My JLH-2005 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Closed Thread
Thread Tools Search this Thread
Old 14th November 2011, 05:47 AM   #1
diyAudio Member
Join Date: Sep 2011
Blog Entries: 1
Default My JLH-2005

Just finish my first JLH-2005. The circuit is from this link:
The Class-A Amplifier Site - JLH Class-A Update

schematic and pcb attached.

A few thought about the design
1. The original 1969 design use 2N3055 as Q1 and Q2. Then changed to MJ15003. I'm thinking of some other subsititutes such as 2N3773, MJ21194 or 2SC5200

2. Can I use 2SA1358 as replacement of BD140? it's complementary of 2SC3421.

3. How to set the value of VR1, VR2 and VR3? in other words, what current should those 3 current sources be?

4. Is the large polygon pour on PCB good for audio amplifier?
Attached Images
File Type: jpg JLH-2005-sch.jpg (90.7 KB, 402 views)
File Type: jpg jlh2005.jpg (137.6 KB, 395 views)
__________________ High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services
Chat with me

Last edited by siliconray; 14th November 2011 at 05:58 AM.
Old 14th November 2011, 05:53 AM   #2
diyAudio Member
Join Date: Feb 2004
Location: Queensland Australia
Hi might think about moving this to the big JLH thread as you'll then get all the '69ers and '96ers (and every other version of it his great work) who will more likely appreciate your own construction...... just a thought...cheers, Jonathan
"It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse.
Old 14th November 2011, 06:01 AM   #3
diyAudio Member
Join Date: Sep 2011
Blog Entries: 1
OH...good suggestion. I will post in that thread. But how to delete this post?
__________________ High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services
Chat with me
Old 14th November 2011, 10:42 AM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
I have reported post3.
You should see a closed thread notice, or maybe a deleted thread.
regards Andrew T.
Sent from my desktop computer using a keyboard
Old 14th November 2011, 10:51 AM   #5
diyAudio Moderator
pinkmouse's Avatar
Join Date: Apr 2002
Location: Rotherham, England
As if by magic...

Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?

Closed Thread

Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Marconi 2005 jartiili Equipment & Tools 4 10th November 2013 09:38 PM
Sears SP-2005 CivicProtection Multi-Way 20 11th February 2010 02:18 AM
Full-tube 2005 timothy Full Range 6 14th June 2005 05:36 PM
Seen at Home Entertainment 2005 jackinnj Analogue Source 0 2nd May 2005 11:56 AM
Maf 2005 gonefishin Multi-Way 2 31st May 2004 12:59 PM

New To Site? Need Help?

All times are GMT. The time now is 11:32 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2