Onkyo Grand Integra M-508 power amplifier rebuilding

[Khalidkh]

Hello guys,

I am new to this forum and i personally found this forum very helpful and helpful people.

I am rebuilding recaping my onkyo grand integra m-508 power amplifier. I have already replaced main 8 filter power capacitors with 100 volts 10000uf cornell dublier capacitors. All other capacitors i bought are elna silmic ii nichicon fine gold nichicon muse and Panasonic fm.
I want to know that originally at c413-c416 there is nichicon muse 16v/10uf polarized caps and these muse caps are not available anymore only nichicon muse es bipolar are available in that value so i bought nichicon muse es bipolar caps instead of polarized capacitors. Can you people help me telling can i use bipolar nichicon muse es caps in that place instead of polarised?

My other question is can i replace c463-c466 polarized 3.3uf 50volts electrolytic caps with wima film caps?

Picture added of factory fitted nichicon muse polarized capacitor (green ones)

Help will be highly appreciated.
Thanks

 

[Khalidkh]

Anybody???

 

[patrick101]

c413-c416 caps are for the bias circuit and no need replaced by nichicon muse cap only, other caps like elna silmic ii nichicon fine gold nichicon muse and Panasonic fm are also good for it's application.

c463-c466 caps are for the output power transistors over current protection circuit, no need change to a high grade wima film caps.

 

[patrick101]

Nichicon MUSE audio caps :

Polarized caps - KZ series (black color)
Bipolar caps - ES series (green color)

 

[Khalidkh]

Thanks
But i want to know can i use bipolar caps in those place because i have those? I didn't bought polarized capacitors.

 

[patrick101]

yes, you can use bipolar cap, it just a kind of decouple cap for the diode D417 and D419 for about 1.8V voltage each

 

[Khalidkh]

Thanks alot for your help.

 

[Khalidkh]

Can you help me in one more thing and that what is L401 and L402 coils is for and how to adjust it?

 

[patrick101]

It is a kind of feedback transformer form the power output to the driver circuit. No adjustment should be needed.

 

[Khalidkh]

Thanks

 

[patrick101]

Thanks

 

[Phillou63]

Bonjour Khalidkh, la photo que vous montrer est un M504.

 

[Sangram]

This is an English language forum. Thank you for not using other languages.

Ceci est un forum en anglais. Merci de ne pas utiliser d'autres langues.

Hello Khalidkh, the photo you are showing is an M504.

 

[Phillou63]

Ok Sangram, sorry i didn't know that.
My greetings

 

[Sangram]

All good, no worries 🙂

 

[Khalidkh]

Yes pictures are of onkyo m504 but i have both m504 and m508 and recapped refurbished my both amps.

Will upload pictures of both amps in future...if the time permits

 

[bekim]

I am rebuilding recaping my onkyo grand integra m-508 power amplifier. I have already replaced main 8 filter power capacitors with 100 volts 10000uf cornell dublier capacitors.

Hi Khalidkh,
Welcome to diyAudio forum.

Could you kindly provide information on, which model of the capacitors you use for filter caps? I search website and I could find only screw type capacitors.

Appreciate your reply.

bekim

 

[Khalidkh]

Hi Khalidkh,
Welcome to diyAudio forum.

Could you kindly provide information on, which model of the capacitors you use for filter caps? I search website and I could find only screw type capacitors.

Appreciate your reply.

bekim

I dont remember the model number it was 3 years ago but it 100 volts 10000uf cornell dublier capacitors.

 

[Khalidkh]

I dont remember the model number it was 3 years ago but it 100 volts 10000uf cornell dublier capacitors.

 

[Khalidkh]

Link of the pictures of my Onkyo M 508 rebuild, recapped and refurbished power amplifier.


https://www.diyaudio.com/community/...hed-onkyo-m-508-power-amplifier.392026/latest