[Top Cap]

I agree with that Ed, perhaps a fairly meaty secondary for those more hungry valves. To cater for the 1.4/2V directly heated valves, perhaps a rectifier and smoother fed by the 4V Tap and use a simple transistor regulator to switch it between 1.4 or 2V, the current would not be too much, especially the 1.4V types. I have very few battery valves but appreciate there are others who may have a special interest in these and would appreciate it. Obviously one cannot cater for all types, the range of heater voltages are too diverse so the option of a separate heater input is really a must. The transformer rating is complicated further by those wishing to have continuous running as an option in addition to just a quick test. Maybe the separate heater input terminals would also be a better option for continuous operation use.
Shrouds? If the transformer was visible perhaps, but for a piece of test gear an open transformer, with its cost reduction, would be quite acceptable here.
Les