406 Chapter 13
Alternatively, TO3s can be mounted off PCB (e.g., if you already have a large heat sink
with TO3 drillings) with wires taken from the TO3 pads on the PCB to the remote devices.
These wires should be fastened together (two bunches of three is fi ne) to prevent loop
formation; see earlier discussion. I cannot give a maximum safe length for such cabling,
but certainly 8 inches causes no HF stability problems. The emitter and collector wires
should be substantial, for example, 32/02, but the base connections can be as thin as 7/02.