Antique radios, Old Time Radios
KT55
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Country:
Great Britain (UK)
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| Identical to |
KT55
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| Base |
Octal (Int.Octal, IO) K8A, USA 1935
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| Filament |
Vf 52 Volts / If 0.3 Ampere / Indirect / Specified voltage AND current AC/DC |
| Description |
Pa <25W, Ik <260mA, gm 20mA/V
Designed for low-voltage, high power audio output. The 15W heater power aids the good emission.
Can achieve 25W output in class AB with 200V supply for anode and screen; requires only 20V rms drive to the grids for full power output.
Despite potentially being a better performance tube than the popular KT66, a 6.3V heater version of the KT55 would have required some 2.5A compared with the 1.3A for the KT66.
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Dimensions (WHD)
incl. pins / tip |
53 x 157 x mm / 2.09 x 6.18 x inch |
| Information source |
Universal Vade-Mecum, Electron Valves and Semiconductor Devices group 238 ( group 264 in 1994 edition)
- - Manufacturers Literature
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KT55: From my schematic collection.
Pier Antonio Aluffi
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Just Qvigstad
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KT55: My schematic collection.
Pier Antonio Aluffi
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