 |
| Identical to |
1677
|
| Similar
Tubes |
25L6GT (other class quality (otherw. equal))
|
| First Source
(s) |
1948 : Tube Lore, Sibley, USA 1996
|
| Production stop |
1954 |
|
| Base |
Octal (Int.Octal, IO) K8A, USA 1935
|
| Was used by |
Industrial |
| Filament |
-: Indirect /
-: Parallel / series AC/DC /
If: 0.3 Ampere /
Vf 25 Volts /
|
| Description |
Power pentode, 25L6GT w/ special (original-design) screen grid and unique testing. Sold only to Bristol Co., Waterbury, CT; in min. Lots of 5000; and used in their industrial furnace-control equipment. Introduced 1948 as „25L6GT Code M-34“; withdrawn 1954. Replaced selected 25L6GTs made according to the original tube design; later cost- reduced 25L6GTs could not meet selection criteria. A special run of 15,000 tubes was made in 1949. Tubes were to be branded "1677" and selected by Bristol; those returned as not meeting requirements were to be salvaged and rebranded as 25L6s. Later furnace controllers used a 6C4 and 2D21 instead.[Information by L. Sibley]
|
|
|
|
|
|
ARRL Handbook 1972
Michael Schlör
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