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Old 17th October 2005, 11:13 PM   #1
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Default JLH Class A PCBs?

Any sources for PCBs for the JLH Class A amp?

Or is this the project where I finally hone my PCB design skills and actually make a board....

I see there are a few websites that outlines various updates to the design.....but doing it point to point seems a bit much. I like my SS on a good PCB.

thanks for any sources,
Tommytube
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Old 17th October 2005, 11:41 PM   #2
Geoff is offline Geoff  United Kingdom
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email me (via the button below) with your specific requirements. I may well be able to help.

Geoff
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Old 18th October 2005, 06:20 PM   #3
amt is offline amt  United States
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Default me too plz

Id be interested as well. Im looking at the ESL57 version, although if boards arent available, I can probably produce some using the layouts on your website (never done PCBs before though).

Hey tommytube, how "easternly" are you?

amt
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Old 18th October 2005, 06:32 PM   #4
Geoff is offline Geoff  United Kingdom
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Default Re: me too plz

Quote:
Originally posted by amt
Id be interested as well.
OK, drop me an email and I'll see what I can do in terms of a layout (I have a few prepared but not yet proven). I prefer to do it this way so that I have your email address in case I need to send an attachment.

Geoff
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Old 19th October 2005, 04:43 AM   #5
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Default oregon

AMT -
I'm north of Pendleton in Milton Freewater. I live a mile south of the Washington border. I work in Walla Walla. Where are you at?

Geoff-
I've looked at your site and thought it's a great resource. I'd like a PCB, but if they're not ready, they're not ready. If you have a list of people waiting for confirmation on that particular revision, please add me to it.

thanks,
Tom
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Old 19th October 2005, 10:06 PM   #6
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Hi tommytube ,
mrothacher on Trading Post - Class A projekt Chassis
has 1 Set of PCBs , his website is www.audiohobby.com

Greetings from Germany

Jürgen
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Old 20th October 2005, 06:52 PM   #7
amt is offline amt  United States
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Ahh, a northerner. Im down in Eugene. So you going build a JLH anytime soon? Im working on a chassis and will eventually build the 1996, per Geoffs revision and Tim Andrews parts recommendations. But I may throw together a 1969 version just for fun. I have a pile of salvaged parts that will just about do it.

amt
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Old 20th October 2005, 08:32 PM   #8
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Default JLH

AMT,
I'm hoping to eventually get Geoff's released boards, but it will be awhile. Perhaps next year. I've never done a Class A amp and would like to experiment.

I am just completing a Mauro Penasa MY REF gainclone based on the LM3886 chip. Hooked it up for the first time last night to the big rig and got marvelous sound from the get go. I've done some Tripath amps this year as well, but SS Class A is still calling.

I may go for a UD180 at some point.

Also want to do an EL34 next year.

Plenty of project in the mix, just the way I like it.

Tommytube
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Old 20th October 2005, 09:15 PM   #9
selim is offline selim  Turkey
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Default Spare PCBs for 69 version

Dear All,

By profession, I feel more comfortable doing my graphical
work using AutoCAD.Therefore, I do all my PCBs manually
in AutoCAD and a local supplier manufactures the PCBs for me.
But his minimum manufacturing number is 50.So, over the years,
I have accumulated hundreds of PCBs.My project for last year
was JLH 69.I built the amp on a PCB measuring 11 cm. by 13. cm.
All the components are on the PCB.The power supply, 78xx
regulator with a pass transistor,supply capacitor and output
capacitor, output transistors on L brackets.The transistors are
all plastic types with 3 of them (2 for the output and 1 for the
regulator) sharing the same L bracket heatsink adapter.There
is provision for adjusting the center voltage,idle current and,
if you want to, including the output cap inside the feedback loop.
What I found out is you have to keep the power low for the
output transistors to remain on the same board with the rest of the amp, because my L bracket is not really efficient in conveying
the heat from the transistors.

If anybody is interested, I have about 40 of those boards left.

Selim
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