Sony TA-F555ES Amplifier 100W

Sony TA F555ES Amplifier
ACT :  Audio Current Transfer
Shunt Regulated Power Supply for Signal Section
Big BJT Discrete  Phono, EQ, Board including MC and MM Load Selector
Elna for Audio Capacitors
Sanken Power BJT: 2SC2922 2SA1216

Sony TA-F555ES front view

Regulated Shunt Power Supply Regulator

Audio Current Transfer...

Sony Power

Attenuator

EQ Board,  Discrete BJT Phono stage including MC cartridge amplifier

Cartridge Load Selector

Sony TA-F555ES inside View

Sony TA F80 ; Power Amplifier 120 + 120W, PLPS Power Supply, Restoration Project pt.II

 Amplifier Sony TA-F80 :

Sony TA-F80 

Sony's Knobs after clean

 TA-F80 power board with Heat Pipe and power BJT,  NEC 2SC2681 instead Sony 2SC2571 from factory..

Sony Power Board Before Restoration

Input and EQ Control Boards

Sony Japan RIAA - UNIT 

 Pulse Loked Power Supply PLPS:

TA-F80 Amplifier  Inside

Sony TA F80 ; Power Amplifier 120 + 120W, PLPS Power Supply, Restoration Project

Sony TA-F80 Power Amplifier

• Low Noise Head Amp, Sony's BJT 2SC2014
• 120 +120W continuos (8ohm) 
• Pulse Loked Power Supply 
• Heat Pipe

Low Noise Head Amp MC

2SC2014 is a Low Noise BJT developed for MC Stage Amplifier 

Phono RIAA Amplifer Q201 2SK97

BJT Power Amplifier , Fet Input Diff. Amp.

PLPS Power Supply Pulse Power

Philips Amplifier RH 521 Revisited Class AB 50W Project

Power section of Philips RH 521 70's Calss AB Amplifier modified in:

Full Complementary Output Power Stage, Thoshiba 2SC3281 2SA1302 or Sanken 2SC3519 2SA1386

Cascode for VAS Stage

Feedback amount changed

Philips RH 521 Amplifier 

Distortion at 20Vpp

Project About Aloia's TriodoSolido Style Hybrid Amplifier 100W

Clone of Aloia's Amplifier called Triodosolido.
Semplified versione whitout Protection and Limiters circuits

Tubes are 2 x 6SN7 double triode.
Output BJT 2SC3281 2SA1302
Tube VAS Supply300Vdc
Catode Follower Rail Supply: 50Vdc, -50Vdc
No Negative Feedback (0 Negative Feedback)