Have been focused on the push pull western amps like 86, 92 or 46. Been looking into the 91a with “R” and we are still going strong learning.
The push pulls have choke and capacitor filtering after the sublime 274a/b. I was surprised to learn that the 91a is restitor capacitor. Also the 91a/b hosts 25uf electrolytic capacitors that in western electric terms compared to the we1086 is high.
If any audio16 readers could help understanding the reasons here it will be appreciated.