Difference Between a SB-110 and SB 110A?

[Bob Witmer]

I've just become the proud owner of a Heath SB-110.  The manual is for a
SB-110A.

My question is: What were the differences between the SB-110 and SB-110A - if
any?

Thanks & 73,

Bob,  W3RW

witmerjr at aol.com