The phone, computer and camera contained 3,161 child abuse images, including 810 at the most serious level, some showing rape.
The horrifying library included 62 hours of videos and some of the vulnerable young victims were babies.
Prosecutor Harry Hadfield gave harrowing descriptions of some of the worst pictures.
He said officers found another 40,293 “ungraded” images on Kydd’s devices.
He added: “There is evidence that this defendant deliberately searched for images portraying child sexual abuse.”
Kydd had not tell police about the devices or provide them for inspection, as he should have done under a sexual harm prevention order (SHPO).
He had also used his foster mother’s details to obtain a £17,000 loan in her name, then spent the money himself.
Kydd, of Raithwaite Close, Guisborough, admitted three charges of making indecent photographs of children, three of breaching the SHPO and one of fraud.
The court was told of his record of 29 crimes, starting with fraud and stealing from an employer in 2008.
He was jailed for two-and-a-half years in 2009 for sexual activity in the presence of a child and making indecent images of children.
He was given a three-and-a-half-year sentence in 2013 and five years in 2015 for having more indecent images of children and breaching his SHPO.
He was locked up for two years in May last year for yet more SHPO breaches – taking a trip to Amsterdam, opening a bank account and having the Note device without telling police, and stealing blank cheques from his mother.
That case saw him recalled to serve the rest of his five-year term from 2015, and further investigations uncovered the latest offences.
Judge Simon Bourne-Arton QC, the Recorder of Middlesbrough, said: “You have a very bad record, Mr Kydd.
“You had clearly a deeply unhealthy interest in children of a very young age.
“And here you are now before me in relation to a large number of images.
“There were 40,000 other images were weren’t categorised. A huge number of images in respect of children.”
Kydd was jailed for six-and-a-half years and given a new indefinite SHPO.
Guisborough sex offender jailed for secret trip to Amsterdam
A CONVICTED sex offender who breached court orders by travelling to Amsterdam is back behind bars.
When police visited Damien Kydd’s home after hearing of his overseas trip, they found cannabis and amphetamine.
Officers also discovered he had got a new mobile phone with internet access and opened a bank account without telling them – also in breach of restrictions first imposed when he was jailed in 2009.
Kydd, 33, from Guisborough, east Cleveland, had also stolen three cheques from his foster mother last month, prosecutor Emma Atkinson told TeessideCrown Court.
Judge Peter Armstrong heard how he first appeared in court in 2008 for fraud and stealing cheques from his employer and was given a community order.
The following year, Kydd was locked up for two years for offences of sexual activity in the presence of a child and possessing indecent images.
In 2013, he was jailed again for having more pictures of child abuse on a mobile phone found under a sofa, and breaching orders designed to curb his perverted behaviour.
And in 2015, he was given five years for yet further indecent images offences and flouting the court restrictions.
Miss Atkinson told the court that Kydd travelled to London in February and took the Eurostar train to France before going to Amsterdam and returning on a ferry to North Shields.
One of the requirements of him being on the sex offenders’ register is that he has to tell police of any plans to leave the UK at least seven days before he goes.
Sarah Lish, mitigating, said it was “unfortunate” that he had breached the Sexual Harm Prevention Order (SHPO) three times earlier, and added: “He can only apologise for falling foul of it again.”
Kydd’s foster mother, 76, who has brought him up since he was a baby, was said to be devastated by the theft of the cheques.
Miss Atkinson said: “She has always been there for him. Clearly, this has had an impact in her.
“She has stood by him through all his sexual offences and all she has done is support him through his life. She survives on a pension.”
Miss Lish told the court: “There is no suggestion that his time abroad was anything other than a short break in the usual way.
“He and his mother are now back on speaking terms, and she has contacted him while he has been in DurhamPrison [on remand, since his arrest].
“He accepts that his behaviour has caused her some significant upset, and fully accepts she has been nothing but supportive of him throughout his offending behaviour.
“He is trying to make amends. He says their relationship is not what it used to be yet, but he is hopeful with time they will get back to where they were before.”
Kydd, of Helmsley Drive, Guisborough, admitted two charges of failing to comply with notification requirements, breaching the SHPO, theft, and two counts of possessing Class B drugs.
Judge Armstrong told him: “This sort of behaviour seems compulsive as far as you are concerned. Previous prison sentences haven’t prevented you from carrying on.