That sounds somewhat weird! The outer two tags being linked together is normal - it is what completes the bridge. [1] Without the circuit it is difficult to judge what, exactly, is going on. I assume from the component numbering that R15 and R16 are connected together - is that right?
If you could post a snippet of the relevant part of the circuit, together with component values, it would make it much easier for me and others to help you - at the moment it is a case of guessing in the dark!
As for the voltage required by the valves themselves, 1.3V is a good choice to aim for.
I know that Michael Watterson went into this in some considerable detail some while ago but I'm not sure if it was here, on VRAT or UKVRRR.
[1] Looking at your pictures, the configuration of this bridge looks somewhat unusual. if the green tags are AC, one of these is at the end of the stack, which is odd. The usual connection order is : +ve, AC, -ve, AC, +ve with the two positive tags linked together as I said.
If you could post a snippet of the relevant part of the circuit, together with component values, it would make it much easier for me and others to help you - at the moment it is a case of guessing in the dark!
As for the voltage required by the valves themselves, 1.3V is a good choice to aim for.
I know that Michael Watterson went into this in some considerable detail some while ago but I'm not sure if it was here, on VRAT or UKVRRR.
[1] Looking at your pictures, the configuration of this bridge looks somewhat unusual. if the green tags are AC, one of these is at the end of the stack, which is odd. The usual connection order is : +ve, AC, -ve, AC, +ve with the two positive tags linked together as I said.
