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Old 20th January 2014, 01:28 PM   #1
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Default Upping the Watts

Hi,
just sent for a chinese JLH 10 watt amplifier kit.
I intend to see what it sounds like using better parts than come with the kit.

The power transistors are 2n3005. I think these can take quite a large voltage.
My question is can the wattage be increased and how would I do it.
Is it just more DC voltage in and higher rated caps etc.

cheers and Happy New Year.
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Old 20th January 2014, 01:32 PM   #2
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No, it's the power rating not the voltage that is the problem.
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Old 20th January 2014, 01:34 PM   #3
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Hi,
So if I stick more amps into it I should get a wattage increase.
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Old 20th January 2014, 01:37 PM   #4
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hi,
My favourite output transistors are MJ15003 so they will be fitted.
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Old 20th January 2014, 01:45 PM   #5
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Quote:
Originally Posted by j baldam View Post
So if I stick more amps into it I should get a wattage increase.
No.

Read up on some basics about electronics. Check out Rod Elliot's ESP site which has some good articles from basics about amplifiers and electronics.

For now, just build the amp as it's meant to be. Putting faster transistors in might introduce instability. When you understand a bit more then you can play about with it. Nothing worse than trying to get a kit working when you don't know.
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Last edited by richie00boy; 20th January 2014 at 01:51 PM.
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Old 20th January 2014, 02:27 PM   #6
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hi ritchie,

Built plenty, Including kits from Rob down under, but must admit I am lazy about theory.
These Chinese amps have dubious parts so I intended to pick better parts to see how it sounds before I solder inferior parts in.
Just wondered what held this amp back to 10 watts.
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Old 20th January 2014, 02:38 PM   #7
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hi ritchie, your post came through to my email unedited.

I do have a clue about what I'm doing, repaired Exposure amps repaired Linn amps, built other JLH designs Chiarra pre amp power supplies etc. Built a pair of Isobariks from scratch!!!! Been swapping systems for 40 years.

Had a couple of magic smoke incidents but haven't we all.
As I asked, just unclear regarding the theory of output wattages.

I will read.

cheers
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Old 20th January 2014, 03:04 PM   #8
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Have a look and don't be afraid to ask any questions here.
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Old 20th January 2014, 03:05 PM   #9
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Hi
there is a table featured in an update to the original design that seems to suggest that the output wattage is dependant upon the input voltage of the transformer. As the input voltage rises the output wattage rises.

The Class-A Amplifier Site - JLH Class-A Update
a secondary voltage of 30v will give 60 watts into 8 ohms.
Could I stand corrected or is that my original thought from my post.
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Old 20th January 2014, 03:37 PM   #10
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Which kit are you buying? The one in the article you linked to is the 1996 version with dual rails. Is that the one you are building? There is also the 1969 version that uses a single rail supply.
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