skrasms
Well-known member
I'm looking at old tube compressor schematics and noticing a lot of the tubes have suffixes like WGT, GTY, WGTA, and things along those lines. My hunch, based on a girth of complete inexperience, is that these are military spec tubes that just spec out better than their counterparts without the corresponding suffixes. Is that right? Would I be able to use a standard 5Y3 in a circuit that calls for a 5Y3WGTA, or is there more involved?