Altec 9440a Transistor subs

[rstsgsas]

Noob here,just got an Altec 9440a with a blown channel ,I can fix it but I need some transistor subs,2n6421 to66 ,2n3584 to66 and the tz255 which i have not a clue what it is.Its on the parts list altec pn 48-03-12235-02 Any help would be appreciated.

[zelgall]

Replace the 2N3584 with MJE15032GOS-ND MJE15032G TRANS PWR NPN 8A 250V TO220AB ON Semiconductor NPN 250V 8A TO-220AB

Replace the 2N6421 with MJE15033GOS-ND MJE15033G TRANS PWR PNP 8A 250V TO220AB ON Semiconductor PNP -250V -8A TO-220AB

These are the common replacements in a variety of amplifiers that use your transistors.

See this link: Datasheet catalog for integrated circuits, diodes, triacs, and other semiconductors, view to crosscheck and verify that the specs are equivalent.

[rstsgsas]

Does it matter that the originals are TO66 (mini TO3) and the MJE 'S are TO 220ab?Any ideas on the tz255 part. Thanks

[zelgall]

The specs are the same but the case size is different. If you search on the linked site, they have links to suppliers that have your transistors.

[bfish]

It might be too early to help with a 9440, but there's some Altec transistor sub info in this old tech letter;

http://alteclansingunofficial.nlenet...rs/TL_175A.pdf

The item I had the most trouble finding new subs for were the Moxies (the two little thermal devices you can see through the holes in the heat sinks). I think I could dig up that info if it's ever needed. I might've even posted it here somewhere.

[rstsgsas]

Thanks for the info,some useful subs there.I am trying to get my ducks in a row before I dig into this. q9 of the schematic is a bias transistor tz255 is the altec number its part of the adjustment circuit with a variable resistor.I cannot find a reference anywhere on the net to it.I am not sure what will be needed ,just trying to see what is available. I will post later what I find and hopefully those thermal devices you speak of are still good.Digging for diodes too. I will update as I go. Thanks