Self inflicted wound

[Gepetto]

Forget that last post. The fuses were not installed. With the fuses in I now read with variac at 120 volts .249 volts on the bias. Bulb is faintl glowing. I’ll see what happens when I reinstall the 4th row. Probably just a brain fart on my part. May not be tonight. Thanks

You need fuses to get any bias readings, Hopefully you are still good despite the mishap.

 

[Gepetto]

This is where contact was made. I don’t recall taking the variac beyond 30-35 volts because the DBT stayed bright. I only powered it up for a few seconds. I pulled the outputs from that 4th row and they tested good. The others are still in place. View attachment 64992

Steve, shoot us a photo of the output terminal section of your amp while you are here...see if we can pick up any other pointers to help you out.

 

[Steve K]

Where exactly would that be?

 

[Steve K]

Maybe these will help.

 

[Steve K]

I still need to tin the wire ends and dress everything up. Then onto the input wiring. That is provided I don’t mess anything else up on the way.

 

[laatsch55]

Steve, from the photos, it looks like some of those solder joints on the emitter resistor common tie points might be cold? Do they look different in person?

 

[Gepetto]

Maybe these will help. View attachment 65002 View attachment 65001 View attachment 65000

Cannot really see it, the DC Protect is in the way. Just ensuring that the copper ground plate is isolated from the chassis and that the buss wire jumper that Phase Linear put in from the copper plate to the frame of the Normal/Direct switch has been removed. That is a ground loop problem that will cause you hum problems.

 

[Steve K]

Thanks for looking Lee. The joints are pretty solid they just don’t show up well in the pictures. Joe the copper plate is there insulated from the chassis and wired per your updated ground scheme. Thanks!

 

[Gepetto]

Thanks for looking Lee. The joints are pretty solid they just don’t show up well in the pictures. Joe the copper plate is there insulated from the chassis and wired per your updated ground scheme. Thanks!

Thank you for reading the instructions Steve