nostr:npub1qgf5hejg3t2wa6u8cusvukux8ufm0mxrl6f2vlufftyjzl4ed8gslhx96d It is similsr in principle! I think the main difference is that in the flame tube, the pipe itself forms the resonant cavity that gives rise to the modes you observe, while the gas discharge tube really only visualizes the field generated by resonances in the coil next to it.