Antique radios, Old Time Radios
WT501-gridless-triode
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Country:
United States of America (USA)
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| Identical to |
WT501-gridless-triode
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| First year |
1923
-- Collector info (Sammler) see text on in English
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| Base |
Swan-Bajonett B15
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 5 Volts / If 0.5 Ampere / Direct / Battery = |
| Description |
By Giorgio Basile: WELSH PEANUT Tube W.T.501 (Gridless Triode). Introduced in 1923, this “gridless triode” was an attempt to bypass the DeForest grid patent by positioning the control electrode outside the glass envelope of the tube. Some tubes were marked as the “Welsh Relay Radion”. The Welsh tube came with a length of wire that was wrapped around a narrow part of the tube. Inside the tube was a filament and a “plate” electrode, which was just a piece of wire bent into a helix. The tube was sold primarily as a replacement for a standard crystal detector (galena crystal and cat's whisker) and was supposed to offer improved performance. It was probably more stable, and required less adjustment, but the sensitivity was probably not much different.
Filament voltage 4-6
Plate voltage 16-22½
Current consumption not over one half Ampere
Text in other
languages (may
differ)
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Dimensions (WHD)
incl. pins / tip |
18 x 60 x mm / 0.71 x 2.36 x inch |
| Tube prices |
2 Tube prices (visible for members
only)
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| Information source |
-- Original prospect or advert G. Eisenbarth, Außensteuerröhren, 2012, S. 47ff
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Just Qvigstad
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WT501-gridless-triode: QST Jan 1923 page 136 Google Books
David Barker
More ...
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Collection of
Collection of a member from D |
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Forum contributions about this tube
WT501-gridless-triode
Threads: 1 | Posts: 3
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Hits: 1173 Replies: 2
Unbekannte Röhre
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Marc Gianella
17.Dec.22
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1
Auf der schweizer Auktionsplattform Ricardo wird unter der Artikelnummer 1220747504 eine unbekannte Röhre angeboten.
Attachments
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Gerhard Eisenbarth
18.Dec.22
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2
Es handelt sich um eine sogenannte Außensteuerröhre, Typ Welsh WT501, hier auch unter dieser Typenbezeichnung zu finden.
Ausführlich ist diese Röhre im GFGF Band 16 "Außensteuerröhren - Ein historisches Röhren-Funktionsprinzip" beschrieben.
Welsh WT501 aus meiner Sammlung
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Marc Gianella
18.Dec.22
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3
Danke Herr Eisenbarth!
Ich habe die Röhre in der Galerie der Seltenen wohl übersehen, da zu sehr auf die Gitterwindung fixiert.
Nun überlege ich sie zu kaufen, es wäre jedoch meine erste Seltene.
Hinzu kommen ca. 140 Autokilometer, auf die Verpackungskünste der Verkäufer ist meist kein Verlass.
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WT501-gridless-triode
End of forum contributions about this tube
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