Antique radios, Old Time Radios
1677
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Country:
United States of America (USA)
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| Identical to |
1677
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| Similar
Tubes |
Other class quality (otherwise equal):
25L6GT
Other characteristic (electr. data):
7561
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| First year |
1948
Tube Lore (I)
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| Production stop |
1954 |
| Base |
Octal (Int.Octal, IO) K8A, USA 1935
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| Filament |
Vf 25 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC |
| 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 Introduced 1948 as "25L6GT Code M-34"; withdrawn 1954.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]
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1677: ARRL Handbook 1972
Anonymous 10 Collector
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Just Qvigstad
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