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Old 3rd June 2009, 10:31 AM   #1
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Default Nikko Beta Ii

any body meet with a device like that before ???

i have some trouble with it and schematics will be very welcome

thanks
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 3rd June 2009, 11:28 AM   #2
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Default ooops

it seems that i have trouble in rail voltage that is supposed to be 29+29 volts ....

there exists a circuit with 3transistors per rail to stabilize from 45 volts to 29

i smell lm 317-337 replacement

any comments ????
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 3rd June 2009, 04:51 PM   #3
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Default Have a picture dear Sakis


This is interesting.... as we help you and you give us that gift..the chance to see the equipment inside.... you know.... two way gifts flowing...image from you to us..and schematic from us to you.

hehehehe.

Cheers.... this is a Brazilian food... called Feijoada.

Black beans, condimented with burned garlic, salt, portuguese sausage, fat from pig (bacon) and jerked beef.... a slave food that we appreciate a lot together spinach (with greek Olive oil) and white rice.... also oranges in slices or orange juice goes fine together.

I wish you health together Maria and your little Sakis that will be comming very soon.

Carlos
Click the image to open in full size.
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Old 3rd June 2009, 10:55 PM   #4
lineup is offline lineup  Sweden
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Sometimes I do not know what is in the head of posters.
I hear that people have too much sun on head
can make BRAIN cooking and they start have hallucinations.

---




sakis
3 Transistors to regulate down from 45V to 29V
.. sure it can be done.

Even by using cascaded two LM337
Search forum, you may find such low noise regulators..

45 Volt -> LM317 -> ->LM317 29 Volt

/linie your audio friend
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Old 4th June 2009, 12:33 AM   #5
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Default The man was frozzen last winter,when defrosted turn this way.... having some bad mood


Here is the google translator... very strange:

"The good man froze this past winter .. when thaw was so bad tempered "

Tell this gentleman, please dear Sakis, that i am welcome here...a special visitor... and that i am sending him a friendly hug.

ahahahahah!

he is not reading my mails.... mad with uncle charlie.

regards,

Carlos

.................................................. ....................................

Hey Sakis..tell us something about that pre amplifier!
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Old 4th June 2009, 07:08 AM   #6
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Quote:
Originally posted by lineup

Sometimes I do not know what is in the head of posters.
I hear that people have too much sun on head
can make BRAIN cooking and they start have hallucinations.


sakis
3 Transistors to regulate down from 45V to 29V
.. sure it can be done.

Even by using cascaded two LM337
Search forum, you may find such low noise regulators..

45 Volt -> LM317 -> ->LM317 29 Volt

/linie your audio friend
Dear line up .....

since upgrades and repairs is something we doo every day in my shop and also if possible we like to make wquipment as better is possible there is a chance to repair the amplifier by simply changing a 2SA945 that was shorted and keep the totaly 6 transistor /2zener/few resistor and caps that will provide +28.5 and - 29.6 rails ....

the question was that if a pair of lm317-337 will provide more clean and more acurate rails of exactly 29.0 volts which i find not really importand

then the question is if the peower is cleaner through that and secondary more acurate

easy now LIne up ..... im not 15.... i am 43 and i am dealing with electronics since i was a kid so let us make this post ...usefull


amlifiers i make worked for 100 years .... so i consider my shelf a higly skilled technician <<<< i have solid proof of that >>>>
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 4th June 2009, 08:55 AM   #7
fotios is offline fotios  Greece
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Hi friends

LM317-337, can be used with safe if Vo-Vi<=40V. In your case Saki, 45-29=16V it is a very safe difference. The issue with LM317-337 it is that their output it is clean, up to 18V. Above 18V, 317-337 presents signifficant ripple. For eliminating the ripple, a transistor (BD139-140) must be connected (common base configuration) in their output as a constant current source.

Regs
Fotios
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Old 19th March 2010, 06:45 AM   #8
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Good morning from Paris,

I m looking for service manual for Nikko beta 2 do you know where i can find it?

Merci
Cordialement
Philippe
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