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Hi [message #8910] Mon, 24 September 2007 13:17 Go to next message
stevem is currently offline  stevem
Messages: 4775
Registered: June 2004
Location: NY
Senior Member
Hi, most hiss issuse with these amps are due to the small to92 type black case transistors going.
Since both channels are noisy, it must be in a transistor in the pre- driver section of the board, or at least that would be my first guess.
These transistors are so darn cheep these days that you can but 10 of them for under 50 cents each or less, so it would pay to change them.
Also replacing the first three in each channel will make for less hiss.

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Re: Hi [message #8914 is a reply to message #8910] Mon, 24 September 2007 17:00 Go to previous messageGo to next message
ianb is currently offline  ianb
Messages: 13
Registered: July 2007
Location: tennessee
Junior Member
stevem wrote on Mon, 24 September 2007 13:17

Hi, most hiss issuse with these amps are due to the small to92 type black case transistors going.
Since both channels are noisy, it must be in a transistor in the pre- driver section of the board, or at least that would be my first guess.
These transistors are so darn cheep these days that you can but 10 of them for under 50 cents each or less, so it would pay to change them.
Also replacing the first three in each channel will make for less hiss.



steve,
i'm assuming this is a reply in reference to my hissy k100 thread?
what transistors do you suggest i use for replacemnts?

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Re: Hi [message #8917 is a reply to message #8910] Tue, 25 September 2007 06:32 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4775
Registered: June 2004
Location: NY
Senior Member
Yes. I do not know how it wound up being posted seperate from where I replyed to you?

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Re: Hi [message #8924 is a reply to message #8917] Tue, 25 September 2007 17:38 Go to previous messageGo to next message
ianb is currently offline  ianb
Messages: 13
Registered: July 2007
Location: tennessee
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hahaha..
no idea man.gotta love the wonders of the internet sometimes Smile

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Re: Hi [message #8925 is a reply to message #8910] Wed, 26 September 2007 14:03 Go to previous messageGo to next message
DaveK
Messages: 5
Registered: May 2004
Location: Indian Head, Maryland
Junior Member
Hi,

Can you tell where I can get transistors for under 50 cents each? I have a K100-2 and a K200B-5 that needs similar work.

Thanks!

DaveK

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Re: Hi [message #8926 is a reply to message #8910] Wed, 26 September 2007 14:04 Go to previous messageGo to next message
DaveK
Messages: 5
Registered: May 2004
Location: Indian Head, Maryland
Junior Member
Hi,

Can you tell where I can get transistors for under 50 cents each? I have a K100-2 and a K200B-5 that needs similar work.

Thanks!

DaveK

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Re: Hi [message #8927 is a reply to message #8910] Thu, 27 September 2007 06:32 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4775
Registered: June 2004
Location: NY
Senior Member
Mouser electronics carrys 2n3904s and souch for 27 cents each if you buy 10.
I think even the shack carrys a pack of ten for around that price.

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Re: Hi [message #8928 is a reply to message #8927] Thu, 27 September 2007 16:45 Go to previous messageGo to next message
ianb is currently offline  ianb
Messages: 13
Registered: July 2007
Location: tennessee
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steve,
are they npn or pnp?

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Re: Hi [message #8929 is a reply to message #8910] Fri, 28 September 2007 06:42 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4775
Registered: June 2004
Location: NY
Senior Member
If you have transistors marked pet8004, or se4002, these are npn type 2n3904, or NTE brand 123ap.
A 2n3638, which is the second transistor in the preamp section crosses to a NTE 129 which is A PNP type.
If you go to the NTE web site, they have a cross over you can use to get current numbers.

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icon14.gif  Re: Hi [message #8931 is a reply to message #8929] Fri, 28 September 2007 22:31 Go to previous message
ianb is currently offline  ianb
Messages: 13
Registered: July 2007
Location: tennessee
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thanks man

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