Michael Souter, 60, who was based at BBC Norfolk, was yesterday found guilty of 19 sex offences.
They include indecent assault, indecency with a child and serious sexual offences against seven boys aged between 11 and 16 between 1979 and 1999.
Judge Mark Lucraft warned him at Norwich Crown Court that he will face a lengthy jail sentence when he is sentenced later this month.
Souter, originally from East Dunbartonshire, now lives in Loddon, Norfolk.
He used his celebrity to prey on "young and pliable" victims he met through his work.
Prosecutors described Souter, who was also involved in the Scouts and a social services youth mentoring scheme, as a "sexual deviant" who was obsessed with young boys in shorts and uniform.
He was also convicted of seven counts of making and possessing indecent images of under-18s.
Jurors failed to reach a verdict on one count of indecent assault on a male and have also cleared him of one charge of possessing an indecent photograph of a child.
Norfolk Police confirmed an inquiry was continuing into more claims. Almost 600 people have been identified as witnesses and it is understood a number of these have raised concerns about Souter's behaviour.
A police spokeswoman said: "Anyone who may be affected by anything raised during this trial can contact police. Norfolk Constabulary is committed to working with partner agencies to prevent child sexual exploitation, support victims and bring offenders to justice."
One former BBC employee from the 1980s said many people had long held suspicions about Souter.
He added: "One of the first rules I was told when I started at the BBC was: 'Never be in a room alone with Mike Souter.'"
A BBC spokesman said Souter's crimes were "truly shocking and the BBC condemns them in the strongest possible terms."
The corporation said Souter had not worked for it since the early 1990s.
Another alleged male victim told police in 2002 he had been raped by Souter two years earlier when he was aged 17.
He claimed the presenter, a friend of his parents, had invited him to his house and got him drunk before raping him.
Detectives decided there was insufficient evidence to proceed but three days after the man's mother contacted officers, the family received a letter from Souter threatening legal action.
He wrote: "I have now heard from three separate sources that he is saying dreadful things about me in public, things that, if I didn't know and sympathise with [his] problems, would certainly lead to a writ being issued for defamation."
The man, who cannot be named for legal reasons, said: "I met Mike through my parents and he was a kind of mentor, helping me set up my own business.
"I thought he was the best thing since sliced bread - his was a world I aspired to be part of.
"When he raped me I was left confused and assumed I was the only one."
Souter is the latest current or former BBC presenter to become embroiled in sex-assault allegations. Former Top of the Pops host Jimmy Savile was a predatory sex offender with hundreds of victims.
It's A Knockout's Stuart Hall is serving a 30-month jail sentence for abuse. Rolf Harris has denied charges of indecent assaults and making indecent images of a child. Former Radio 1 DJ Dave Lee Travis faces trial over 14 sex offence allegations which he denies.