|900,000 yen(one set, a release time -unknown)
Tube monophonic power amplifier which supplied the newest electro technology and
SA-4 is the OTL (output transformer-less) power amplifier
which does not carry the output transformer used with common tube power
There are a SEPP type of one power source, a SRPP type, a SEPP
type that supplies positive/negative 2 power source, and also an OCL (output
capacitor Les) type of OTL amplifier which omits an output capacitor, supplies
positive/negative 2 power source, and maintains the middle point at zero
potential. In SA-4, the OCL composition which carried out direct coupling of an
output pipe and the speaker is adopted, and not only an output transformer but
an output condenser is not carried.
This has eliminated bad influences, such
as a wire wound resistor by an output transformer, and stray capacitance of a
disclosure inductance and a wire wound.
In order to prevent
direct-current ingredient flowing into a speaker instead of an output condenser,
the servo amplifier system original with SA-4 is carried. When direct current
flows exceeding the allowable level which are 30mV - 90mV which IC memorized,
this servo amplifier operates, and this says that SA-4 and a speaker are
intercepted in an instant, and has prevented breakage of a speaker beforehand.
The auxiliary system which carried out coupling of the capacitor which
cuts 16Hz or less is also carried.
The output stage consists of eight
The powerful power source which can ensure a stable supply of 1kW
is carried in the power-source part.
The ammeter for bias adjustment and
a meter selector, and half-fixed trimmer potention meter are carried in the
front panel, and the check of the current bias of each output pipe or idle
current can be performed.
There was also a black model besides a silver
||Tube monophonic power amplifier
||0.1Hz - 50kHz
||0.1% or less (at the time of the maximum
0.02% (at the time of 20W output)
|Power supply voltage
||200W (at the time [ Usually ] of use)
||Width 480x height 170x depth of 480mm