Audio Database

The

ROTEL RT-1220
59,000yen(around the 1973 time)

Description
 
The FM/AM tuner which adopted newly developed MOS FET and 5-unit variable condenser.

The ceramics filter is adopted as IF stage. Moreover, IC is adopted as IF stage and a MPX circuitry.

The demphasis and the muting sensitivity switchover are carried.

Two output circuits and a headphone jack are carried.


Rating of a mode
Form FM/AM tuner
<FM tuner part>
Antenna impedance 300-ohm equilibrium
75-ohm unbalance
Sensitivity (IHF) 1.5 microvolts
THD 0.5% or less
S/N ratio 70dB or more
Image stonewalling ratio 110dB
Spurious response 110dB
Intermediate-frequency-jamming ratio 110dB
Capture ratio 1.0dB
Selectivity 90dB
Separation 40dB(1kHz)
SCA supression ratio 60dB
AM supression ratio 52dB
<AM tuner part>
Sensitivity 15 microvolts (S/N=20dB)
Image stonewalling ratio 75dB(1MHz)
Intermediate-frequency-jamming ratio 75dB(1MHz)
S/N ratio 50dB
Selectivity 40dB
<Synthesis>
The semiconductor used Transistor: 31 pieces
FET: Three pieces
IC: Three pieces
Diode: 19 pieces
Ceramics filter: Four pieces
Power consumption 30VA
Dimensions Width 420x height 140x depth of 304mm
Weight 8kg