A later Pentecostal convert, Allen’s life and methods were not without controversy and as with many of the other tent evangelists, he was the recipient of much criticism and personal scrutiny. At age 59, in June of 1970, he died from liver failure brought on by acute alcoholism in San Francisco, and was buried at his evangelistic headquarters in Miracle Valley, Arizona.
While attending an Oral Roberts tent meeting in Dallas (1949), Allen was convinced that a great revival was ahead and that God was moving across the land with displays of great power. Allen later testified that as he left that meeting, he was filled with such conviction for the lost to receive God's miracle-working power that he asked his church board to allow him to start a radio program. They refused. Allen soon resigned from his church and began to hold revivals, and it would be during this point that Allen started his Healing Revival Campaigns.
Allen was arrested in 1955 for suspicion of drunk driving in Knoxville, Tennessee and was defrocked by the Assemblies of God. After he "jumped bail" he re-ordained himself and set up the "Miracle Revival Fellowship".
Allen continued on the revival circuit, and in 1958 he purchased a tent that could seat over 22,000 (the tent was the one used by evangelist Jack Coe up until his death in 1956). Allen became one of the first evangelists to call poverty a spirit and believed in God's ability to perform miracles financially. At the height of his ministry, Allen had over 350,000 subscribers to his ministry’s magazine-Miracle Magazine. The magazine retold stories sent in by admirers claiming Allen cured the sick, but gave a disclaimer that the magazine does not "assume legal responsibility" of its accuracy.
Few of his supposed miracles ever underwent "scrutiny of physicians" and at his revivals in small print his disclaimer read"A. A. Allen Revivals, Inc. assumes no legal responsibility for the veracity of any such report."
At a revival meeting on January 1, 1958, at Phoenix, Arizona Urbane Leiendecker, a recent convert, approached Allen and offered him 1280 acres (5.2 km²) of the finest land in Arizona.." Within days a deed was recorded in the name of A.A.Allen Revivals, Inc. at the Cochise County Courthouse. Using this property, Allen founded a Bible School in Miracle Valley.
His teachings on prosperity were a major theme in his meetings during the 1960s. He began selling "prosperity cloths" for $100 and $1000 dollar donations. Furthermore, he claimed to have "visions, divine voices, and prophecies."
He also "claimed to communicate with the demon world.
In 1979 Miracle Valley came to a close after bankruptcy hearings. Rioting on the property from some immigrants Chicago and part of Mississippi took place in this era and culminated in the death of Therial Davis, a six year old.
Legal problems occurred when in 1982, A. A. Allen's main administration building and his vast warehouse were set fire by an arsonist(s), which resulted in the total destruction of the facilities. The insurance company paid 1.5 million dollars for the reconstruction of the large building, or one million dollars for a 'cash-out.' Don Stewart wanted to take the cash-out; however, the Spanish Assemblies of God (Central Latin American District Council of the Assemblies of God) wanted the facilities to be rebuilt.
It was agreed upon by all that the Don Stewart Evangelistic Association (later known as Don Stewart Ministries, Inc.) would accept the insurance money of one million dollars for Miracle Valley, and the Assemblies of God would receive the Miracle Valley campus consisting of 15 buildings and nearly eighty acres of land for six dollars which equated into the one dollar per year for the previous six years. However, Don Stewart forced the Assemblies of God to maintain a Bible College for a minimum of twenty years, or the property would revert back to his ministry. In 1995, exactly twenty years later, the Assemblies of God closed Southern Arizona Bible College and put the campus up for sale. It appeared they incurred the same problem that faced Don Stewart from 1970-1975, there were no takers on the property.
In 1998, a group of ten people from the Melvin Harter Ministries, Inc. came from Ohio to view the campus. The next year, Miracle Valley Bible College was purchased by Melvin Harter Ministries, in August 1999 and the school continues under the administration of Melvin Harter as the Miracle Valley Bible College & Seminary where students are taught in classical Pentecostal theology.