local demolition of SAGE building

[lee davison]

> For transmitting tubes (valves), yes, careful power-up is
> important, but for computer rated minis, not so much.

Not just the Tx valves, all the valves from the synthesiser
on were protected, the exception was the audio pre-amp which
were the cause of > 50% of shutdowns until replaced by solid
state units.

> If anything, the a slow power-up is probably protecting the
> power supplies more than the tubes.

Not in these transmitters.

> Weak filaments that lead to burnouts and loose elements that
> lead to shorts generally get weeded out quickly, as the tubes
> die prematurely.

New valves are always run for the guarantee life, modern valves
are very poor, more than half are either DOA of fail within
the guarantee period.

Lee.










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