Need help to repair two phase 400 amps

[LarryD]

1 526 2 517 3 527 4 522 5 528 6 530 7 524 8 540 9 530 10 517 11 535 12 521 13 532 14 522 15 538 16 531

yes still on diode

 

[laatsch55]

Ok, Black on base , red on emitter....1 thru 16...

 

[LarryD]

1 062 2 090 3 058 4 open 5 060 6 063 7 060 8 open 9 059 10 069 11 063 12 open 13 054 14 060 15 053 16 open

 

[LarryD]

Lee, I have to make a call, be right back!

 

[laatsch55]

OK, , black on base, red on collector....1 thru 16....

 

[LarryD]

ok I'm back.

 

[LarryD]

1 thru 16 open

 

[LarryD]

Wow these guy's are not easy to check! I wonder if it is worth getting all new because of their age?

 

[laatsch55]

Red on emitter, black on collector.....

 

[laatsch55]

They are a 40 year old output, with a much less robust "safe-operating-area" than more modern devices...

 

[LarryD]

1 564 2 559 3 562 4 open 5 569 6 565 7 565 8 open 9 564 10 561 11 565 12 open 13 563 14 557 15 565 16 open

 

[LarryD]

Does anyone make a higher end replacement? and will 909's be ok to change out? And are the seal pats ok to reuse? I also read that the grease was a better option?

 

[laatsch55]

Yes, No, No No...

 

[laatsch55]

Black on emitter, red on collector...

 

[LarryD]

1 thru 16 open I would like to purchase better outputs.

 

[laatsch55]

The 66456's are good. The outputs are not shorted. We don't know if they are all good though. You were blowing fuses correct?

 

[laatsch55]

1 thru 16 open I would like to purchase better outputs.

We're a loooooooooong way from doing that. The old outputs will be sacrificial lambs till we get the board straightened out...

 

[LarryD]

Yes it was blowing fuses. and smoked a little test speaker well done! Ok got it on that!

 

[LarryD]

It looked like #2 was a bit large at one of the checks?

 

[laatsch55]

Were the fuse burns a simple break in the element, or was the inside of the glass blackened?