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k200-b1 [message #25098]

Mon, 20 June 2016 13:54

bowalk6
Messages: 2
Registered: June 2016
Location: jersey

Junior Member

Get low rumble hash when no input full volume.When instr plugged in more
hi end hash with instr full volume disappears when volume off. Measurements on se4002 c 7.02 e -1.1 b -6.5 any ideas?
Thanks
Bob

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Re: k200-b1 [message #25099 is a reply to message #25098]

Mon, 20 June 2016 14:19

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

Just from the noise you describe It would seem that the first or second transistor off of that preamp boards input jack(s) is going bad.
I would replaced them both in one shot since there cost is under 25 cents.

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Re: k200-b1 [message #25100 is a reply to message #25099]

Mon, 20 June 2016 14:23

bowalk6
Messages: 2
Registered: June 2016
Location: jersey

Junior Member

Thanks for the quick reply
Will do
Bob

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Re: k200-b1 [message #25101 is a reply to message #25098]

Mon, 20 June 2016 14:26

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

There is also a 33 uf Tantalum blocking cap feeding the volume pot that could be going leaky and suspect too.
In general all the Tantalum caps in the amp are of the age where they will be going fully south if not we'll on the way already!

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