6x5gt ez35 CV572 6X5 tube rectifier FIVRE italy MONO PLATE valve PRE amp black

one single tube 6x5gt fivre made in Italy old production 

black mono plate 

brown base

yellow label of old production 

fully Tested with TV7

results as follow 60/54 (reference good start at 40/40) with old Fivre box red and black

6X5 = VT-126 = 6Ц5 = CV573 VT-126B Full-Wave Vacuum Rectifier 

Base K8A 

Filament Vf 6.3 Volts / If 0.6 Ampere / Indirect. 

Perfect tubes for preamplifier preamp Pre-Amplifier

PREDECESSOR OF 7025 TUBES

box 142