[Amps] amp tubes

[Tom W8JI]

> edge itself. Every transformer they designed was this way. 
> Some might argue they
> were designed tougher, but I did some comparisons, and 
> calculations using the core
> size, and they were smaller as compared to others.

Will,

Since you made calculations, you must have known the core 
material used.

 How did you learn the type of core material Heath used?

How did you know the core material used in the other 
transformers?

Thanks,
Tom