The following link to various views of the Aspidistra.
They are all quite large, but I will endeavour to reduce them shortly.
From right to left, the transmitter bays are:
Low power exciter
High power exciter, 25kW
PA (three power amplifiers in series, each 200kW)
Modulator (out of shot).
Top row: Stoppage timer, peak programme meter, GMT clock, peak programme meter, Outage duration timer.
Below: Isolation buttons (PAs A, B & C), Master audio control, PA filament start switches.
On table: Log book.
One of the three masts falling on demolition.
A young Les Rawlings, G3FET, holding one of the original GL898 valves. They were air and water cooled with three-phase filaments and 50kW anode dissipation. There were 26 of these valves in Aspidistra: 4 in each PA, 4 in each modulator and 2 in the high power exciter. The PAs were parallel push-pull, class C and the three were connected in series. The modulators were class B. The picture is taken in front of the low power exciter stage of Aspidistra. The original LP exciter was lost at sea with one of the original masts and had to be replaced before commissioning