[AMRadio] Parasitic Suppressors (or lack thereof) in the Olden Days

[ne1s]

Olden Days being pre-WWII, that is. 

I've noticed most (if not all) if the PP-triode RF PAs of that period don't 
show the use of any parasitic suppressors in the grid or plate leads. Also a 
deck I have (exact vintage unknown) using PP triodes doesn't include them. 

How did they get away with this? 

I've never put power to the above-mentioned deck, but have another one where 
I tried to follow the same practice (I just used copper strap for the plate 
leads) and I appear to have an intermittent parasitic, so will be 
incorporating some suppressors in the plate leads. 

 -Larry/NE1S