Le Monstre vs. Parallel JLH class A?

deicide67 · 16th September 2009, 01:34 PM

I'm still in the parts collection stage, but still up in the air regarding which of these designs to build. Can anyone offer subjective opinion on these designs? The JLH looks nice and uses 4 output devices so I would assume it dissipates heat a bit better. Plus it uses TO-3 devices which my sinks are already tapped for.

Le Monstre looks simpler, and I can alter my sinks to use the 2SC5200s. It claims 58w into 8 ohms rms while the JLH is only 28w into 8 ohms, but will double into 4 ohms at 56w.

What design would you guys reccommend? What are your impressions of the sound quality of these designs?

Thanks for any information on these! Also, what size transformer is reccommended for these?

Blair

Bigun · 16th September 2009, 05:06 PM

Quote:

Originally Posted by deicide67

the JLH is only 28w into 8 ohms

I wonder what your needs are for power - what kind of speakers (impedance, sensitivity) and how loud you want to go. I suspect that 28W is plenty of power for your needs and shouldn't be a factor in choosing between these options. Power dissipation might be a factor, the lower power of the JLH means less heat-sinking. I haven't heard either amplifier, but I have read many consistent good reports on the JLH and it would be my choice if I had to make it.

deicide67 · 16th September 2009, 06:38 PM

Thank you! The JLH is the one I am more apt to build. Depending on what speakers I'm using they range from 4-8 ohm and are typically 87-90db efficient. I have used SET amps in my system many times and they are just shy of what I need in power at 12w. I purchased 80,000uf of capacitance during lunch along with TO-3 sockets and mica spacers. This should get me started on the layout for the monoblocks.

Thanks again!

Blair

Bigun · 08:57 PM

I'd be interesting to follow your progress. I've recently become a lot more interested in Class A amplifiers. I may start with something very simple (e.g. a single output transistor) to get my feet wet but if that turns out I'll be taking a good look at the JLH myself.

Your speaker sensitivity sounds fine. I'm not sure how well particular amps cope with 4ohm loads, but you have a chance to design to suit (e.g. more current flow perhaps) if you feel it needs it.

p.s. I discovered that you might be able to get a pcb: http://skycoral.com/1/?p=23

deicide67 · 17th September 2009, 02:07 PM

http://http://cgi.ebay.com/ws/eBayIS...m=320390377484

I wonder if that board is better than this one. Thanks for the link!

Blair

Bigun · 17th September 2009, 02:24 PM

that link doesn't seem to be working ?

If you compare the design of JLH with Rod Elliot's DOZ amp perhaps you can also repurpose the DOZ pcb ?

deicide67 · 17th September 2009, 03:07 PM

http://cgi.ebay.com/Pure-Class-A-OCL...#ht_2470wt_722

Try this one.

Blair

Shenda · 17th September 2009, 05:00 PM

Quote:

Originally Posted by deicide67

... the JLH is only 28w into 8 ohms, but will double into 4 ohms at 56w.

Blair

This is not true!

deicide67 · 17th September 2009, 05:05 PM

It says in the JLH article that this is the case on 22v rails. Is the article mistaken?

Would you care to elaborate?

Blair

woody · 17th September 2009, 05:16 PM

Hi deicde67, I do believe you are mistaken about the le monster it's output is ~7 watts
per channel.

16th September 2009, 01:34 PM	#1
deicide67 diyAudio Member Join Date: Aug 2008	Le Monstre vs. Parallel JLH class A? I'm still in the parts collection stage, but still up in the air regarding which of these designs to build. Can anyone offer subjective opinion on these designs? The JLH looks nice and uses 4 output devices so I would assume it dissipates heat a bit better. Plus it uses TO-3 devices which my sinks are already tapped for. Le Monstre looks simpler, and I can alter my sinks to use the 2SC5200s. It claims 58w into 8 ohms rms while the JLH is only 28w into 8 ohms, but will double into 4 ohms at 56w. What design would you guys reccommend? What are your impressions of the sound quality of these designs? Thanks for any information on these! Also, what size transformer is reccommended for these? Blair

16th September 2009, 08:51 PM	#4
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	I'd be interesting to follow your progress. I've recently become a lot more interested in Class A amplifiers. I may start with something very simple (e.g. a single output transistor) to get my feet wet but if that turns out I'll be taking a good look at the JLH myself. Your speaker sensitivity sounds fine. I'm not sure how well particular amps cope with 4ohm loads, but you have a chance to design to suit (e.g. more current flow perhaps) if you feel it needs it. p.s. I discovered that you might be able to get a pcb: http://skycoral.com/1/?p=23 __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig. Last edited by Bigun; 16th September 2009 at 08:57 PM.

17th September 2009, 02:24 PM	#6
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	that link doesn't seem to be working ? If you compare the design of JLH with Rod Elliot's DOZ amp perhaps you can also repurpose the DOZ pcb ? __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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16th September 2009, 06:38 PM	#3
deicide67 diyAudio Member Join Date: Aug 2008	Thank you! The JLH is the one I am more apt to build. Depending on what speakers I'm using they range from 4-8 ohm and are typically 87-90db efficient. I have used SET amps in my system many times and they are just shy of what I need in power at 12w. I purchased 80,000uf of capacitance during lunch along with TO-3 sockets and mica spacers. This should get me started on the layout for the monoblocks. Thanks again! Blair

17th September 2009, 02:07 PM	#5
deicide67 diyAudio Member Join Date: Aug 2008	http://http://cgi.ebay.com/ws/eBayIS...m=320390377484 I wonder if that board is better than this one. Thanks for the link! Blair

17th September 2009, 03:07 PM	#7
deicide67 diyAudio Member Join Date: Aug 2008	http://cgi.ebay.com/Pure-Class-A-OCL...#ht_2470wt_722 Try this one. Blair

17th September 2009, 05:05 PM	#9
deicide67 diyAudio Member Join Date: Aug 2008	It says in the JLH article that this is the case on 22v rails. Is the article mistaken? Would you care to elaborate? Blair

17th September 2009, 05:16 PM	#10
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Hi deicde67, I do believe you are mistaken about the le monster it's output is ~7 watts per channel.

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