GRDIII (GRDIII)
GRDIII (GRDIII)
GRD-tubes were used in municipal wire broadcasting networks (G.R.D., Gemeentelijke Radio Distributie) in the 1920s and 1930s in the Netherlands. It als bears the Philips number 4603. These were a series of tubes in the range 4600-4700 for professional use.
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Was GRDIII a tube or a system?
Dear John,
it is not clear whether GRDIII was a tube or a radiocontrolled distribution system based upon professional 4600-4700 series Philips tubes.
In the text you refer to a series of tubes in the range 4600-4700. But you also write of GRD tubes and all the text is linked to a single GRDIII tube. Do you have more details about?
Many thanks,
Emilio
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GRD tubes
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