Here I show grounding each 3-500Z grid in a Heathkit sb-220
Clarification ...Each tube has 3 connections in parallel with the grid . A 3-500z is a triode which has one grid, a tetrode has 2 grids
if a parasitic oscillation were to occur, You would also destroy the parasitic suppressors between tube anodes and plate choke.
Enjoy
30 июл 2024