Antique radios, Old Time Radios
307A
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Country:
United States of America (USA)
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Brand:
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| Tube type: |
Vacuum Pentode Power/Output |
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| Identical to |
307A
= VT-225
= 3307
= RK75
= 3307A
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| Base |
UY-Base, 5 Pins (USA, April 1927) (Codex=Hr)
Top contact with a cap.
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| Filament |
Vf 5.5 Volts / If 1 Ampere / Direct / Specified voltage AC/DC |
| Description |
Power pentode, transmitting up to 40MHz or audio applications. Similar to 306A with quick heating filament. Third grid brought out to make possible the use in suppression grid modulator circuits.
Ken-Rad, National Union, Raytheon, Sylvania, WE known manufacturers.
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| Tube prices |
2 Tube prices (visible for members
only)
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| Information source |
Taschenbuch zum Röhren-Codex 1948/49
- - Manufacturers Literature
Tube Lore (I)
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307A: ARRL Handbook 1972
Anonymous 10 Collector
More ...
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Just Qvigstad
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307A: own collection
Peter den Boer
More ...
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
Collection of
Collection of a member from FIN |
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