David, Looking at the service manual, the Main indicator is D1, V11-3163-16, LED TLY-505 Main. Hope that this helps! Bob - N0DGN On 3/4/2010 4:23 PM, David C. Hallam wrote: > What is the bulb used behind the frequency dial on a VFO-120. The > manual has no bill of materials and the schematic refers to it only as a > pilot light. > > David > KW4DH >