Is the single-head tube better for the inner lead structure or the outer wiring structure?

1. The form of paper is not the same

The inner lead is the lead of the single-head heating tube indirectly drawn from the tube, and the external report is drawn from the heating tube by the receiving column and then connected to the lead.

2. The function is not the same

The inner lead is not broken when it is internally compressed, and the external report breaks more easily.