Derek92994's 700 Ser II White Oak conversion

[laatsch55]

Pico fuses good? Rail fuses good? Bias trannies test good?

 

[derek92994]

I just tested the socket on dbt with a test plug, it only needed a handful of volts. I have connected variac to mains, dbt to variac and amp to dbt

 

[derek92994]

We tested them before, test picos again?

 

[derek92994]

I dont remember testing bias transistors on backplane, which test method?

 

[laatsch55]

They are NPN, Pos on base, neg on Emitter, just checking for shorts right quick..

 

[laatsch55]

Diode test....

 

[derek92994]

Bias transistors measure

right backplane
843 +on pin 1 -on pin 3
1259 +on pin 1 -on pin 2
698 +on pin 2 -on pin 3
701 -on pin 1 +on pin 2
1360 -on pin 1 +on pin 3
1803 -on pin 2 +on pin 3

Left backplane is around the same

 

[laatsch55]

Bring it up slowly....

 

[derek92994]

Picos, rail fuses and bias transistors all good

 

[derek92994]

Ok 20 volts at a time. Relays click around 120v right?

 

[derek92994]

And if the bulb goes bright, shut it down?

 

[laatsch55]

Relays click around 60 to 80 rail voltage....it'll get bright as caps charge, bring it up slowly in small steps, the bulb should dim as caps charge...

 

[derek92994]

The meters moved around and pegged for a second 20 to 40 volts. I got up to 80 volts and still no bulb glowing??

 

[laatsch55]

Bulb should glow as caps charge...relays click?

 

[derek92994]

No i stopped at 80, try again and go further?

 

[derek92994]

Up to 100 bulb glowing very dim

 

[laatsch55]

No...try and figure why the bulb is not glowing.

 

[laatsch55]

Ahhh....it is glowing. OK, check DC offset on input of DC protect board...

 

[derek92994]

140 volts bulb dim no relay click

 

[laatsch55]

You go to 240 right?