I've been eyeing this beauty since I bought it. Cosmetically it is about an 8/10. It appears to be totally unmolested. Electronically it all seems to work excepting the channel drop out once in a while. I did a quick and dirty deoxit session with it that helped. I plan on keeping this amp in my small collection. So, the restoration begins. I've already pulled the faceplate and have all the control board (X11-1410-00) apart. The plan after reading all I can find on restoring the KA-9100 is listed below.
1) Light bulb or bulbs in meter burned out. Will contact dgwojo for them.
2) Changing all electrolytics capacitors. Will use Nichicon PW and PM everywhere, except the Control board. All the orange capacitors will be replaced with Elna Silmi II and the Nichicons in otherplaces. I'm also using Wima films for the 1 uF 50V caps.
3) The 4 big filter caps will be replaced with Nichicon Gold Tune solder lug 10000 uF 63V from Michael Percy.
The Boards:
Power Supply (X00-1870-11)
1. Recap electrolytics. I am increasing the voltage to the next available higher voltage.
2. replace DZK1 YZ-140 zener with TZX14B-TAP
3. replace DK1-5 W06B diodes with 1N4005
4. Replace relay with Omron MY4-02 DC 24
Diode Board (X00-1880-11)
1. Replace 4 big filter caps with Nichicon Gold Tune
2. Replace small electrolytics with Nichicon PM or PW
3. Replace DZ9 W06B with 1N4005
4. Replace DZ10-12 1S2076 with 1N4148
5. Question? Should the transistors be changed on this board. If so,
a. QZ1,3 2SC945 replace with KSC1845
b. QZ2 2SC1212A replace with KSC2690A
Power AMP (X07-1500-11)
1. Replace all carbon resistors with carbon film 1/2W. Not replacing Metal Film.
2. Recap small electrolytics with Nichicon PM or PW
3. Transistors
a. Q1-4 2SC1775 looking for suitable replacement
b. Q5-8 2SA912 T0-92 replace with MJE350 T0-126
c. Q9,10 2SC1400 looking for suitable replacement
d. Q11,12 2SC1885 T0-92 replace with MJE340 T0-126
e. DE1,2 EQA01-24 zener replace with 1N5252B
4. replace trimmers with Bourns 3229Y 500 ohm 1/2W
5. Refresh thermal compound on TA-100W IC
6. Replace De3-6 1S2076 with 1N4148
This is all I can think of to do to this amp. You guys see any problems with the plan or is there something I should do that I haven't listed. Any problems with my substitutions. Any feedback will be greatly appreciated. I am no electronics tech but have done some light work. I have restored a Sansui G9000DB, Restored a Marantz 1060 amp, repaired Marantz 2230, 2220 receivers. Also repaired a Kenwood KR-5400. I can say this KA-9100 is a bitch to take apart and I'm sure desoldering and soldering parts is going to be a lot of fun may be
1) Light bulb or bulbs in meter burned out. Will contact dgwojo for them.
2) Changing all electrolytics capacitors. Will use Nichicon PW and PM everywhere, except the Control board. All the orange capacitors will be replaced with Elna Silmi II and the Nichicons in otherplaces. I'm also using Wima films for the 1 uF 50V caps.
3) The 4 big filter caps will be replaced with Nichicon Gold Tune solder lug 10000 uF 63V from Michael Percy.
The Boards:
Power Supply (X00-1870-11)
1. Recap electrolytics. I am increasing the voltage to the next available higher voltage.
2. replace DZK1 YZ-140 zener with TZX14B-TAP
3. replace DK1-5 W06B diodes with 1N4005
4. Replace relay with Omron MY4-02 DC 24
Diode Board (X00-1880-11)
1. Replace 4 big filter caps with Nichicon Gold Tune
2. Replace small electrolytics with Nichicon PM or PW
3. Replace DZ9 W06B with 1N4005
4. Replace DZ10-12 1S2076 with 1N4148
5. Question? Should the transistors be changed on this board. If so,
a. QZ1,3 2SC945 replace with KSC1845
b. QZ2 2SC1212A replace with KSC2690A
Power AMP (X07-1500-11)
1. Replace all carbon resistors with carbon film 1/2W. Not replacing Metal Film.
2. Recap small electrolytics with Nichicon PM or PW
3. Transistors
a. Q1-4 2SC1775 looking for suitable replacement
b. Q5-8 2SA912 T0-92 replace with MJE350 T0-126
c. Q9,10 2SC1400 looking for suitable replacement
d. Q11,12 2SC1885 T0-92 replace with MJE340 T0-126
e. DE1,2 EQA01-24 zener replace with 1N5252B
4. replace trimmers with Bourns 3229Y 500 ohm 1/2W
5. Refresh thermal compound on TA-100W IC
6. Replace De3-6 1S2076 with 1N4148
This is all I can think of to do to this amp. You guys see any problems with the plan or is there something I should do that I haven't listed. Any problems with my substitutions. Any feedback will be greatly appreciated. I am no electronics tech but have done some light work. I have restored a Sansui G9000DB, Restored a Marantz 1060 amp, repaired Marantz 2230, 2220 receivers. Also repaired a Kenwood KR-5400. I can say this KA-9100 is a bitch to take apart and I'm sure desoldering and soldering parts is going to be a lot of fun may be