Which GC is good for this?

Dougie085 · 1st July 2007, 11:04 PM

I'm looking for like 100 wpc at 8ohms or at least about 60 ish. Whats a good GC board I can get that will let me achieve this? Also are these class A? or Class A/B?

AndrewT · 1st July 2007, 11:15 PM

Hi,
chipamps are definitely not ClassA. They may be ClassAB but since the internal design is inaccessible we can only guess.

Most chipamps can give a maximum of about 50W to 60W into a mildly reactive load.
If you want 100W you will need to parallel a pair of chipamps.
If you want to drive loads lower than 8ohm you should consider paralleling if you want near maximum power.

Dougie085 · 1st July 2007, 11:21 PM

Have you compared the sound much to a Class A mosfet based amp? Just curious how they compare?

Dougie085 · 1st July 2007, 11:50 PM

Is the 3886 or 3875 capable of 50-60 watts?

BWRX · 2nd July 2007, 12:05 AM

Yes. Have a look at the part datasheets at www.national.com

Leolabs · 2nd July 2007, 01:27 AM

Or try the BPA.

justblair · 2nd July 2007, 04:56 PM

Quote:

Originally posted by AndrewT
Hi,
chipamps are definitely not ClassA. They may be ClassAB but since the internal design is inaccessible we can only guess.

Most chipamps can give a maximum of about 50W to 60W into a mildly reactive load.
If you want 100W you will need to parallel a pair of chipamps.
If you want to drive loads lower than 8ohm you should consider paralleling if you want near maximum power.

The datasheet refers to them as "quasi class AB". According to

Custom analogue

The amplifier is in biased as class A right up until the final ouput stage, which is quasi.

I dont know enough to say if this is true, but I believe what I read generally

Kinnja · 3rd July 2007, 11:50 PM

You might find something suitable at http://www.41hz.com/

Some of their kits use surface mount components, which might be hard to solder.

Dougie085 · 4th July 2007, 12:17 AM

Yeah I saw those. I think I'm gonna go with a SS design. Probably the F4 do 2 stereo set's to get 100wpc at 8ohms full class a.

AndrewT · 4th July 2007, 08:49 AM

Quote:

Originally posted by Dougie085
Yeah I saw those. I think I'm gonna go with a SS design. Probably the F4 do 2 stereo set's to get 100wpc at 8ohms full class a.

Have you seen the size of the Krell KSA100 that is being cloned in the thread on this Forum?

That's what ClassA will look like!

1st July 2007, 11:04 PM	#1
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	Which GC is good for this? I'm looking for like 100 wpc at 8ohms or at least about 60 ish. Whats a good GC board I can get that will let me achieve this? Also are these class A? or Class A/B?

1st July 2007, 11:15 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, chipamps are definitely not ClassA. They may be ClassAB but since the internal design is inaccessible we can only guess. Most chipamps can give a maximum of about 50W to 60W into a mildly reactive load. If you want 100W you will need to parallel a pair of chipamps. If you want to drive loads lower than 8ohm you should consider paralleling if you want near maximum power. __________________ regards Andrew T.

2nd July 2007, 12:05 AM	#5
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	Yes. Have a look at the part datasheets at www.national.com __________________ Brian

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1st July 2007, 11:21 PM	#3
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	Have you compared the sound much to a Class A mosfet based amp? Just curious how they compare?

1st July 2007, 11:50 PM	#4
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	Is the 3886 or 3875 capable of 50-60 watts?

2nd July 2007, 01:27 AM	#6
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Or try the BPA.

3rd July 2007, 11:50 PM	#8
Kinnja diyAudio Member Join Date: Jan 2007	You might find something suitable at http://www.41hz.com/ Some of their kits use surface mount components, which might be hard to solder.

4th July 2007, 12:17 AM	#9
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	Yeah I saw those. I think I'm gonna go with a SS design. Probably the F4 do 2 stereo set's to get 100wpc at 8ohms full class a.

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