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Old 14th November 2011, 05:47 AM   #1
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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, 296 views)
File Type: jpg jlh2005.jpg (137.6 KB, 290 views)
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Last edited by siliconray; 14th November 2011 at 05:58 AM.
 
Old 14th November 2011, 05:53 AM   #2
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Hi Siliconray........you 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
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Old 14th November 2011, 06:01 AM   #3
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OH...good suggestion. I will post in that thread. But how to delete this post?
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Old 14th November 2011, 10:42 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
I have reported post3.
You should see a closed thread notice, or maybe a deleted thread.
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Old 14th November 2011, 10:51 AM   #5
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