Audio Database

The

ROTEL RT-622
49,000yen(around the 1973 time)

Description
 
The FM/AM tuner which supplied the newest circuitry technologies, such as IC.

Low noise FET and the triple variable condenser are adopted as FM front end part.

IC circuitry technology is adopted as IF stage and the MPX stage.

The ceramics filter is adopted.

The muting and the MPX filter are carried.

Two syntony indications meter is carried.

Two output-terminals are carried.


Rating of a mode
Form FM/AM tuner
<FM tuner part>
Antenna impedance 300-ohm equilibrium
75-ohm unbalance
Sensitivity (IHF) 1.7 microvolts
THD 0.5% or less
S/N ratio 70dB or more
Image stonewalling ratio 100dB
Spurious response 100dB
Intermediate-frequency-jamming ratio 100dB
Capture ratio 1.0dB
Selectivity 80dB
Separation 40dB(1kHz)
SCA supression ratio 60dB
AM supression ratio 50dB
<AM tuner part>
Sensitivity 20 microvolts (S/N=20dB)
Image stonewalling ratio 50dB(1MHz)
Intermediate-frequency-jamming ratio 70dB(1MHz)
S/N ratio 50dB
Selectivity 30dB
<Synthesis>
The semiconductor used Transistor: 25 pieces
FET: One piece
IC: Three pieces
Diode: 14 pieces
Ceramics filter: Five pieces
Power consumption 20VA
Dimensions Width 420x height 140x depth of 240mm
Weight 5kg