09-02-2022, 09:04 AM
Hi Jeffery.
Indeed the 30P4MR was manufactured for the early V310 a selected valve from the 30P4 stock with less drift, probably the best of them. A 30P19 or standard 30P4 will work. In fact Murphy modified the V310 to a multivibrator only months after initial production started using a 6/30L2 awkwardly hidden behind the mains input.
Indeed the 30P4MR was manufactured for the early V310 a selected valve from the 30P4 stock with less drift, probably the best of them. A 30P19 or standard 30P4 will work. In fact Murphy modified the V310 to a multivibrator only months after initial production started using a 6/30L2 awkwardly hidden behind the mains input.
