1. Standard setup :
A hand-wound pair of output transformers with original input transformers

POM Audio Design Transformers

2. Classic setup :
Original input and output transformers :
Original transformers

Please note that there are no differences between the 1950, 1960s and 1970 version since UTC and TRIAD had the obligation of repeatability
supplying the US Army, and the amount of nickel remains the same accros all versions.
TRIAD Versions