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Author Topic: Help, conversion problem.  (Read 3842 times)
riverman
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« on: July 26, 2010, 03:51:50 PM »
Hello,
         I was upgrading my 50 W ods to 100 W, added the 2 extra octal sockets and components and got the 100 W power and output transformers. Switched it on and heaters working fine, but when standby switch was switched on a high pitched squeal came from the speakers. Replaced the original transformers but still getting the high pitched squeal, even with all controls at zero. Replaced all the valves, checked lead dress etc, but no joy. Any help appreciated.

riverman.
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JD0x0
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« Reply #1 on: July 26, 2010, 05:39:30 PM »
switch the output transformer leads. Reverse them and it should solve the problem
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It's true i've lost my marbles and i can't remember where i put them.
hywelg
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« Reply #2 on: July 26, 2010, 07:30:33 PM »
I reckon this should be in a FAQ page on Niks site. You have a 50-50 chance of getting it wrong and once you know its easy to fix.

Two out of three of my builds suffered that way.
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riverman
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« Reply #3 on: July 26, 2010, 07:39:30 PM »
Thanks JDOxO  and hywelg that solved the problem. Did not realise that they were polarity concious.

riverman
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