I cant find a good repair shop and "I am thinking of trying to fix" my 2 amps that are starting to crackle and pop even with no load on them.
I am ok/good at repairing simple electronics, real good at soldering, measuring with instructional Guidant's.
POA-2400 2ch
POA-6600a monoblock
On the 6600a I first was thinking it was CAPs going. So I did a lookup for replacements and couldn't find exact replacements for the big 10,000uf ones but I found some close / hopefully better replacements, So I think..
Here is the Info for others-hope it helps..
Original was Nippon chemi-con: 90volt 10,000uf 85deg temp, tolerance? Rated ripple (Arms) ? 50.8x82.55mm or 2inchx3.25inch.
New Cap Nichicon Grade TYPE-2: 100volt 10,000uf 85deg temp, Tolerance: 20% Rated ripple (Arms) = 6.90 50 × 100mm or 1.95x3.9inch Part # LKG2A103MKZ
But then I wondered could it be the IC or other chips but upon looking them up I cant find those exact ones or equal replacements.
Toshiba TLB521-1-BL / Optically Coupled Isolators, I can find TLB521-GB and other variances but the BL seems to have special ELECTRICAL CHARACTERISTICS 200min%-600max% and I cant find it anywhere.
Mitsubishi M5238P / DUAL LOW NOISE JFET INPUT OPERATIONAL AMPLIFIERS 8 PIN DIP, I can find it but not sure if they are legit suppliers.
Mitsubishi M5238P or NJM-082DT/BD JRC or NJM-2068DA JRC, I haven't tried to lookup yet
Hitachi HD14001BP / Quadruple 2 Input NOR GATE, I haven't tried to lookup yet..
Thanks!
I am ok/good at repairing simple electronics, real good at soldering, measuring with instructional Guidant's.
POA-2400 2ch
POA-6600a monoblock
On the 6600a I first was thinking it was CAPs going. So I did a lookup for replacements and couldn't find exact replacements for the big 10,000uf ones but I found some close / hopefully better replacements, So I think..
Here is the Info for others-hope it helps..
Original was Nippon chemi-con: 90volt 10,000uf 85deg temp, tolerance? Rated ripple (Arms) ? 50.8x82.55mm or 2inchx3.25inch.
New Cap Nichicon Grade TYPE-2: 100volt 10,000uf 85deg temp, Tolerance: 20% Rated ripple (Arms) = 6.90 50 × 100mm or 1.95x3.9inch Part # LKG2A103MKZ
But then I wondered could it be the IC or other chips but upon looking them up I cant find those exact ones or equal replacements.
Toshiba TLB521-1-BL / Optically Coupled Isolators, I can find TLB521-GB and other variances but the BL seems to have special ELECTRICAL CHARACTERISTICS 200min%-600max% and I cant find it anywhere.
Mitsubishi M5238P / DUAL LOW NOISE JFET INPUT OPERATIONAL AMPLIFIERS 8 PIN DIP, I can find it but not sure if they are legit suppliers.
Mitsubishi M5238P or NJM-082DT/BD JRC or NJM-2068DA JRC, I haven't tried to lookup yet
Hitachi HD14001BP / Quadruple 2 Input NOR GATE, I haven't tried to lookup yet..
- If you think I really need a scope to do this and if you know of a inexpensive one, please suggest. just for amp repair.
- Any idea's a good source to find chips with exact same spec. without hrs/days of searching? no eBay or Alibaba ect..
- Any idea's how to find exact problem. I have multimeters but don't have an oscilloscope.
Thanks!
Mostly these amps suffer from bad solder joints.
Discharge the caps/psu, then remove the pcb and resolder everything.
99% chance that fixes everything.
Discharge the caps/psu, then remove the pcb and resolder everything.
99% chance that fixes everything.
