GRDIII (GRDIII)

ID: 240335
This article refers to the component: To the tube/semiconductor

GRDIII (GRDIII) 
23.Dec.10 12:24
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John Koster (NL)
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John Koster

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? 
23.Dec.10 13:53
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Emilio Ciardiello (I)
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Emilio Ciardiello

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 
23.Dec.10 14:37
31 de 2312
John Koster (NL)
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John Koster
Dear Emillio,
 
All Philips GRD (followed by a Roman figure, e.g. II or IV) tubes were used in municipal wire distribution systems in the Netherlands. Most of them were also part of a series of Philips tubes numbered from 4600 to 4700. The GRDIII is also a 4603 tube. The tubes in the 4600 to 4700 range were made for professional use. Some of them have a commercial equivalent. For instance 4610 = E442 and 4693= EF8.
 
Regards,
 
John

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