Marantz 1090 Power Amp Transistor Replacement

[kanurys]

Hello, all. I have a 1090 on the bench that had a failure in the power amp driver board. It appears Q718 shorted from the base to the emitter. The transistors in the path current flowed all seem to be effected, though Q718 is the only one with a dead short. I'm going to replace all the effected transistors and their compliments, if applicable. I'd like to make an updated (late)2022 substitution list for my purposes. Any help would be greatly appreciated. Here's what I have so far:

Service Manual: https://www.manualslib.com/manual/697573/Marantz-1090.html

Q709, Q710: ?
Q711, Q712: ?
Q713, Q714: ?
Q715, Q716: ?
Q717, Q718: MJE340G
Q719, Q720: MJE350G
Q721, Q722: TIP41
Q723, Q724: TIP42

Can anyone help with filling in the unknown subs? Also comments on my suggested subs are welcome. Thanks!

 

[rBuckner]

I suggest you fill in what the original part number was to encourage responses.

 

[kanurys]

I suggest you fill in what the original part number was to encourage responses.

Good call. Will do.

 

[kanurys]

Here is my updated list. Thank you all for your input on the questions marks.

Q709, Q710: 2SC1940 >> KSC2690A
Q711, Q712: 2SC828 >> 2N5088
Q713, Q714: 2SC945 >> KSC1845FTA
Q715, Q716: 2SA733 >> KSA992FTA
Q717, Q718: 2SD415 >> MJE340G
Q719, Q720: 2SB549 >> MJE350G
Q721, Q722: 2SB618 >> TIP41
Q723, Q724: 2SD588 >> TIP42

 

[kanurys]

Any comments on the chosen subs or would you go with these?

 

[kanurys]

It's been a while. I'm curious if anyone has any input on the proper substitutions.

 

[quadmatrix82]

Here is my updated list. Thank you all for your input on the questions marks.

Q709, Q710: 2SC1940 >> KSC2690A
Q711, Q712: 2SC828 >> 2N5088
Q713, Q714: 2SC945 >> KSC1845FTA
Q715, Q716: 2SA733 >> KSA992FTA
Q717, Q718: 2SD415 >> MJE340G
Q719, Q720: 2SB549 >> MJE350G
Q721, Q722: 2SB618 >> TIP41
Q723, Q724: 2SD588 >> TIP42

You can get ksc945 and ksa733 would probsbly use those as they should be closer subs than ksc1845 and ksa992 watch the pin out layout

 

[kanurys]

You can get ksc945 and ksa733 would probsbly use those as they should be closer subs than ksc1845 and ksa992 watch the pin out layout

Thanks. I'll add that to the list.

Q709, Q710: 2SC1940 >> KSC2690A
Q711, Q712: 2SC828 >> 2N5088
Q713, Q714: 2SC945 >> KSC1845FTA >> (better subst.) KSC945
Q715, Q716: 2SA733 >> KSA992FTA >> (better subst.) KSA733
Q717, Q718: 2SD415 >> MJE340G
Q719, Q720: 2SB549 >> MJE350G
Q721, Q722: 2SB618 >> TIP41
Q723, Q724: 2SD588 >> TIP42