ripple current and higher ESR? Can get some very high ripple 2200 uF 50V 105 C caps, around 2.5-3.5A pr cap. Ten of these pr rail would give you 22000 uF pr rail but 25-35A total ripple current and very low ESR. Am I completely on the wrong track here or do I have a point??

7th January 2011, 04:02 PM	#9756
EUVL diyAudio Member Join Date: Oct 2003	You are absolutely on the right (but very expensive) track : Balanced F5 question The PCBs that connects all these caps together are 110x80mm, double sided 210um (6 oz. I thnk) copper. Copper costs money. Patrick

7th January 2011, 04:37 PM	#9760
EUVL diyAudio Member Join Date: Oct 2003	Digi-Key - P10335-ND (Manufacturer - EEU-FC1H222) At 1000 pcs, they cost less than 1 USD per piuece. Patrick

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