JBL SA600 POWER AMP BOARD Trs

D

dksim

Member
Can not find any match replacement trs information SA600 power amp board transistors.
One ch dead find two registers brown out and checked q5 and q6 they are short need replace but can not find which one can right replacement tr.
Need your help...........Q3,Q4,Q5(JBL Part #12546 NPN) and Q6(JBL Part #12545 PNP) best match choice..
Thankssa600 power board.jpg
 
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How does these circuit breaker test good or replace them if need to replace it any spec for these lamp type CB( JBL SA600)
Thanks
20210705_215627[1].jpg
 
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This is timely. I have an SA-660 on the bench with some bum parts. Wasn't aware of the SA-600 but some digging turns up a service manual that covers both, along with a complete schematic that covers both units so I have to say thanks for posting this and making me go have a look. Looks like there is only a slight difference in the power amp to include protection diodes and a few volts extra at the supply rails.

I don't have what I picked for cross-references for the small transistors handy at the moment but I can get you that when I get home. I picked different stuff, hopefully both of them work out. I really hate proprietary numbers that don't at least get to a datasheet. I can also dig up the part numbers I ordered for new mica sheets for the TO-3 and TO-66. There are several options that all fit, but only one is an exact dimensional match to the originals.


If its a breaker, my assumption is that it should read 0 ohms normally. If it reads open circuit or high resistance it tripped and did not reset. Replacing, no idea. You'd need to know the trip current. If nothing exists, a fuse might be the practical sub here.
 
output transistors MJ15015G / 15016G
Q5/Q6 TO-39 transistors BC141 / BC161
TO-66 insulators Keystone 4666
TO-3 insulators Keystone 4652

I'm pretty far from a solid state guru so those are at least partly educated guesses. I'm sure those output transistors are gross overkill, a 2N3055 and whatever the compliment is would probably have done just fine but the MJ parts were slightly less expensive and considerably up-rated.
 
gadget73 said:
output transistors MJ15015G / 15016G
Q5/Q6 TO-39 transistors BC141 / BC161
TO-66 insulators Keystone 4666
TO-3 insulators Keystone 4652

I'm pretty far from a solid state guru so those are at least partly educated guesses. I'm sure those output transistors are gross overkill, a 2N3055 and whatever the compliment is would probably have done just fine but the MJ parts were slightly less expensive and considerably up-rated.
Click to expand...
Any recommend Q7,Q8 drive transistors TO-66 type?
Thanks
 
I honestly don't know. The ones in this one measure good, so my hope is I won't have to figure out a sub. There aren't that many options though so its likely to be a pretty short list of possibilities.
 
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