Audio Database

The

ROTEL RT-325
27,900yen(around the 1970 in-the-early time)

Description
 
The FM/AM tuner which improved the high sensitivity and the stability by the design by a skillful circuitry technology.

By using of the front end which combined the precision Triple unit variable condenser and low noise FET, a high sensitivity and the stonewalling exclusion capacity to have excelled are acquired.
Moreover, IF circuitry of a four-step amplification is adopted.

FM monophonic stereo automatic switching circuitry is carried. If an FM broadcast becomes a stereo from a monophonic recording, the electronic switch will operate automatically and a stereo reception can be performed.

The tuning meter is carried.

The muting switch which stops the inter-office noise at the time of FM broadcast tuning is carried.


Rating of a mode
Form FM/AM tuner
<FM tuner part>
Received frequency 76MHz - 90MHz
Antenna impedance 300-ohm equilibrium
75-ohm unbalance
Sensitivity (IHF) 2.2 microvolts
THD
(400Hz, 100% modulation)
mono:0.5%
stereo:1%
S/N ratio 65dB
Image stonewalling ratio 60dB
Spurious response 80dB
Intermediate-frequency-jamming ratio 80dB
Capture ratio 3dB
Selectivity 45dB
Separation 35dB(1kHz)
SCA supression ratio 60dB
Subcarrier suppression 40dB
Stereo mono-auto level 50dB
Audio output 1.5V
Demphasis 50 microseconds
<AM tuner part>
Received frequency 535kHz - 1,605kHz
Practical speed 25 microvolts (S/N=20dB)
Image ratio 50dB(1MHz)
Intermediate-frequency-jamming ratio 50dB(1MHz)
S/N ratio 50dB
<Synthesis>
The semiconductor used Transistor: 19 pieces
FET: One piece
Diode: Ten pieces
Supply voltage AC100V/120V/200V/240V, 50Hz/60Hz
Power consumption 12VA
Dimensions Width 358x height 120x depth of 235mm
Weight 3.9kg