AnalogueBen
Well-Known Member
Hello to all
I've only recently acquired this amp and it was functioning fine up until I learned a valuable lesson on having my meter set to the right function (mA-ac VS mA-dc, big difference!) As a consequence I blew two outputs doing a bias setup.
I'm gathering up info and so far have got my transistor list about right I think, so I'll post it now and see whether it looks good to go.
Then I'd like to plan choosing caps, other components and any mods going from board to board, following the illustrations given in the service manual. Try to keep it simple and easy to use as a guide. Fyi, I'll be doing all the work myself, about to build a DBT, have a scope but never used it in anger, got a Fluke meter, transistor tester and can't understand schematics other than their symbols.
Output Transistors~
Original - NEC 2SD188 NPN
Replacement - OnSemi MJ21194G NPN
Original - NEC 2SA627 PNP
Replacement - OnSemi MJ21193G
Remaining transistors ~
Original - CDC8002
Replacement - ZTX694B
Original - CDC9002
Replacement - ZTX795A
Original - XA495
Replacement -ZTX795A
Original - 2SC871R (E,F), (F)
Replacement - KSC1845
Will also order KSA1015 & KSC1815 as these could be used here in some chosen places are also good to have anyway.
Because this amp is similar to the AU999, and many of you more experienced guys have tweeked that out, I'm starting to get excited about the little beast!!!
Driver block F-1159 up next..
Later
I've only recently acquired this amp and it was functioning fine up until I learned a valuable lesson on having my meter set to the right function (mA-ac VS mA-dc, big difference!) As a consequence I blew two outputs doing a bias setup.
I'm gathering up info and so far have got my transistor list about right I think, so I'll post it now and see whether it looks good to go.
Then I'd like to plan choosing caps, other components and any mods going from board to board, following the illustrations given in the service manual. Try to keep it simple and easy to use as a guide. Fyi, I'll be doing all the work myself, about to build a DBT, have a scope but never used it in anger, got a Fluke meter, transistor tester and can't understand schematics other than their symbols.
Output Transistors~
Original - NEC 2SD188 NPN
Replacement - OnSemi MJ21194G NPN
Original - NEC 2SA627 PNP
Replacement - OnSemi MJ21193G
Remaining transistors ~
Original - CDC8002
Replacement - ZTX694B
Original - CDC9002
Replacement - ZTX795A
Original - XA495
Replacement -ZTX795A
Original - 2SC871R (E,F), (F)
Replacement - KSC1845
Will also order KSA1015 & KSC1815 as these could be used here in some chosen places are also good to have anyway.
Because this amp is similar to the AU999, and many of you more experienced guys have tweeked that out, I'm starting to get excited about the little beast!!!
Driver block F-1159 up next..
Later