[Ed_Dinning]

Hi Eric, the transformer was designed with an intermittent duty cycle in mind as a means of keeping the cost down. A transformer to allow soak tests over a long period would be at least twice the size (and cost). The heatsinking of the power supply regulators would also need to be increased

For a similar reason I did not add heater windings to cover the multitude of voltages and currents that are used on the full range of valves that could be encountered.

In terms of higher voltages for the valves you would like to test, you may again need to look at the Sussex regulator circuits, as well as the switching, as it may not be suitable for these higher voltages.

Feel free to mail me if you need to discuss any of these points.

Ed