Help for repair my KSA 100 - Page 6

Alex helge · 2nd September 2003, 12:30 PM

Hi ben goh,
Many thanks for your answer.
Is the mosfet IRF 610 and 9610 better as the old mosfet typ.
Must I machting the new mosfet IRF 610 and 9610
Best regards
Alex

kevin gilmore · 2nd September 2003, 12:30 PM

Actually the direct replacements according to the book
are irf9612 and irf612. Enhancement mode fets used
as current sources. In this case the Rds is important.

These are not so easy to get either.

peranders · 2nd September 2003, 12:35 PM

Quote:

Originally posted by kevin gilmore
Actually the direct replacements according to the book
are irf9612 and irf612. Enhancement mode fets used
as current sources. In this case the Rds is important.

These are not so easy to get either.

Are you really sure about the Rdson? Isn't this parameter ONLY important if the mosfet is saturated (not in normal use as current source)?

Alex helge · 2nd September 2003, 01:06 PM

Hi,
Must matching the fet´s IRF 9612 and 612 for KSA 100 ?
Alex

mrfeedback · 2nd September 2003, 01:23 PM

Alex,
Why do you bother about fets ?.
Typically you will find that the output transistors, maybe driver transistors and maybe emitter resistors only are blown - it is rare for damage to go further back.
Your friend should know what a variac is - use one to run up the amp whilst monitoring bias current one channel powered at a time.
If you need more info just ask.

Eric.

jewilson · 3rd September 2003, 07:12 PM

Eric is correct,

The parts that get damaged or the or the NPN and PNP outputs emmiter reisstors and maybe the bias transistor. Do not get concerned about the front end of the amp.

In addition, many companies still sale these components. You just need to search the Internet for the companies. These are still a market for discontinued transistors.

Alex helge · 4th September 2003, 05:41 PM

Hi,
Where can I buy the dale resistors and the Panasonic FC Serie at Germany?
Dale CMF 60 75R0F
Panasonic FC 105C 1000uf/16 Volt
I have by ten dealers to ask.
No Dale resistors and Panasonic capacitors
Best regards Alex

Taco · 4th September 2003, 06:17 PM

For panasonic check http://www.schuro.de/preisl-pana-fc.htm

Alex helge · 4th September 2003, 06:42 PM

Hi
NO! undeliverable by Schuro.de
By by Alex

Alex helge · 5th September 2003, 12:27 AM

Hi
Can me to sell anyone the Dahl resistor RN60D 75R0F or CMF 60
75R0F ?
Alex

2nd September 2003, 12:30 PM	#51
Alex helge diyAudio Member Join Date: Oct 2002 Location: Germany	Repair my KSA 100 Hi ben goh, Many thanks for your answer. Is the mosfet IRF 610 and 9610 better as the old mosfet typ. Must I machting the new mosfet IRF 610 and 9610 Best regards Alex

2nd September 2003, 01:06 PM	#54
Alex helge diyAudio Member Join Date: Oct 2002 Location: Germany	matching fet for KSA 100 Hi, Must matching the fet´s IRF 9612 and 612 for KSA 100 ? Alex

2nd September 2003, 01:23 PM	#55
mrfeedback diyAudio Member Join Date: Feb 2002 Location: Perth, Australia.	Alex, Why do you bother about fets ?. Typically you will find that the output transistors, maybe driver transistors and maybe emitter resistors only are blown - it is rare for damage to go further back. Your friend should know what a variac is - use one to run up the amp whilst monitoring bias current one channel powered at a time. If you need more info just ask. Eric. __________________ I believe not to believe in any fixed belief system.

3rd September 2003, 07:12 PM	#56
jewilson diyAudio Member Join Date: May 2002 Location: Plano , TX	Damaged Parts Eric is correct, The parts that get damaged or the or the NPN and PNP outputs emmiter reisstors and maybe the bias transistor. Do not get concerned about the front end of the amp. In addition, many companies still sale these components. You just need to search the Internet for the companies. These are still a market for discontinued transistors. __________________ Jim W.

4th September 2003, 05:41 PM	#57
Alex helge diyAudio Member Join Date: Oct 2002 Location: Germany	Parts for repair Hi, Where can I buy the dale resistors and the Panasonic FC Serie at Germany? Dale CMF 60 75R0F Panasonic FC 105C 1000uf/16 Volt I have by ten dealers to ask. No Dale resistors and Panasonic capacitors Best regards Alex


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2nd September 2003, 12:30 PM	#52
kevin gilmore diyAudio Member Join Date: May 2002 Location: wheeling illinois	Actually the direct replacements according to the book are irf9612 and irf612. Enhancement mode fets used as current sources. In this case the Rds is important. These are not so easy to get either.

4th September 2003, 06:17 PM	#58
Taco diyAudio Member Join Date: Nov 2002 Location: Place in the Netherlands	For panasonic check http://www.schuro.de/preisl-pana-fc.htm

4th September 2003, 06:42 PM	#59
Alex helge diyAudio Member Join Date: Oct 2002 Location: Germany	Parts on KSA Hi NO! undeliverable by Schuro.de By by Alex

5th September 2003, 12:27 AM	#60
Alex helge diyAudio Member Join Date: Oct 2002 Location: Germany	Dahl Resistors Hi Can me to sell anyone the Dahl resistor RN60D 75R0F or CMF 60 75R0F ? Alex

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