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Supro 21

Supro 21; National Dobro Co.; (ID = 845087) Ampl/Mixer
Supro 21; National Dobro Co.; (ID = 845088) Ampl/Mixer Supro 21; National Dobro Co.; (ID = 845089) Ampl/Mixer
Supro 21; National Dobro Co.; (ID = 845090) Ampl/Mixer Supro 21; National Dobro Co.; (ID = 845091) Ampl/Mixer
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Supro 21; National Dobro Co.; (ID = 845088) Ampl/Mixer
National Dobro Co.;: Supro 21 [Ampl/Mixer] ID = 845088 933x577
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For model Supro 21, National Dobro Co.; San Louis
 
Country:  United States of America (USA)
Manufacturer / Brand:  National Dobro Co.; San Louis
Year: 1938 ? Category: Audio Amplifier or -mixer
Valves / Tubes 4: 6J7 6F5 6V6 80
Main principle Audio-Amplification
Wave bands - without
Details
Power type and voltage Alternating Current supply (AC) / 110-120 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 6 inch = 15.2 cm
Power out 6 W (unknown quality)
from Radiomuseum.org Model: Supro 21 - National Dobro Co.; San Louis
Material Leather / canvas / plastic - over other material
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 780 x 240 x 170 mm / 30.7 x 9.4 x 6.7 inch
Notes Musical instrument amplifier with lapsteel guitar in case.
Net weight (2.2 lb = 1 kg) 14.8 kg / 32 lb 9.6 oz (32.599 lb)

Model page created by Hannes Gerber. See "Data change" for further contributors.



All listed radios etc. from National Dobro Co.; San Louis
Here you find 13 models, 2 with images and 12 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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