Antique radios, Old Time Radios
1680
 |
| Identical to |
1680
|
| Similar
Tubes |
Normally replaceable-slightly different:
2032; 5915; 6687; 6BY6; E91H; EH900S; EH960
|
| First Source
(s) |
1949 : Tube Lore, Sibley, USA 1996
|
| Production stop |
1956 |
| Successor Tubes |
2032
6BY6
EH900S
|
|
| Base |
Miniatur-7-Pin-Base B7G, USA 1940
|
| Was used by |
Technology / Measurement |
| Filament |
Vf 6.3 Volts / If: 0.3 Ampere / -: Indirect / -: Parallel / series AC/DC / |
| Description |
Designed as logic switching tube: both control grids at 0 V = tube conducts, control grid #1 OR control grid #3 at negative voltage: tube blocked.__[JR]
Pentagrid control (gate) tube, 6BE6 w/ uniform-pitch No. 3 grid to give sharp cutoff at -10 V, w/ treatment to minimize secondary emission. Sold only to IBM and branded „IBM“; replaced 6BE6 in their equipment. Tubes were to be branded w/ IBM part nos. 6B3001 and 303613. Intro. 1949, w/ expected first-year sales of 120,000; withdrawn 1956, in favor of 2032.[Information by L. Sibley]
Text in other
languages (may
differ)
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Collection JR
Jacob Roschy
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Telefunken Taschenbuch 1971
Anonymous 15 Collector
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| Further Information for |
1680 |
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1680 (1680) Discovery of an IBM AND gate
(29.09.2008) Christian ADAM
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Clicks: 563 Replies: 1 |
Dear colleagues,
I recently got the sub assembly shown in attachment one. Thanks to the Rmorg colleagues I could identify the tube as a 1680 made especially for IBM (marked 6B3001). Here the discussion in german:
http://www.radiomuseum.org/forum/unbekannte_baugruppe_mit_e92cc.html
In the report in attachment two I made the schematic of this AND gate and made a simple demonstrator illustrated in the last photo.
I could find nothind using Google and the greatest help came in this case from Rmorg. Thanks to all contributors.
Who knows more?
Best regards from France,
Christian ADAM
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