Audio Database

TC-505
Commentary

Stereo preamplifier equipped with AM/FM tuner.

The FM front end of the tuner section employs a 3-row varicon and an FET in the RF stage to obtain high sensitivity and to improve the ability to eliminate interfering waves such as cross modulation and image rejection.
In addition, the AGC circuit improves the selectivity in a strong electric field.

The 4-stage IF amplifier and 3-stage limiter circuit provide sufficient limiter limiter effect make reception easy even in noise prone areas.

Muting and Noise Canceler switches are 3-stage switching systems, so you can enjoy noise-free broadcasting both when selecting channels and when receiving signals.
Muting eliminates inter-station noise and allows quiet channel selection.
The noise canceller eliminates the conventional high-cut method and eliminates noise when receiving FM broadcasts without cutting the high-frequency audible range.

The power supply for the FM front-end, FM and AM sections uses a stabilized Zener diode power supply.
In particular, we have succeeded in eliminating the AFC circuit by safely compensating the temperature of the station generator with the front end and minimizing the station generator drift by stabilizing the power supply.

Equipped with a sharp pinpoint tuning circuit.

Equipped with 35 db separation FM multi-circuit.

Equipped with pure electronic FM stereo and mono switching.

The FM antenna is equipped with two circuit impedance terminals of 300 Ω and 75 Ω, and is equipped with a local / variable switch so that undistorted reception is possible even in high-field areas.

The AM tuner section contains a high-sensitivity ferrite bar antenna.

The preamplifier section consists of an NF amplifier for all amplifier circuits from the first stage to the final output stage.
A specially selected low-noise silicon transistor is used in the equalizer circuit, and an all-silicon transistor is used in the low-frequency section to reduce the S/N ratio.

The tone control amplifier section is designed with attention to noise and distortion characteristics by using low-noise silicon transistors and NF-type tone control.

It is equipped with a headphone jack separate booster independent of the output circuit, it can also be used effectively as a monitor.

Accessories such as high filter, low filter and loudness control are mounted.

Model Rating
Preamplifier with FM/AM tuner
Tuner Section
FM : Receive Frequency 76 MHz to 90 MHz
Sensitivity 2.0 μ V ± 3 dB (S/N : 20 dB quieting)
Image ratio 50 dB or more
Selectivity 45 dB or more
S/N 60 dB or more
Harmonic distortion factor Not more than 0.8%
Spurious response rejection 60 dB or more
Spurious Radiation 34 dB or more
Capture ratio 3.0dB(IHF)
FM stereo separation 35dB
IF Rejection 60 dB or more
Local/Distant Switch Local:attenuate 20dB
Distant:Direct
AM : Receive Frequency 535 kHz to 1605 kHz
Sensitivity (IHF) 20 μ V ± 3 dB (1000 kHz)
Selectivity 20 dB or More (1000 kHz)
Image Rejection 40 dB or More (1000 kHz)
IF Rejection 60 dB or More (1000 kHz)
Preamplifier Section
Output (Emitter Follower) Rating : 1.5 v
Maximum : 3 v
Harmonic distortion factor 0.3% or less
Input Sensitivity / Impedance
(Rated Output)
Phono : 2.5 mV ± 3dB/50k Ω
AUX : 150 mv ± 3dB/100k Ω
Tape Monitor (Pin) : 200 mv ± 3dB/100k Ω
Tape Monitor (Din) : 200 mv ± 3dB/100k Ω
Recording Output (Rated Output) Pin : 150 mv ± 3 db
Din : 30 mV ± 3 dB
Hum, noise (rated output) Volume Min : 80 dB or higher
Phono : 65 dB or more
AUX : 75 dB or more
Channel separation
(Rated Output)
Phono : 50 dB or more
AUX : 50 dB or more
Equalizer Phono : RIAA, NF Type
Control, switch Bass : ± 12 dB (50 Hz)
Treble : ± 10 dB (10 kHz)
Loudness : 50 Hz + 8 dB, 10 kHz + 2 dB (at volume -30dB)
Low filter : -12dB at 30 Hz
High filter : -12dB (15 kHz)
Selector switch (1)Phono
(2)FM AUTO
(3)AM
(4)AUX
Mode switch 1:mono(L+R)
2:Stereo
<General>
Configuration 28 tr, 20 di, 1 FET
Pwer 100 VAC, 50Hz/60Hz
Power consumption 10VA
External dimensions Width 382x Height 111x Depth 267 mm
Weight 6.3kg
Sold Separately Dedicated Wood Case C-9