Sunday 18th October 1998
Hello all
I've got a few tired 4CX1000A ex-broadcast 'pulls', and
want to revitalise them a bit, if it's possible.
Speaking to my friend Bob Kerr GM4FDT, he quoted from the 1925
Admiralty Handbook about how to revitalise Thoriated-tungsten
cathodes/filaments (as used in the larger Eimac tetrodes)
- run the filament for a few hours/days with all other voltages
disconnected - extra Thorium migrates to the surface and the
emission will increase. Also, as the filament reaches the end
of its life, the filament voltage can be increased by say 5% to
improve emission.
Does anyone know of a similar procedure which would give new
life to the 'Oxide-coated unipotential' cathodes of the
4CX1000A/4CX1500B series ?
73 Chris GM3WOJ/GM8V
<chris.tran@zetnet.co.uk>
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