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If you had to guess

74.47.217.143
Posted on June 7, 2015 at 11:15:42
Awe-d-o-file
Dealer

Posts: 21037
Location: 50 miles west of DC
Joined: January 10, 2004
 My buddy powered up his KX-200. Nothing. The fuse is good. Are these units known for power transformer problems? It could be other things like the switch etc, just wondered if anyone knows.

E
T

ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

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All the tubes' heaters working? (n/t), posted on June 7, 2015 at 14:08:55
FenderLover
 mt

 

Nope, posted on June 7, 2015 at 14:27:05
Awe-d-o-file
Dealer

Posts: 21037
Location: 50 miles west of DC
Joined: January 10, 2004
 no tubes are lighting up. He switched some 12AX7's from it to another working amp and they were fine. So switch, power transformer. He just showed up with it as I was posting. Bad power switch.

E
T

ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

RE: Nope, posted on June 11, 2015 at 03:42:20
Brian Levy
Audiophile

Posts: 2438
Location: Toronto
Joined: June 5, 2000
 Just guessing. Could be lots of things. You need to start checking voltages. Be careful as the voltages are very high and can be dangerous. He likely would be better off and should take it to a tube tech for repair. Sometimes someone with little experience can destroy a unit that needed only an inexpensive repair.
Don Brian Levy, J.D.
Toronto ON Canada

 

RE: Nope, posted on June 11, 2015 at 07:38:35
Awe-d-o-file
Dealer

Posts: 21037
Location: 50 miles west of DC
Joined: January 10, 2004
 Thanks Brian. I was surprised that it was just the power switch (stacked on back of the volume pot) I've not seen one of those go yet. I've been repairing various types of tube gear for 25+ years. I do however feel that the first time you work on a particular unit you are at a distinct disadvantage. I feel this way about changing the brakes on a vehicle for the first time too. You gain so much actually working on the exact unit. When I was a bench tech I got so much better working a particular model after I had done about ten of them.

I've pulled one leg on all the components and checked the resistors with a VOM and the caps with an ESR meter too. He wants a total restore as he is keeping it not flipping it. Most of the original 12AX7's are weak or one side bad, and I need to test the 7591's this weekend on my friends tester as mine won't test them.

I took apart my first Macbook to repair it the other night and I can tell you the next one won't take 1/4th the time to disassemble. Thanks for chiming in. I used to have to repair various hand held and long pole high voltage probes for electric companies so I've fooled with, respect and know how to deal with quite high voltages.

E
T


ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

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