i doubt that the to-66 ouput transistors are still available, but no to worry, there are lots of to-220 replacements out there if the need arises....
i cloned the phono preamp/tone control sections as well.....sold lots of them... is that a working unit btw?
yup fully functioning! only the tuning dial is misaligned yet functioning well. its driving my ribbon planars and subwoofer now.
tnx for the info on parts.
gawin mo uli! (sama ako ng isang unit!
accdg to net info >
http://www.thevintageknob.org/PIONEER/SX770/SX770.htmlfrom an ebay seller>
Pioneer SX-770
TRANSISTORS & DIODES
Tuner Section
ICs: 3
FET: 1
Transistors: 12
Diodes: 9
Audio Section:
Transistors: 21
Diodes and etc. 7
FM SECTION
Circuitry:
Front-end using "FET"
Frequency Range: 87.5-108 MHz
IHF Usable Sensitivity: 1.8 uV
Image Rejection: 60 dB (at 98 MHz)
Signal to Noise Ratio: 70 dB (IHF rating)
Antenna Input: 300 ohms (balanced)
MULTIPLEX SECTION
Circuitry:
Time switching type de-modulator
FM Mono/Stereo automatic selection
Channel Separation: 40 dB (at 1 kHz)
AM SECTION
Circuitry: Superheterodyne
Frequency Range: 525-1605 kHz
IHF Usable Sensitivity: 10 uV
Image Rejection: 55 dB (at 1000 kHz)
Antenna Input: Built-in Ferrite loopstick antenna
AUDIO SECTION
Circuitry: Single-ended push-pull
Music Power Output (IHF Rating):
70 watts at 4 ohms
52 watts at 8 ohms
RMS Rated Power Output (both channel driven):
17 + 17 watts 4 ohms
15 + 15 watts 8 ohms
RMS Rated Power Output (each channel driven): 20/20 watts 8 ohms
Frequency Response: +/-3 dB from 20 Hz to 40 kHz (Over-all)
Harmonic Distortion: Less than 0.8% (at 1 kHz rated output)
Power Bandwidth: 15 Hz to 35 kHz (AUX)
Hum & Noise (at rated output):
MAG better than 80 dB
AUX better than 95 dB
Inputs Impendance and Audio Sensitivity (for rated output):
MAGnetic PHONO 2.5 mV 50 kOhms (1 kHz)
CERamic PHONO 58 mV 100 kOhms (1 kHz)
MICrophone mV 100 kOhms (1 kHz)
TAPE MONITOR <200 mV 100 kOhms (1 kHz)
AUXiliary 200 mV 100 kOhms (1 kHz)
Damping Factor: 35 (8 ohms, 1 kHz)
Output Terminals and Jacks:
Speakers 4 to 16 ohms
Stereo headphones jack
Simultaneous tape recording jacks, equipped with TAPE MONITOR switch
Tape recording/playback jack (DIN type)
Equalization Curves:
PHONO: RIAA
Tone Controls (each channel):
BASS boost 13 dB, cut 9 dB (at 50 Hz)
TREBLE boost 10 dB, cut 9 dB (at 10 kHz)
Filters:
HIGH - cut 9 db (at 10 kHz)
Loudness Contour: Switchable ON-OFF, boost 12 dB at 50 Hz, boost 7.5 dB at 10 kHz, with VOLUME control set at 40 dB