Derek92994's 700 Ser II White Oak conversion

[laatsch55]

Sorry Darc, control board, no TO-220's on the backplanes...

 

[derek92994]

No bell on the 10.7

 

[laatsch55]

10 ohm bias and .7 on emitter...

 

[derek92994]

To clarify, to220s pins down writing towards you, B,C,E pins in that order?

 

[laatsch55]

180 is resistor accross the bottom output..

 

[laatsch55]

Base on left, not sure on the other two without a data sheet in front of me!!

 

[derek92994]

Assuming the to220s go bce left to right:
To220 bottom left
B- to E+ 1490
B- to C+ no value
E- to C+ no value
B+ to E- 584
B+ to C- 584
E+ to C- 491
To220 bottom right
B- to E+ 577
B- to C+ 575
E- to C+ 753
B+ to E- 1520
B+ to C- no value
E+ to C- no value

 

[laatsch55]

Good to go there....ya got lucky bud. Do you have new sil-pads?

 

[derek92994]

Good to go there....ya got lucky bud. Do you have new sil-pads?

No sil pads but old ones seem ok

 

[laatsch55]

No, they are not, I see some tears. Get some of those and a new output. Got a source there?? Don't get just 6 sil-pads, get 30, 6 for now and 24 spares. Do you have spare AGX 5 amp fuses?

 

[derek92994]

Got spare fuses, will chase up outputs and sil pads

 

[derek92994]

By the way, I believe if a fuse blows, its best to investigate, not just replace, they blow for a reason :evil4
Main power fuse I can understand, replaced one of those from turn on fatigue.

 

[laatsch55]

After you put in the outputs, set the amp like normal and take some isopropol alcohol after the rosin on the backplane . Short, stiff bristled brush, and dip and scrub, they're called chemical brushes here.

 

[derek92994]

Once I have replaced that output, and sil pads, do I bring it up on the variac?

 

[derek92994]

Ok will clean the boards up also

 

[derek92994]

So outputs can just go even if not stressed all the time?

 

[laatsch55]

Absolutely bring it up on the variac!! And DBT....

 

[derek92994]

No DBT here. But yea will use variac. Thank you for your time bud, its great to get some clarity and a solution

 

[laatsch55]

So outputs can just go even if not stressed all the time?

Darc, I've roasted some that were a week old.....got them really hot of course, but yeah, when ya push stuff hard, shit can happen....and who's to say it was as good as the rest....just never know....that's why we love DCP boards. If you had one later generation backplane you wouldn't have to solder in outputs....THAT IS A PITA.....youre doin good Darc..

 

[derek92994]

Darc, I've roasted some that were a week old.....got them really hot of course, but yeah, when ya push stuff hard, shit can happen....and who's to say it was as good as the rest....just never know....that's why we love DCP boards. If you had one later generation backplane you wouldn't have to solder in outputs....THAT IS A PITA.....youre doin good Darc..

yeah all the practice helps bud. So lucky for DC protect. The outputs got easier to remove 2nd go. No magnet either.