[AMPS] SB-230 still works fine.

[Tom Rauch (W8JI)]

The primary problems with the SB-230 are:

1.) It has no grid protection circuit. The grid is easily damaged by
load faults or mistuning

2.) It has no surge limiting resistance in the anode. If the tube ever
arcs, you'll likely wipe out the control grid.

3.) It has inadequate cooling. The heat sink really needs a fan.

73 Tom


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