A rotary head drum device includes a rotary drum and a plurality of rotary
heads mounted on the rotary drum. The rotary heads record and reproduce a
signal on and from a magnetic tape. The rotary heads are as follows. First
and second rotary heads for an information signal in a low-frequency range
are opposed to each other diametrically with respect to the rotary drum,
and are different from each other in azimuth angle. A third rotary head is
designed for digital signals in frequency ranges higher than the frequency
range of the information signal, and for first and second operation modes
being different from each other in data transmission rate. A fourth rotary
head for a digital signal in the second operation mode is opposed to the
third rotary head diametrically with respect to the rotary drum, and is
equal in azimuth angle to the third rotary head. A fifth rotary head for a
digital signal in the first operation mode is substantially opposed to the
third rotary head diametrically with respect to the rotary drum, and is
different from the third rotary head in azimuth angle. The fourth and
fifth rotary heads are in a double azimuth head structure. Sixth and
seventh rotary heads for a digital signal in the second operation mode are
opposed to each other diametrically with respect to the rotary drum, and
are equal to each other in azimuth angle.