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Hi [message #8910] Mon, 24 September 2007 13:17   stevem Messages: 4733 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. Report message to a moderator

Re: Hi [message #8914 is a reply to message #8910] Mon, 24 September 2007 17:00   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? Report message to a moderator

Re: Hi [message #8917 is a reply to message #8910] Tue, 25 September 2007 06:32   stevem Messages: 4733 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? Report message to a moderator

Re: Hi [message #8924 is a reply to message #8917] Tue, 25 September 2007 17:38   ianb Messages: 13 Registered: July 2007 Location: tennessee Junior Member hahaha.. no idea man.gotta love the wonders of the internet sometimes Report message to a moderator

Re: Hi [message #8925 is a reply to message #8910] Wed, 26 September 2007 14:03 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 Report message to a moderator

Re: Hi [message #8926 is a reply to message #8910] Wed, 26 September 2007 14:04 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 Report message to a moderator

Re: Hi [message #8927 is a reply to message #8910] Thu, 27 September 2007 06:32   stevem Messages: 4733 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. Report message to a moderator

Re: Hi [message #8928 is a reply to message #8927] Thu, 27 September 2007 16:45   ianb Messages: 13 Registered: July 2007 Location: tennessee Junior Member steve, are they npn or pnp? Report message to a moderator

Re: Hi [message #8929 is a reply to message #8910] Fri, 28 September 2007 06:42   stevem Messages: 4733 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. Report message to a moderator

Re: Hi [message #8931 is a reply to message #8929] Fri, 28 September 2007 22:31   ianb Messages: 13 Registered: July 2007 Location: tennessee Junior Member thanks man Report message to a moderator

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