Peter Heembrock
Forum Participant

Hi Bob,

For a fuse size I always use a 1 amp slow blow due to the heater current inrush…
The fuse should always be the first item connected to the hot lead of the power cord before the switch ( in case of a switch failure ).

I do all of my AA5 radios like this…electrical safety standards were still evolving in the 40’s and 50’s.