This from Wiki:
The MIG-19 lacked mounts for air-to-air missiles but it had the one advantage over the early model Phantoms: it was armed with a cannon. Confirmed aerial victories by MiG-19s while assigned to the 925th FR, which match US records occurred on: 10 May 1972 in which two F-4 Phantoms were shot down by MiG-19s flown by Pham Hung Son and Nguyen Manh Tung. Both NVAF victories over the F-4s were accomplished by cannon fire.[5]['6][7] Combat results of the 925th FR using MiG-19s, according to the North Vietnamese Air Force were: two F-4s on 8 May 1972; two F-4s on 10 May 1972; one F-4 on 18 May 1972; and two F-4s shot down on 23 May 1972;[4] these losses were in exchange for 10 MiG-19s lost in aerial combat with US jets. The MiG-19 did make history in one manner however; on 2 June 1972 over the skies of North Vietnam, the MiG-19 has the inauspicious honor of being the first recorded jet fighter[citation needed] to be shot down in aerial combat by cannon fire at supersonic speeds, by a USAF F-4 Phantom flown by Phil Handley.
5. Michel, Marshall L. Clashes: Air Combat Over North Vietnam 1965-1972. Annapolis, MD: Naval Institute Press, 1997. ISBN 1-55750-585-3.
6. Sherwood, John D. Fast Movers: Jet Pilots and the Vietnam Experience. New York: Free Press, 1999. ISBN 0-312-97962-2.
7. Ethell, Jeffrey and Alfred Price. One Day in a Very Long War: May 10, 1972, Air Combat, North Vietnam. New York: Random House, 1989. ISBN 978-0-517-07934-8.
If you've read any of these, I'd be grateful for a review. Think I'll search the library for the first one.