SVT 4 PRO

[Enzo]

Yes, that is the way I read it.

[lowell]

Awesome, well, after soldering that gate lead that I missed before, all seems good. I have all correct bias voltages and bulb is rather dim. I guess that one loose gate lead was allowing leakage and too much current draw through that one MOSFET. Not sure why still however, the bias voltages were so OFF. Could it be that this was causing a largish voltage on the source, and that was feeding back to the limiters and messing with the bias voltage?

[Enzo]

The bulb is used to save the amp from damage when it wants to draw a ton of current. Once you can power it up without maxing the bulb, get rid of the bulb. The bulb is not transparent to the circuit, the circuit won;t work right with the bulb. Voltage readings taken with the mains at 80v AND with the bulb in the circuit are not going to be meaningful.

[lowell]

I'm still so scared the thing is gonna go up in smoke and my 2 weeks of work goes bye bye. But, no guts no glory. The bulb is pretty dim so I guess this is my next step. :-)

[lowell]

Ok set bias voltages to ~+/- 3.5v on the gates for both PAs. Ran each channel at 40w into dummy load for half hour. Seems good. Thanks for the help guys.

[Jazz P Bass]

Whew!

[lowell]

Exactly.