What does thickness of the grid leads have to do with VHF parasitic frequency? It would seem that thin leads, having less capacitance to everything else, would tend to raise the frequency, if anything. 73, Bill W6WRT On 1/28/2014 6:14 PM, Carl wrote: > Old tubes will have their parasitic down at low VHF, often right > around 6M due to long thin grid leads.