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JLH 10 Watt class A amplifier
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Old 24th September 2019, 12:13 AM   #5591
grunf is offline grunf  Croatia
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A few days ago I put the CRCRC filter back in power supply before the regulators, I lost another 2V on it and 3V on the regulator so now I have +/- 19V to power the JLH69.
The JLH69 sounds better again, so this combination definitely stays in the amp.
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File Type: jpg JLH69.jpg (312.4 KB, 879 views)
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Old 27th September 2019, 04:18 PM   #5592
Cerniu is offline Cerniu  Lithuania
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Quote:
Originally Posted by grunf View Post
A few days ago I put the CRCRC filter back in power supply before the regulators, I lost another 2V on it and 3V on the regulator so now I have +/- 19V to power the JLH69.
The JLH69 sounds better again, so this combination definitely stays in the amp.
I see you have output transistors on separate heatsinks. Are they connected in some way that is not visible in the photo, or is it not a problem if they are on separate unconnected heatsinks?
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Old 30th September 2019, 07:40 PM   #5593
grunf is offline grunf  Croatia
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Originally Posted by Cerniu View Post
I see you have output transistors on separate heatsinks. Are they connected in some way that is not visible in the photo, or is it not a problem if they are on separate unconnected heatsinks?

It doesn't matter because both transistors have the same dissipation, so they heat equally.
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Old 13th October 2019, 10:11 AM   #5594
Mooly is offline Mooly  United Kingdom
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JLH 10 Watt class A amplifier


Duffo adele, your post has not been approved as you have been repeatedly told to post in English.

From the rules:

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6: Posting in a language other than English without a translation.
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Old 14th October 2019, 11:14 AM   #5595
Duffo adele is offline Duffo adele
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hello to all I am french and the translations being very bad, my knowledge in very limited electronics I do not understand all.Est what one of you could give me the schema leads jlh2003 with the list of components and the rule of the current of rest for a power supply of + - 30 vd advance a big thank you to you
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Old 14th October 2019, 03:14 PM   #5596
Duffo adele is offline Duffo adele
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Hello to all i am french the traductions being very bab, but knowledge in very limited electronics i have a lot of trouble understanding you. Is that one of toi cloud give me the définitive schema of jlh 2003 with the list of the components and setting the quiescent current for a + -30v Feed in advance a big thank you to you
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Old 14th October 2019, 03:57 PM   #5597
prasi is online now prasi  India
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JLH 10 Watt class A amplifier
Hello Adele,
Have a read at the site here...
The Class-A Amplifier Site

Also I have posted PCB design for 2 pair output device 2003 version.
Please see here...

JLH 10 Watt class A amplifier
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Old 17th October 2019, 11:51 AM   #5598
Duffo adele is offline Duffo adele
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Hello message to huggygoud I already explained on the forum that I don't understand anything about translations.is what we could match by email or phone. I want to assemble a jlh2003 and I have a great need for advice. But in good French. Thank you
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Old 18th October 2019, 07:02 AM   #5599
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by tschrama View Post
Thanks every one... I know the 2n3055 are old and considered not suiteble for quality audio.. I also read that in D.Self's book.. so I would like to switch to the MJ15003's.. I just need to find them first

greetings,
Thijs
I use the MJ15003/4 in an update of the 1980's Maplin disco amplifier.
They work very well.
I get mine from CPC, Farnell and RS Components with no problems.
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Old 28th October 2019, 12:26 PM   #5600
Rallyfinnen is offline Rallyfinnen  Sweden
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Hello!

Looking for advice/suggestions on JLH projects here.. I bought a pair of the chinese JLH kits (white PCB 1pc JLH 1969 Class A Verstarker Board Hifi hochwertiger PCB mot/2n3055 Do it yourself Kits | eBay)
and a pair of 'JLH2003' boards with dual supply and double outputs 2 PCs Hood jlh2003 Class A Single-Ended Power Amplifier PCB 2 Kanal 22w+22w | eBay


The white boards I have been thinking of modifying to 'sublimed' ( sublimed JLH1969 )
Or, should I just keep it as is, or maybe replace just outputs?

The dual supply/dual output boards need populating.. any recommendations on what good and easy to find transistors I should use? Possible improvements?
Attached Images
File Type: jpg jlh white.jpg (46.1 KB, 287 views)
File Type: jpg jlh dual.jpg (128.3 KB, 277 views)
File Type: jpg jlh dual sch.jpg (71.3 KB, 280 views)
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