GRDIII
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Forum contributions about this tube
GRDIII
Threads: 1 | Posts: 3
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Hits: 2230 Replies: 2
GRDIII (GRDIII)
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John Koster
23.Dec.10 |
1
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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Emilio Ciardiello
23.Dec.10 |
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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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John Koster
23.Dec.10 |
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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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GRDIII
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