Two-channel voice recorder, a copy of the legendary
Swiss dictaphone Nagra SNST. It was made in 1993 at the
Kiev special machinery factory, or the Research
Institute Manuilsky, now the SRI "MARS". Copied it was very scrupulous, but only its
mechanical part. Electronics is absolutely original,
Soviet, assembled on special microassemblies. Probable
beginning of production in 1988. The dictophone itself
is externally different from the Swiss original only by
the lack of a pointer voltage indicator / signal level. Instead, put
the LED, which in general, it is logical, though less
functional, it is impossible to estimate the degree of
discharge of batteries.
The LED flashes when the supply voltage drops to 2.1 v.
The minimum permissible supply voltage is
will explain that in fact the circuit is powered by a
voltage of 5 v, which is obtained from a pulsed
converter assembled on a microemplifier 41EM2, this
explains the low allowable voltage of the device.
In the kit, as with Nagra SNST,
there is a playback unit with separate adjustments for
each channel, a filter, an expander, a built-in speaker,
and a signal level indicator. This block is also
externally and functionally similar to the Swiss one,
but there are many constructive differences. Also
included are microphones with wire and without wires,
inductive sensors for recording telephone conversations,
AC adapter, battery pack for 2 D type batteries with
remote start button, separate remote power button, audio
cable, headphone interface directly to the recorder, and
coils with tape and without tape.
In addition, I was fortunate to receive, together with
the recorder, all the technical documentation with
diagrams, assembly drawings. On the cover of the book
with the documentation is written Явiр-1.
Since my recorder was made in 1993, it is clear that the
new name appeared after 1991, when Ukraine became
independent, and a wave of replacing Russian names with
Ukrainian ones began. It should be noted that almost all
the documentation is dated by dates no later than 1991.
The recorder works fine, but unfortunately I do not
have the opportunity to perform comparative tests with
the prototype Nagra SNST. Those who compared argue that
the domestic version works worse than the original.
Nevertheless, the quality of voice recording is good,
but the sensitivity is not enough. I did not try to
record music, but it is not intended for this, since the
claimed frequency band of 170 - 6000 Hz for music is
clearly not enough. Nagra SNST was intended for reporter
and espionage purposes, and Яхта-1М
was only for spying, there was no talk of music,
although in fact it was a stereo tape recorder. I will
add that the mechanics of the recorder works very
quietly, ideally for use as a special equipment.
I will add that Yavir is the Ukrainian name of one of
the species of the maple tree.
Specifications of the
Dimensions of the recorder with protruding details - 156 x 103
x 27 mm
Dimensions of the recorder without projecting details - 148 x 101 x 27 mm
Weight of the recorder - 600 g. Without batteries and coils
The speed of the belt is stable - 2.38 cm / s
Belt width - 3.81 mm
Time of continuous recording with tape thickness -
9 microns - 3 hours 08 minutes
12.5 microns - 2 hours 32 minutes
18 microns - 1 hour 44 minutes
Power - 2-3 v, two AA batteries, according to the passport elements A-316 "Прима",
or the battery in
The current consumption of the recorder - at a power supply of a dictaphone of
2,5 v no more than 120 ma
Frequency band - 170 - 6000 Hz
The detonation coefficient is not more than 0.35%
The harmonic distortion factor is not
more than 3%
Scans of the main electrical circuits can be found at
the bottom of the page. If the specification interests,
write to me on mail.
All images are enlarged to normal size.
Compare - on the left "Yacht-1M", on the
right "Nagra SNST".
This photo was sent to me by a collector
of rare technology from Hungary, known in the
appropriate forums under the pseudonym "Quad".
Photos can be enlarged
In the recording and
playback modes, buttons 1 and 2 check the presence of
the signal in channels 1 and 2, respectively. If there
is a signal, the red
LED lights up. Using the "КН" button, the voltage of the
power supply is checked, the "КНЗ" LED lights up. When
the supply voltage is below 2.1 v, the
In order to remove the bottom cover, it
is necessary to loosen three large-diameter screws on
the side walls of the recorder
Rewinding in this recorder is mechanical,
as it is made clear from photographs
To unlock the rewind knob, press the button on the side.
At that, the handle
rises above the level of the coils with a tape
On the inside of the top cover, beneath the curly
spring, there is a tool for adjusting the heads.
With it, you can rotate the
adjusting gears located under the heads
The control button has three positions.
From left to right - REWIND - STOP - PLAY / RECORD
large electronics board is an amplifier, a small one is
an engine control.
Everything is assembled on microassemblies
A pairing device for connecting
headphones directly to a voice recorder without a
Inductive sensors for recording telephone
At the bottom left is an audio cable and
a battery pack with a remote power button
Microphones are wired and without wires,
as well as a remote control button (with a purple wire).
Microphones use electret microphones of the type M1-B2 "Сосна"
In the bottom left, connect the recorder
to the playback unit.
On the right is the
connection of a microphone without a wire, a microphone
with a wire, and a power supply connector
These photos I did right after unpacking.
Some accessories were in
sealed original packaging
Playback block. Above
the expander board, below the amplifier
The playback unit has been sealed.
Before opening, I certainly photographed
The AC adapter was also sealed, with the
same seal as the playback unit, with the number 30
(provided by colleague
collector Alexander Yurinov)
operation of the device
operation of the component parts of the
Instructions, General Instructions
work and procedure of work
malfunctions and methods of their
storage rules, transportation