Pioneer TX-9900 high-class FM stereo tuner

Description

Pioneer TX-9900
Reference Grade Stereo Tuner
The 7-unit variable condenser only for FM is adopted as a front end part.
This 7-unit variable condenser is combined with the three dual gates MOS FET, and is raising selectivity by the three-step stream composition of the single tune, the double tune, and the triple tune. The original usage which the double tune called L join and the triple tune said to it and a concurrent as C join is taken in, and the gain deflection covering all the receiving bands is also suppressed within 0.5dB.
Moreover, the sensitivity is raised to FET currently used by using that by which SN sorting was carried out specially.
Form
FM stereo tuner

Circuit system
Two steps of MOS FET RF, a 7-unit variable condenser, automatic-phase-color-system phase locked tuning
IF A seven-step limiter with a BAND switching, a super-wide band wave detector, PLL MPX
Practical speed
mono: 5microvolts (S/N 50dB)/2 microvolts (IHF)
stereo: 50 microvolts (S/N 50dB)
S/N
wide: 80dB (mono), 75dB (stereo)
narrow: 75dB (mono), 70dB (stereo)
THD
wide
mono:
0.08%(100Hz)
0.08%(1kHz)
0.08%(10kHz)
stereo:
0.1%(100Hz)
0.1%(1kHz)
0.3%(10kHz)
narrow
mono:
0.2%(100Hz)
0.2%(1kHz)
0.2%(10kHz)
stereo:
0.3%(100Hz)
0.3%(1kHz)
0.6%(10kHz)
Capture ratio
wide:0.8dB
narrow:2.0dB
Effective selectivity
wide: 35dB (400kHz), 20dB (300kHz)
narrow: 65dB (300kHz), 12dB (200kHz)
Separation
wide: 50dB or more (1kHz), 40dB or more (50Hz - 10kHz)
narrow: 40dB or more (1kHz), 35dB or more (50Hz - 10kHz)
Carrier leakage supression ratio
wide:75dB
narrow:70dB
Frequency characteristic
50Hz-10kHz+0.2 -0.5 dB
20Hz-15kHz+0.2 -1.0 dB
Image stonewalling ratio
120dB or more
IF stonewalling ratio
120dB or more
Spurious stonewalling ratio
120dB or more
Muting operation level
5 microvolts/28 microvolts
Antenna
A 300-ohm balance type, a 75-ohm unbalance type

An Output voltage/impedance
Fixed: 650mV / 5kohm
Variable: 70mV - 2V/3.5kohm
4ch MPX: 400mV / 2.5kohm
The semiconductor used
Transistor: 49 pieces
FET: Nine pieces
IC: 15 pieces
Diode,others: 41 pieces
AC outlet
Power-switch un-interlocking.: One line
Supply voltage
AC100V, 50Hz/60Hz
Power consumption
22W (rate)
Dimensions
Width 420x height 165x depth of 385mm
Weight
11.3kg
*Japan Local Version Frequency 77~ 91MHz
Very Good Condition
All function perfect working
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