How to Diagnose a Bad Output Transformer: 1997 Marshall JCM 900 50W Hi Gain Dual Reverb 4500 Circuit

Quick diagnosis of a bad output transformer in a1997 Marshall JCM 900 50W Hi Gain Dual Reverb 4500 Circuit 5881 Power Tubes
Mike Menditto from Menditto Amplification/Maggio Music Center finds definitive proof that a 1997 Marshall JCM900 has a faulty output transformer.
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