[R-390] B+ current

[wli]

So, if I am reading Don's post re B+ current correctly, one important concept is that cathodic vacuum rectifiers, such as the expensive 26Z5, does add a small delay until they pass current, thus allowing the receiver tubes to warm up, and allows the choke input filter to *see* a load.... unlike the behavior seen with silicon diodes.

So the substitution of a cheaper 12BW4 for the expensive 26Z5 makes sense. My R390A's have this tube substitution in the PS modules, and it works swell for me. With a line input of 120VAC, my B+ at the plate of V603 is 215v.