Victor Campbell, 66, of Thomas Place in Warrnambool, pleaded guilty in Warrnambool Magistrates Court to being a sex offender engaged in child-related employment.

Magistrate John Lesser told Campbell the sex offenders' register involved strict requirements and he had breached them.

Mr Lesser convicted and fined Campbell $400 but warned him the matter would become more serious if he returned to court.

Police said Campbell was placed on the sex offenders' register for eight years after appearing in court in 2009.

He had the many obligations of being on the register explained to him in May last year during a review including that he had to report any contact with children.

The court heard that Campbell provided tuition across three sessions to a teenage girl.

The sessions occurred between August 25 and November 12 last year at the girl's house while her parents were at home.

The girl and Campbell were in a room alone during the tuition.

Campbell said in a police interview he now better understood the obligations of the register and it never occurred to him that he was breaching the rules. 

Defence counsel Matt Senia said the girl's father contacted Campbell about providing tuition. He said nothing happened between Campbell and the girl.

Mr Senia said Campbell had experienced success within his career. 

He worked as a youth guidance officer for a number of years and in 1987 had his own Christian music program on ABC radio. 

He then worked in the United States and one artist under his guidance won a Grammy award. In 1999 he returned to teaching but in 2008 was involved in an incident with a teenage girl he was counselling.

Mr Senia said his client made a “terrible error of judgement” which led to him being placed on the register. 

"That was the end of his teaching career," Mr Senia said.

Campbell moved to Warrnambool 18 months ago to be closer to his daughter and his grandchildren. 

As well as being involved in Warrnambool’s Aus Music Festival committee in the past, Campbell has been a music industry consultant.