Outspoken radio host and former teacher Alan Jones has pleaded not guilty to dozens of sexual abuse charges after several charges against him were withdrawn.

The 84-year-old had been accused of historical sex offences against 11 people - the youngest of whom was 17 at the time - over two decades when he dominated Sydney's airwaves.

He was facing a total of 35 charges of sexual abuse before prosecutors added charges against him earlier this week.

But the landscape of the case changed again on Thursday when prosecutors withdrew more than a dozen charges and amended remaining counts in the Downing Centre Local Court.

Jones now faces 25 charges of indecent assault and two of sexual touching against nine alleged victims.

Prosecutors did not explain in court why the charges related to two

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