Farad unbased triode #58 B
Early indirectly-heated AC tube.
Note the twin heater-cathodes.
![Farad unbased triode #58 B](rt125a.jpg)
Hauteur • Height • Höhe : 113 mm • 4" 4/10
Diamètre • Diameter • Durchmesser : 44 mm • 1" 7/10
![Farad unbased triode #58 B](rt125b.jpg)
![Farad unbased triode #58 B](rt125c.jpg)
![Farad unbased triode #58 B](rt125d.jpg)
![Farad unbased triode #58 B](rt125e.jpg)
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