K200A-1 head, no output to speaker cab [message #22430] |
Wed, 11 February 2015 05:47 |
ToddMcD
Messages: 2 Registered: February 2015 Location: United States
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Junior Member |
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I have a K200A-1 head that isn't output to a speaker cab. I've owned it for 17 years or so, it hasn't worked for the last 10 or so. It blew fuses. I checked the transformer, rectifier, and capacitors. They were OK, put them back in and now it doesn't blow fuses anymore. Now it doesn't have any output to a speaker cab. There's a buzzing but no other sound. Any ideas or some schematics for it would be great.
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Re: K200A-1 head, no output to speaker cab [message #22433 is a reply to message #22430] |
Wed, 11 February 2015 13:14 |
chicagobill
Messages: 2005 Registered: April 2003
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Senior Member |
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Welcome to the place.
Agree with Steve, usually fuses don't blow for no reason.
If you go over to the Technical part of the site, you will find some schematics for the K200A series amps. You should be able to at least find the power amp and the preamps.
If you have any other questions feel free to ask.
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Re: K200A-1 head, no output to speaker cab [message #22435 is a reply to message #22430] |
Wed, 11 February 2015 18:07 |
stevem
Messages: 4772 Registered: June 2004 Location: NY
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Senior Member |
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Yiu are reading over 500 ohms because that 5 watt resistor is open and that bring open also means you have at least one bad output transistor and may be also a bad driver transistor.
The first step is to remove that bad 5 watt emitter resistor and replace it, but while you are at it you may as well replace all 4 as newer ones will be much closer to the resistance that they should be and then we can help you repair the rest of what's wrong!
Do not power up the just because you have replaced those resistors!
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