After reading your question, my first thought was that you may have a shorted transformer. Specifically a short of the primary to the core or possibly to the secondary, assuming the secondary common is grounded.
On second reading you mention isolating "them" meaning two (2). Is this a stereo amp, and do both transformers cause a short? If so, perhaps you have made a wiring error. What are we dealing with here? Push-Pull or singel ended? What transformers are you using and where did they come from?
Output transformers should never need isolation from the chassis or ground.
Victor
On second reading you mention isolating "them" meaning two (2). Is this a stereo amp, and do both transformers cause a short? If so, perhaps you have made a wiring error. What are we dealing with here? Push-Pull or singel ended? What transformers are you using and where did they come from?
Output transformers should never need isolation from the chassis or ground.
Victor
A few simple measurements with a DMM should tell you if you have a short and where it is. Measure primary to core, primary to secondary, and secondary to core. You should see an open circuit in all cases.
It might be possible that a shorted primary will not show up without high voltage on the core. That can be measured (very carefully) by checking the voltage from core to ground with the transformer isloated from the chassis and power on. Before you do that, though, you might remove the bells and check that you don't have an obviously pinched wire.
Sheldon
It might be possible that a shorted primary will not show up without high voltage on the core. That can be measured (very carefully) by checking the voltage from core to ground with the transformer isloated from the chassis and power on. Before you do that, though, you might remove the bells and check that you don't have an obviously pinched wire.
Sheldon
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