Dokorder PT-4H
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Dokorder
PT-4H.
Portable reel tape recorder. Made in Japan, presumably
in 1964. Dimensions 195 x 100 x 55 mm with no protruding
parts. Weight without battery 1.2 kg. Power 7,5 v, five
AA batteries. In the recorder used coil diameter 3, 1/4
inch tape width 1/4 inch. Construction machinery is
rather complex, the whole mechanics and body metal. In
the kinematics uses two belts, also made of metal, a
coiled spring. Belt speed is stabilized.
Horizontally-mounted engine rotates rubberized flywheel
axis of which is capstan. Both heads have a cylindrical
shape, and the total clamping strip. Thrust has two
fixed positions, which is very handy when filling up the
tape. The coils are fixed on the reel table with latches
that do not allow them to fly off at any position of the
recorder. It can be put or put whatever you like. For
the convenience of a folding metal stand is in the form
of staples. Near the pinch roller is the pin on which
the attachment is stored on the capstan, increasing its
diameter. The nozzle is fixed to the capstans screw.
Increasing the diameter capstans increases the speed of
the tape. At the lowest speed (1, 7/8" per second) device can be
used as a dictaphone. At high speed (3, 3/4" per second) recording quality is
much better and can play music. In general, the tape
makes a good impression. Unfortunately there is no fast
forward at all, and rewind hand, is carried by the
handle located on the side of the body. To rewind the
need to nominate the handle from the body, and rotate
clockwise. To switch modes, there are three key "STOP",
"REC", and "PLAY", located in a row. In addition there
are volume controls, and connectors for a microphone,
headphones and external power supply. On the front side
of the shell is a metal curtain covering the threaded
hole into which is screwed the cable remote activation.
Such cable previously used with cameras for remote
activation. Batteries are inserted into a metal tape
having a connector. When the cassette is inserted into
the battery compartment, plug is combined with the
connector in the body. Circuit collected six transistors
2SB73 (1 pc.), 2SB75 (2 pcs.), 2SB77 (2 pcs.), D65 (1 pc.).
The
device was bought in working condition, but
after replacing the dried electrolyte generally was as
new. Included with the tape recorder
were leather case and original microphone DM-0051.
Photos
can be enlarged
Erase head (left in photo) is made in the
form of a cylinder with integrated rectangular magnet.
When the recording mode is turned head rotates about its
axis and is supplied to the magnetic tape. In the
picture below left enabled playback on the right - the
recording mode, see the rectangular magnet
In the picture below the shutter covering
the hole for the cable remote control
In the photo below left steering gear
erase head
Operating instructions Dokorder PT-4H
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