B5 base...?.....B4
Lotus battery model: S22...HL2...PT240
Lotus all electric: MS4...MH4...PT25
Above taken from make and model listings in this data book that's believed to be circa 1932:
http://www.shinjo.info/frank/sheets/027/...Valves.pdf
All Marconi valves as it's a Marconi data book but plenty of other equivalents.
Lawrence.
Lotus battery model: S22...HL2...PT240
Lotus all electric: MS4...MH4...PT25
Above taken from make and model listings in this data book that's believed to be circa 1932:
http://www.shinjo.info/frank/sheets/027/...Valves.pdf
All Marconi valves as it's a Marconi data book but plenty of other equivalents.
Lawrence.
