Hi
Just a suggestion.
Can you check whether any of the pins of the mje15003 is touching the heatsink.
I use heatshrink on the pins
regards
kp93300
I found the error. The BD139 was shorted. Both old and new design now working flawlessly :-D
EDIT: BTW Siliconray, i got some 2SC5200 / 2sa1943 from a NAD laying around, do you know if i could try them out on one of the sets? Do you know how they sound in class a, if possible
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Post a picture ?
Hi Siliconray,
can you post a picture of your board and the heatsink size ?
I am about to begin populating the boards.
thanks
kp93300
Hey good work Shamron
Of course you should try 2SC5200 and 2SA1943. Actually the amp in my home is exactly use this pair, sound very good
Hi Siliconray,
can you post a picture of your board and the heatsink size ?
I am about to begin populating the boards.
thanks
kp93300
Siliconray, i am happy to tell you that i've completed 3 sets of this amplifier now and a friend is working on his now. Today we got wood for the cases for the rest of them, but here is one i've put into a 3U Modushop case:
The other two i'm planning on inserting into some homemade wood cases and using heatsinks from some inferior amplifiers that now is sleeping with the fishes. (Nad's. We fix them at work all the time). Here is a pic of one that's done but with the 69 version of JLH:
And here is one i'm building right now with the newly aquired wooden pieces:
My next journey will be to build a JLH class a headphone amp, i noticed you sold kits for one, right? Do you also supply the casing and the trafo on the pictures?
An externally hosted image should be here but it was not working when we last tested it.
The other two i'm planning on inserting into some homemade wood cases and using heatsinks from some inferior amplifiers that now is sleeping with the fishes. (Nad's. We fix them at work all the time). Here is a pic of one that's done but with the 69 version of JLH:
An externally hosted image should be here but it was not working when we last tested it.
And here is one i'm building right now with the newly aquired wooden pieces:
An externally hosted image should be here but it was not working when we last tested it.
My next journey will be to build a JLH class a headphone amp, i noticed you sold kits for one, right? Do you also supply the casing and the trafo on the pictures?
I have 4 big toroid transformer which were disassemblyed fron an US made auido equipment, like new. They are 110V and usless for me. I would like to send it to those who want to buy JLH amplifier full kit + Power supply for free
This transformer is ideeeeeeal for Stereo JLH power amplifier (for US and canada DIYers). Spec:
Power: >150W
output1: 24-17-0-17-24
output2: 8V
weight: 2kg
Only 4 available, only one for one person.
Plus $25 for air shipping. PM me if you have interest.
This transformer is ideeeeeeal for Stereo JLH power amplifier (for US and canada DIYers). Spec:
Power: >150W
output1: 24-17-0-17-24
output2: 8V
weight: 2kg
Only 4 available, only one for one person.
Plus $25 for air shipping. PM me if you have interest.
Attachments
Can anyone please chime me in on the use of the JLH power supply pcb?
Free Power Supply PCB For JLH Amplifier - Boards | Kits | Components | Modules | Tools <--- that guy right there. I understand that the 60,000uF cap bank is necessary for the transformer, but I'm not sure the purpose of the additional power supply board.
Free Power Supply PCB For JLH Amplifier - Boards | Kits | Components | Modules | Tools <--- that guy right there. I understand that the 60,000uF cap bank is necessary for the transformer, but I'm not sure the purpose of the additional power supply board.
JLH amps
Hi SiliconRay.
I have just placed two more orders for the JLH amps and PSU. Got the first lot from you, and should have requested first batch with 2n3055. Reason being I'm going to be using MJ802 transistors in any case.
Help me with something else please; I have very little electronics knowledge - I can assemble and do basic trouble shooting - but how does one test to match the output transistors. I have about 40 MJ802s so have a whole bash to choose from.
Thanks, Kevin.
BTW great website - I'll get around to a tube SE amp one day. Will post pics of JLH amps when done.
Hi SiliconRay.
I have just placed two more orders for the JLH amps and PSU. Got the first lot from you, and should have requested first batch with 2n3055. Reason being I'm going to be using MJ802 transistors in any case.
Help me with something else please; I have very little electronics knowledge - I can assemble and do basic trouble shooting - but how does one test to match the output transistors. I have about 40 MJ802s so have a whole bash to choose from.
Thanks, Kevin.
BTW great website - I'll get around to a tube SE amp one day. Will post pics of JLH amps when done.
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