Output transistor question

[CrazyIvan]

(PL 400 quasi comp) I am replacing the old phase linear XPL909 transistors with new Onsemi MJ21196G transistors I bought from whiteoak. I have the installation list as to where to put what transistors. My question is half of my XPL909's are right side up with the printing on the transistors and the others are upside down. Do I follow this with the installation of the new Onsemi MJ21196G's?

 

[Mohawk]

Have a look at the new devices... The leads are offset.... The holes in the heatsink and sockets will keep EBC correct.

M

 

[CrazyIvan]

I see that now, thanks.

 

[Gepetto]

They only go in one way and have the screw holes line up as Matt indicates...

I suppose you could force the situation but that is not at all recommended

 

[CrazyIvan]

They are in

 

[CrazyIvan]

Is there any reason to replace the remaining 2 SJ2741's ? it definitely has a crisper sound now.

 

[Gepetto]

Is there any reason to replace the remaining 2 SJ2741's ? it definitely has a crisper sound now.

You need those SJ2741s in 2 critical locations...

 

[CrazyIvan]

 

[CrazyIvan]

You need those SJ2741s in 2 critical locations...

should I get new ones? or is that not beneficial if they are working.

 

[George S.]

Nice job, and Lava Lamp.

 

[Gepetto]

should I get new ones? or is that not beneficial if they are working.

Long obsolete and they do not need changing. They do not carry the load. They just provide base drive to the output devices.

 

[Vintage 700b]

View attachment 67182 View attachment 67183

GA-212 Looks Mint Next To Your 400, Nice!

 

[laatsch55]

Nice job, and Lava Lamp.

YEAH!!! Old hippy shit there!!

 

[George S.]

Every system should have at least one!

 

[laatsch55]

Absolutely... Can still be had at American Science and Surplus...

 

[Mohawk]

Anyone ever "white Oaked" a lava lamp ?

You have a kit for those Joe?

 

[J!m]

Yes; it’s called a Tesla Coil.

 

[Gepetto]

Anyone ever "white Oaked" a lava lamp ?

You have a kit for those Joe?

I do have a couple lava lamps...left overs from the kids

 

[CrazyIvan]

GA-212 Looks Mint Next To Your 400, Nice!

I had to put a new belt and bulbs in the GA 212, but it works great now.