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Kustom 200B-4 help [message #15533]

Sun, 17 April 2011 18:14

sunnhead
Messages: 221
Registered: June 2010
Location: Minnesota

Senior Member

I have a 200B-4 with a white noise hiss problem, where does this come from, its not in the preamp section, possibly in the power amp transistors? anyone have a schematic they can send me?

-Steve

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Re: Kustom 200B-4 help [message #15534 is a reply to message #15533]

Sun, 17 April 2011 19:15

Kustom_Bart
Messages: 601
Registered: October 2010
Location: Greenville, MichiGUN

Senior Member

Is it different than the normal Kustom hiss?

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Re: Kustom 200B-4 help [message #15535 is a reply to message #15534]

Sun, 17 April 2011 19:17

sunnhead
Messages: 221
Registered: June 2010
Location: Minnesota

Senior Member

Yes it is way louder, somthing isn't right.

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Re: Kustom 200B-4 help [message #15536 is a reply to message #15533]

Sun, 17 April 2011 23:09

Kustom_Bart
Messages: 601
Registered: October 2010
Location: Greenville, MichiGUN

Senior Member

Did you try cleaning the connectors on the boards? I had this work on one of mine. Is this on the new beauty?

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Re: Kustom 200B-4 help [message #15537 is a reply to message #15536]

Sun, 17 April 2011 23:59

sunnhead
Messages: 221
Registered: June 2010
Location: Minnesota

Senior Member

yep it is, ill try that out!

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Re: Kustom 200B-4 help [message #15538 is a reply to message #15533]

Mon, 18 April 2011 12:50

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

PM your email address to me and I'll get the schematics to you.

As for your hiss, There are no connectors in a K200B head. The Molex connectors didn't start until the Metal front amps.

Why do you think that it's not in the preamp? I've fixed a lot of Kustom heads. Some were hissier than others. Unfortunately I have found that there as many reasons for the hiss as there are parts in the amp. On some heads it's transistor related, on others it's resistor or capacitor related, you just never know. My general rule of thumb is that transistors are first, followed by resistors and capacitors.

Try and isolate the problem. Take an RCA cable and plug it into the jack on the back of the head. This will give you the signal from the preamps. Is there a lot of hiss at this point?

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