http://jm.plantefeve.pagesperso-orange.fr/sche.html
Those are similar amplifiers (same family) and all use 2SK1058 & 2SJ162, take a look please.
If you plan to build the Zenotron why not the original ProFet? Same PC board.
Take a look at this little amp
I do not understand all because my French is almost non exist.
https://www.phd-audio.fr/singlotron.html
Those are similar amplifiers (same family) and all use 2SK1058 & 2SJ162, take a look please.
If you plan to build the Zenotron why not the original ProFet? Same PC board.
Take a look at this little amp
I do not understand all because my French is almost non exist.
https://www.phd-audio.fr/singlotron.html
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because it was a commercial arrangement with Selectronic and Selectronic did not respect its commitment, so I went through Jean Marc who sent me his files under Proteus and the address of the person who made the PCBs (very old school).
It's been twenty years since I assembled it
It's been twenty years since I assembled it
Offset comes from resistance tolerances. I use resistors with 1% and 0.6W metal film and I have never had an offset over 3mV. And I see another anomaly that increases the offset. R4 + R5 = R1.
It will be a great satisfaction for you to build your own amplifier from step one to the last. Go for it. I wish you all the success in your effort.
Building Elektor's AXL class A 2 x 16W some years ago, the editor have written clearly that if there is an offset voltage more than +-50mV, increase or decrease the resistors values of the differential amplifiers . That has been very boring to me, so When I matched the BC550 and BC560 in that circuit, the offset fell to 9mV. In all my projects i use 1% metal film resistors 1/2W from Vishay or dale. The offset voltage is not a matter of tolerance at all.
Yes I like to do that, total DIY. From PCB to the finish product!😎
I mentioned this to you, the Zenotron is the DIY version of the ProFet.
https://www.gods69.com/download/AUDIO/7480MM.pdf
I built my based on the original but I used only 17.5VDC rail voltage bias-ed into Class A . 1 A total bias.
It sounded great in a smaller room but in my living room it came out her weakness. The original can be bridged.
I gave up on her, perhaps too soon. My friend built it with 20V transformer and was happy with her.
Still have 4 stuffed PCB without the power mosfets. One day I may try it with a different PS (with a higher rail voltage).
One amplifier similar topology I strongly advise to take a look! I believe this is better that the ProFet or Zenotron.
https://www.diyaudio.com/community/threads/f5-meets-buzquito.162042/
I mentioned this to you, the Zenotron is the DIY version of the ProFet.
https://www.gods69.com/download/AUDIO/7480MM.pdf
I built my based on the original but I used only 17.5VDC rail voltage bias-ed into Class A . 1 A total bias.
It sounded great in a smaller room but in my living room it came out her weakness. The original can be bridged.
I gave up on her, perhaps too soon. My friend built it with 20V transformer and was happy with her.
Still have 4 stuffed PCB without the power mosfets. One day I may try it with a different PS (with a higher rail voltage).
One amplifier similar topology I strongly advise to take a look! I believe this is better that the ProFet or Zenotron.
https://www.diyaudio.com/community/threads/f5-meets-buzquito.162042/
Thanks a lot for your recommendation. Good luck with your project.
Hi @metanastis
I would like to build lang and Axl class A amplifier.. I have 10 pcs ECX10N20S and ECX10P20S Exicon Lateral mosfets.
Could you give me some advice?
Mosfet must be matched?
Lang bias is 2A? AXL is 1A?
Which amplifier have good sound?
I would like to build lang and Axl class A amplifier.. I have 10 pcs ECX10N20S and ECX10P20S Exicon Lateral mosfets.
Could you give me some advice?
Mosfet must be matched?
Lang bias is 2A? AXL is 1A?
Which amplifier have good sound?
sercan85
Having built both I can declare that Lang is slightly better and more powerful than AXL.They have a very good sound both. There are surely some other amps that play better.
If you want to use the exicon mosfets, you must make a couple of modifications on the output circuit.
HerrFlick is the guy to ask as he has used them in his amps.
Cheers
