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Old 25th August 2009, 07:41 AM   #11
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Yes because of the fin on collector i discovered the wrong placement of my replacement transistors: 2SA1011/2SC2344

Thanks all for reply. I will revive a 7ties Sony amp in a short momentand hope my work is done tidy.
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Old 25th August 2009, 07:55 AM   #12
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tubee,
what output devices are used in that amp?
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Old 25th August 2009, 08:51 AM   #13
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Sony Vfets 2SJ18/2SK60 cascaded with transistors. Replaced the bipolar transistors with D44H8/D45H8, so it should drive an 4 ohm load. It is the TA-N7B amp.
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Last edited by tubee; 25th August 2009 at 08:54 AM.
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Old 25th August 2009, 08:59 AM   #14
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Quote:
Originally Posted by tubee View Post
I am searching for the pin order of these transistors. Searched some while on www no result.

Anyone?
SONY 2SA835 can replace through Motorola MPS-U60
SONY 2SC1663 can replace through Motorola MPS-U10

pinout and outline is the same by all types - go to

http://pdf1.alldatasheet.com/datashe...A/MPS-U10.html
http://pdf1.alldatasheet.com/datashe...A/MPS-U60.html

This information I read in the same order by follow comparsion table books in German Language
1) ECA "tvt transistoren2 '79/80
2) JAEGER ELEKTRONIK Vergleichstabelle 2001

Last edited by tiefbassuebertr; 25th August 2009 at 09:02 AM.
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Old 25th August 2009, 09:42 AM   #15
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tubee,
Quote:
Sony Vfets 2SJ18/2SK60 cascaded with transistors.
Nice devices in a nice configuration. Are you sure that all of them are defective?
Anyway, it`s going to be a degrade not an upgrade.
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Old 25th August 2009, 10:04 AM   #16
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I am busy with this beast for a year now. 1 fet was burned and 2 drivertransistors and 1 cascaded transistor.

I replaced the cascade transistors to heavier ones, they are the cause of Vfet failure, and want to prevent expensive obsolete Vfet frying again.

All caps are replaced except the big Lytics, all fusible resistors and some diodes/zeners.

So if someone has (a supplier for) Nippon Chemicon 27000uF/80V lytics.
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Old 25th August 2009, 11:11 AM   #17
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Suggestion #1
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Old 25th August 2009, 05:30 PM   #18
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Click the image to open in full size.

I rather like to keep the Vfets.
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Old 25th August 2009, 10:08 PM   #19
tubee is offline tubee  Netherlands
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Well i have done all work right, the Sony is revived again after so many years.

Click the image to open in full size.
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Old 25th August 2009, 11:28 PM   #20
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tubee,
congratulations.
Quote:
I rather like to keep the Vfets.
Of course.
Quote:
So if someone has (a supplier for) Nippon Chemicon 27000uF/80V lytics
A different brand should do as well, the higher capacitance the better.
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