linuxslate
Well-Known Member
Looking at the picture, it also seems the lone diode is connected to a separate winding of the power transformer, further indicating that it is a separate filament supply.
The 7591XYZ's filaments are clearly directly powered from a winding on the transformer (not seen in this picture, but clear when looking at the bases of the 7591XYZ's). It may be that they are using a 1/4 rectified and filtered supply for the filaments of the 12AX7's for noise reduction (./?)
I'll trace more wires when I get a moment. It should be very easy to see if something is going from here to the filaments of the 12AX7's.
The 7591XYZ's filaments are clearly directly powered from a winding on the transformer (not seen in this picture, but clear when looking at the bases of the 7591XYZ's). It may be that they are using a 1/4 rectified and filtered supply for the filaments of the 12AX7's for noise reduction (./?)
I'll trace more wires when I get a moment. It should be very easy to see if something is going from here to the filaments of the 12AX7's.