Sony TA-F440E (F540E) amplifier with mysterious faults and a history.

Working on a Sony TA-F440E (F540E) amplifier which appears to have been "got at". Why has someone done a horrendous hack to this amplifier and what was the original fault that they were trying to work around? Sony released a terrible service manual with errors and lack of detail. Audio and video transfers: https://www.video99.co.uk/ Please support us on Patreon   / video99couk   or Paypal to colin@video99.co.uk Music “Let It Run” with permission, copyright Cristie/MacFarlane.