Akai videotape format

The 1/4 inch Akai is a portable helical scan EIA and CCIR analog recording video tape recorder (VTR) with two video record heads on the scanning drum. The units were available with an optional RF modulator to play back through a TV set, as well as a detachable video monitor. The Akai Electric Ltd. VTR plant was in Tokyo, Japan.
Early B&W models.
The Akai X500-VT from about 1968 pictured is perhaps the oddest of the Akai format machines in as much as it is both a stereo reel to reel audio recorder of 3.3/4 and 7.5 inch per sec tape speed having an auto reverse function, as well as a video recorder combined in the same machine. Two separate tape paths are used and according to the way the tape is threaded, either two channel stereo audio 4-track, or black and white video with monoaural sound could be recorded and played. Tape speed for video recording like the VT100 and VT110 is 11.1/4 Inch per sec.
For the time, this machine was very advanced using many innovations not used in other domestic video machines for many years, such as inverter drive video head motor to name but one. About 10 years later when Sony introduced the Beta format, the first couple of models the video head speed was controlled by a line synchronised AC motor and eddy-current brake.
The model shown here, X500VT, was sold only in Japan and the United States, ~(under the Rheem/Roberts re-badge agreement) and in very low quantities due to its high cost. the highest serial number known to author is 00050, indicating the probability of only a tiny production run.
Camera Specs:
Akai produced two types of portable black and white VTR using 1/4 inch tape: Portables using an open reel of 13 cm diameter (VT-100/-110/-120), and a single stationary model using a 27 cm open reel, designated VT-700.
Color model.
VTR Specs:
Camera Specs: