leiade, what are you after really? Of cource you can enhance the JC-amp. It can be a good start to start with something that actually works. Then when you have got it working, modify the design. If you can't design yourself, it's better to ask around and also look at other designs, as many as possible.
There are thousands of ideas and there are none which is absolutely right.
If you have concrete questions I think there are plenty of us who wants to help you.
There are thousands of ideas and there are none which is absolutely right.
If you have concrete questions I think there are plenty of us who wants to help you.
sholud
I invented a new word " sholud" maybe to much Rioja I also suffers from keyboard afasi, but I'm Ok now, peranders can you help me with the JC-2 problem hook an output stage with low imp driving capability it sholud be something like the erno class a buffer output I think he use mosfet right ? or... maybe it's better to try the Walt Jung discete opamp buffer the one with LED's.
Peter Daniel, yes I will check some Swedish pages and it would be nice if you check som Canadian pages and when we have done this we can mail each other to change some interesting about electronics. 🙂
I invented a new word " sholud" maybe to much Rioja I also suffers from keyboard afasi, but I'm Ok now, peranders can you help me with the JC-2 problem hook an output stage with low imp driving capability it sholud be something like the erno class a buffer output I think he use mosfet right ? or... maybe it's better to try the Walt Jung discete opamp buffer the one with LED's.
Peter Daniel, yes I will check some Swedish pages and it would be nice if you check som Canadian pages and when we have done this we can mail each other to change some interesting about electronics. 🙂
Re: sholud
Walter Jung's design is very universal. You can use any transistor type you like.
What data should the output stage have?
How much gain?
How low noise?
Maximum supply voltage etc.
Have you checked integrated buffers?
LT1010, BUF6xx etc. Check http://www.elfa.se since you live in Sweden.
Integrated buffers are quite OK if you are satisfied with their data.
leiade said:
Walter Jung's design is very universal. You can use any transistor type you like.
What data should the output stage have?
How much gain?
How low noise?
Maximum supply voltage etc.
Have you checked integrated buffers?
LT1010, BUF6xx etc. Check http://www.elfa.se since you live in Sweden.
Integrated buffers are quite OK if you are satisfied with their data.
IC audio amplifiers
No, no, no, I do not want any IC, I want a low impedance driver at the output of the JC-2 output amplifier wich consists of in my case two jfet dual devices like the 2sk389 and 2sj109 and output devices is the wellknown 2n4401 and 2n4403 I think that it would be nice to end this amplifier with a mosfet design á la Erno
the old German fet amplifier guru "TOGFAG".
If any can check the schematics of the JC-2 and help me with an upgrade with the above mentioned output I would appreciate it very much.
I think Erno use 2sk216 and 2sj79 but I'm not sure.😎
No, no, no, I do not want any IC, I want a low impedance driver at the output of the JC-2 output amplifier wich consists of in my case two jfet dual devices like the 2sk389 and 2sj109 and output devices is the wellknown 2n4401 and 2n4403 I think that it would be nice to end this amplifier with a mosfet design á la Erno
the old German fet amplifier guru "TOGFAG".
If any can check the schematics of the JC-2 and help me with an upgrade with the above mentioned output I would appreciate it very much.
I think Erno use 2sk216 and 2sj79 but I'm not sure.😎
Rioja
Oh no ! another bottle og Conde de Valdemar Reserva is on the table I have to run, if I don't get away I maybe invent some more peculiar words again like the "sholud" maybe this word can be the synonym for the JC-2 upgrade struggle.
Oh no ! another bottle og Conde de Valdemar Reserva is on the table I have to run, if I don't get away I maybe invent some more peculiar words again like the "sholud" maybe this word can be the synonym for the JC-2 upgrade struggle.
Re: IC audio amplifiers
Those devices are no longer in production if I'm not mistaken. If you don't have the transistors in mind yet, you must check if they are around nowadays. Many JFET's and MOSFET's are obsolete 🙁
leiade said:
Those devices are no longer in production if I'm not mistaken. If you don't have the transistors in mind yet, you must check if they are around nowadays. Many JFET's and MOSFET's are obsolete 🙁
something about making
As I am an elder swedish guy not so upp to date as many of the youngsters here on the Web I will yet remember a story about bulding railways in the world Swedish,Norwegian and Finnish was often the guys who made it, here is the story in swedish.
Förmannen till beställaren ge mig snus,mus och brännvin samt svenskar, norrmän och finnar och jag skall bygga en järnväg till helvetet.
Goodbye gentlemen🙂
As I am an elder swedish guy not so upp to date as many of the youngsters here on the Web I will yet remember a story about bulding railways in the world Swedish,Norwegian and Finnish was often the guys who made it, here is the story in swedish.
Förmannen till beställaren ge mig snus,mus och brännvin samt svenskar, norrmän och finnar och jag skall bygga en järnväg till helvetet.
Goodbye gentlemen🙂
JFET MOSFET
My last question before I fall off the chair, what !!!! is the devices Erno use in his class a design obsolete can't be true if so subsitute it with IRF devices and please go on with the upgrade.
Sholud😎
My last question before I fall off the chair, what !!!! is the devices Erno use in his class a design obsolete can't be true if so subsitute it with IRF devices and please go on with the upgrade.
Sholud😎
Tu be or tu be
Oh! No sirs I'm not a tube freak my synonym " Solid Junk" is just a protest against the solid state ******** designs that overwhelming the hifi world nowadays.😉
Oh! No sirs I'm not a tube freak my synonym " Solid Junk" is just a protest against the solid state ******** designs that overwhelming the hifi world nowadays.😉
I'm not mistaken.
That could never happen............ They are listed on Hitachi's website as in mass production. Thanks for your well researched advice, I am sure it was very helpful.
http://www.ceitron.com/semi/semi.phtml?part=2sk216
http://www.ceitron.com/semi/semi.phtml?part=2sj79
http://www.hitachisemiconductor.com/sic/servlet/request
That could never happen............ They are listed on Hitachi's website as in mass production. Thanks for your well researched advice, I am sure it was very helpful.
http://www.ceitron.com/semi/semi.phtml?part=2sk216
http://www.ceitron.com/semi/semi.phtml?part=2sj79
http://www.hitachisemiconductor.com/sic/servlet/request
OK, I was mistaken but ELFA here in Sweden has stopped selling them so at once it was a little bit harder to get them in Sweden with a reasonable low cost. My general advise is to check wether the transistors are available or not.
Re: JC-2 Tune up
See the following thread at AA for tune up of the JC-2 and to see what is really inside the modules.
http://db.audioasylum.com/cgi/m.pl?forum=tweaks&n=35230&highlight=elso+mpsu56&r=&session=
Finally my own JC-2 was so tuned up that it was literally my own design preamplifier. Then I went for the Shallco 47 position volume switch and sold the JC-2.😉
Hi Leiade,leiade said:
See the following thread at AA for tune up of the JC-2 and to see what is really inside the modules.
http://db.audioasylum.com/cgi/m.pl?forum=tweaks&n=35230&highlight=elso+mpsu56&r=&session=
Finally my own JC-2 was so tuned up that it was literally my own design preamplifier. Then I went for the Shallco 47 position volume switch and sold the JC-2.😉
tuning preamps
Hi Elso,
Can you show your jc-2 upgrade to this forum it woul be nice to se.
I have listened to a clone jc-2 for many years now and it's still working, but I wanted a remote controlled preamp so I bought a used Linn LK-1 and I must say this preamp has nothing do do in the high end area.
Lots of problems Ok it's old, the LK-1 was broken 5 -6 times I dont remember exactly, fortunatly I own a copy af the schematics, people!! lots of junk in this construction.
Maybe I can show some part of this LK-1 schematics here but I have to make xerox first I will show the output stage I think it is class A.🙂
Hi Elso,
Can you show your jc-2 upgrade to this forum it woul be nice to se.
I have listened to a clone jc-2 for many years now and it's still working, but I wanted a remote controlled preamp so I bought a used Linn LK-1 and I must say this preamp has nothing do do in the high end area.
Lots of problems Ok it's old, the LK-1 was broken 5 -6 times I dont remember exactly, fortunatly I own a copy af the schematics, people!! lots of junk in this construction.
Maybe I can show some part of this LK-1 schematics here but I have to make xerox first I will show the output stage I think it is class A.🙂
Shallco hm...
Hi Elso,
What's Shallco where can I buy it, how can I make a attenuator with this switch 47 positions! are you serious it sounds like something that's is comming from heaven.😱
Hi Elso,
What's Shallco where can I buy it, how can I make a attenuator with this switch 47 positions! are you serious it sounds like something that's is comming from heaven.😱
MOSFET
Peranders,
They are available in Sweden and the price is about $10 for a pair of 2sk216 and 2sj79.
Can you attach them to the JC-2 output it would be very nice to get lower driving capability to this eminent design.😎
Peranders,
They are available in Sweden and the price is about $10 for a pair of 2sk216 and 2sj79.
Can you attach them to the JC-2 output it would be very nice to get lower driving capability to this eminent design.😎
Linn LK-1
Leiade,
Very interested in the insides / schematics of the LK-1, if you can find the time to Xerox / Scan.
Andy.
Leiade,
Very interested in the insides / schematics of the LK-1, if you can find the time to Xerox / Scan.
Andy.
Re: Shallco hm...
http://db.audioasylum.com/cgi/m.pl?forum=tweaks&n=48637&highlight=shallco+elso&r=&session=
Please have a look at this post.😉leiade said:
http://db.audioasylum.com/cgi/m.pl?forum=tweaks&n=48637&highlight=shallco+elso&r=&session=
Re: tuning preamps
Rather than posting a complete ready to build schematic I invite you to study the links I provided.
Hi leiade,leiade said:
Rather than posting a complete ready to build schematic I invite you to study the links I provided.
- Status
- Not open for further replies.