X.5 series could be improved?

mert · 23rd August 2007, 09:14 PM

Mr. Pass,

Is there any posibility to make a ''perfect'' X250.5 or X350.5 amp?
(keeping working principle as how it was but maybe using best of the best parts and internal wiring?)

Regards

Mert

Nelson Pass · 24th August 2007, 02:21 AM

No. The design is not perfect. When I create a perfect amplifier,
I will disappear in a puff of smoke.

The X series is most easily improved by increasing the bias,
which generally means better heat sinking and power supply.

There are the usual tweaks, your favorite capacitors, wire,
resistors, etc, many of which work, adding some small measure
of improvement.

It's not hard to form a list - unfortunately the items on it cost
a lot of money. We have used all the economical approaches
we know, and some that are not.

macka · 24th August 2007, 01:46 PM

Have not seen much of you lately

.

My feeling is as an X250.5 user if you think it needs improving something else is wrong. Buy a Lavry Dac and a Passlabs X2.5.
Game over Man, Game Over!

mert · 24th August 2007, 03:58 PM

Mr. Pass,

''increasing the bias'' means forcing the amp. to run more in Pure Class A mode under constant power?

Secondly, do you make custom built amps?( improving the internal parts, heat sink, power supply..)

Thirdly,

Have you ever heard liquid cooling?

Nelson Pass · 24th August 2007, 08:31 PM

Quote:

Originally posted by mert
''increasing the bias'' means forcing the amp. to run more in Pure Class A mode under constant power?

Secondly, do you make custom built amps?( improving the internal parts, heat sink, power supply..)

Thirdly, Have you ever heard liquid cooling?

1) Any increase in bias is good, and it doesn't have to be
in pure Class A.

2) No.

3) Yes.

mert · 24th August 2007, 09:26 PM

Quote:

Originally posted by Nelson Pass

1) Any increase in bias is good, and it doesn't have to be
in pure Class A.

2) No.

3) Yes.

Is there any chance to apply liquid cooling on amplifiers?(pc nuts apply to motherboard, ram, processor, harddisk, graphic card....pc works without fans)

GRollins · 25th August 2007, 03:01 AM

I've done a fair amount of work on water cooled circuits. I did a thread on it at one point. I am still using the same setup and still think it's the easiest way to deal with heat...however, it's not portable. How big a problem that is to you is for you to decide.
It's not the sort of thing that you can retrofit to an existing amp. You'll have to start from scratch. However, the system I've got will dissipate something on the order of 2kW of heat without breaking a sweat (ahem). I've never found the limit of what the system can do.
Incidentally, I make no claims that water cooling sounds different (setting aside mechanical noise from the pump, which is in another room anyway), only that it's a very efficient way to move heat.

Grey

mert · 25th August 2007, 07:19 PM

Grey

check thermaltake water coolers, there is usefull information how their system works.
www.thermaltake.com

GRollins · 26th August 2007, 03:00 AM

My system is much larger and cheaper as well.

Grey

macka · 27th August 2007, 09:49 PM

Just the amp in another room and force air cool it.

Be careful of the bias settings. They are quite sensitive and it will take some time to balance everything.

In any case this is not something I would recommend

You can experience the joy of simply increasing the bias with a passdiy project.

Macka

23rd August 2007, 09:14 PM	#1
mert diyAudio Member Join Date: Dec 2006	X.5 series could be improved? Mr. Pass, Is there any posibility to make a ''perfect'' X250.5 or X350.5 amp? (keeping working principle as how it was but maybe using best of the best parts and internal wiring?) Regards Mert

25th August 2007, 07:19 PM	#8
mert diyAudio Member Join Date: Dec 2006	water coolers Grey check thermaltake water coolers, there is usefull information how their system works. www.thermaltake.com

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24th August 2007, 02:21 AM	#2
Nelson Pass The one and only Join Date: Mar 2001	No. The design is not perfect. When I create a perfect amplifier, I will disappear in a puff of smoke. The X series is most easily improved by increasing the bias, which generally means better heat sinking and power supply. There are the usual tweaks, your favorite capacitors, wire, resistors, etc, many of which work, adding some small measure of improvement. It's not hard to form a list - unfortunately the items on it cost a lot of money. We have used all the economical approaches we know, and some that are not.

24th August 2007, 01:46 PM	#3
macka diyAudio Member Join Date: Dec 2001 Location: Australia	Have not seen much of you lately . My feeling is as an X250.5 user if you think it needs improving something else is wrong. Buy a Lavry Dac and a Passlabs X2.5. Game over Man, Game Over!

24th August 2007, 03:58 PM	#4
mert diyAudio Member Join Date: Dec 2006	Mr. Pass, ''increasing the bias'' means forcing the amp. to run more in Pure Class A mode under constant power? Secondly, do you make custom built amps?( improving the internal parts, heat sink, power supply..) Thirdly, Have you ever heard liquid cooling?

25th August 2007, 03:01 AM	#7
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	I've done a fair amount of work on water cooled circuits. I did a thread on it at one point. I am still using the same setup and still think it's the easiest way to deal with heat...however, it's not portable. How big a problem that is to you is for you to decide. It's not the sort of thing that you can retrofit to an existing amp. You'll have to start from scratch. However, the system I've got will dissipate something on the order of 2kW of heat without breaking a sweat (ahem). I've never found the limit of what the system can do. Incidentally, I make no claims that water cooling sounds different (setting aside mechanical noise from the pump, which is in another room anyway), only that it's a very efficient way to move heat. Grey

26th August 2007, 03:00 AM	#9
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	My system is much larger and cheaper as well. Grey

27th August 2007, 09:49 PM	#10
macka diyAudio Member Join Date: Dec 2001 Location: Australia	Just the amp in another room and force air cool it. Be careful of the bias settings. They are quite sensitive and it will take some time to balance everything. In any case this is not something I would recommend You can experience the joy of simply increasing the bias with a passdiy project. Macka

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