Antique radios, Old Time Radios
561_deforest
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Country:
United States of America (USA)
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| Identical to |
561_deforest
= 861
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| Base |
Pin-and-blade jumbo (3 contacts)
Sidecontact and top contact.
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 10 Volts / If 11 Ampere / Direct / Specified voltage AC/DC |
| Description |
500 watt screen grid RF power amplifier. Maximum plate voltage 3500,, current 250mA. Used in telephony and telegraphy.
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Dimensions (WHD)
incl. pins / tip |
x 435 x 252 mm / x 17.13 x 9.92 inch |
| Information source |
Radio Engineering August 1930, page 17.
Tube Lore (II) p. 79 & 199
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561_deforest: Fin Stewart
Fin Stewart
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Just Qvigstad
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Collection of
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