Re: Valve Items - Philips/Mullard Rimlock-to-Noval Transition
Most B8A valves were obsolete before they started to be made in B9A style, but the UL41 is quite commonly available like that - Tungsram made lots of them. There must have been a healthy domestic replacement market, and they also appear to have been used in military equipment. Late UL41s have redesigned heaters which make them less liable to develop heater/cathode leaks, but they take quite a while to warm up as a result.
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