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Old 30th March 2005, 10:47 AM   #11
jez is offline jez  United Kingdom
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I have built the "ultimate JLH" type circuit from the class A amplifier site mentioned above, I've made many changes of my own including modern V.high speed transistors, greater power and fan cooling. It gives about 22 watts per channel and is one of the best amps I have ever heard.
I have also built an amplifier using LM3886 IC's (I refuse to use the stupid "gainclone" name!, people have been building chip based amps for dacades before it) and, Yes it is shockingly good (better than most amps I have heard upto £1000) but not as good as the JLH. When you consider though, that the JLH has about £200 of parts in it(14 x 22000Uf caps, twin 300va TX's, huge heatsinks, fan cooling etc) and the LM3886 amp cost about £20 and is not THAT far behind it....... makes you think eh?.
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Old 30th March 2005, 11:30 AM   #12
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hmmm than i have maybe to modify my Jlh.
The setup for de jlh is: 40V supply, 330Va Torroid one for two channels, 30000uF each channel, Elna Capacitors in the amplifier, 12000uF Marcon output capacitor.

Anyone an idea for update?

Thanks everybody
and again sorry for my english.

Maarten
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Old 30th March 2005, 11:38 AM   #13
paulb is offline paulb  Canada
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Default Re: Jlh '69 vs Gainclone or Hiraga

Quote:
Originally posted by maartentje
Hai Guys,

I have a pair of Dynaudio Nuance Speakers (look at the picture) these are 86db/w 4ohm and i drive them with a John Linsley Hood '69 10watt. But i want build something beter than that, is a Gainclone or a Hiraga 20watt beter than my old Jlh?

Sorry for my English.

Greetz Maartie and Thanks.

Quote:
Originally posted by carlosfm
The problem is... that Dynaudio speaker will not be very happy with a 10~20W amp.

A pair of paralleled LM3886 chips will give around 100W at 4 ohms, and about 22A max. output current.

It sounds like they're 'happy' with a JLH 10 watt.
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Old 30th March 2005, 11:40 AM   #14
paulb is offline paulb  Canada
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Quote:
Originally posted by maartentje
hmmm than i have maybe to modify my Jlh.
The setup for de jlh is: 40V supply, 330Va Torroid one for two channels, 30000uF each channel, Elna Capacitors in the amplifier, 12000uF Marcon output capacitor.
Anyone an idea for update?
Maarten
A capacitance multiplier, use separate ones for left and right channels. Read through the update sections at the JLH site posted earlier. He claims significant improvement by separating the power supply sections.
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Old 30th March 2005, 11:48 AM   #15
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Default Re: Re: Jlh '69 vs Gainclone or Hiraga

Quote:
Originally posted by paulb
It sounds like they're 'happy' with a JLH 10 watt.
It depends on the type of music they listen to.
I know a guy who was satisfied with his system until I took one of my CDs to his house.
This CD as strong bass, but it has to sound tight.
Well... the resonance was so nasty we simply couldn't bare to listen.

The amp was a 3-channel Denon power amp, and the speakers were B&W 602S3.
The speakers are quoted 8 ohms, 91db sensitivity.
The amp is quoted 120W RMS/8ohms, 200W RMS/4ohms.

The amp simply couldn't drive those speakers.
The 602 are very hard to drive, they go as low as (measured) 2.8 ohms.

Dynaudio speakers are also very hard to drive.
I have a friend that had to decide between changing his big AVI integrated (150W RMS/8ohms) or his pair of Dynaudio speakers.
One didn't go with the other.
He changed the speakers.
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Old 30th March 2005, 01:52 PM   #16
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Quote:
Originally posted by analog_sa

Has anyone else critically compared paralleled chips?
I'm coming up with a new LM4780 board, that will allow all 3 options on a single board: stereo, parallel and bridged.

Making exact comparisons will be greatly simplified, as it will come down to merely switching a jumper.

So far, the parallel LM4780 was not better than LM3875 (both premium versions), and my preference went with smaller cheap each time I ( and some of my friends) compared them. But those comparisons where not exactly accurate (and fair).
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Old 30th March 2005, 03:46 PM   #17
protos is offline protos  Greece
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Has anyone compared the standard gc with the SuSy gc?
Now that would be interesting.
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Old 30th March 2005, 07:27 PM   #18
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Cool 2 // OPA549 sub...

... and my beloved Epos 11 speakers.
Speakers with pedigree.
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Old 30th March 2005, 11:19 PM   #19
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[QUOTE]Originally posted by Peter Daniel
[B]

I'm coming up with a new LM4780 board, that will allow all 3 options on a single board: stereo, parallel and bridged.



Sounds an excellent idea Peter, I’m interested and will be following the development.

Cheers…
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Old 30th March 2005, 11:32 PM   #20
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Peter, will you have a snuberized PSU as well?
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