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AUDIO VALVES: EZ81 U709 UU12 CV5072 6CA4 RECTIFIER

The EZ81 was introduced by Mullard as a high current B9A rectifier, the low power rectifier offered by Mullard was the 90 mA EZ80. Prior to the EZ81 Mullard designs used the GZ34.    in use the maximum reservoir capacitor would be limited to 50 µF and to prevent damage by excess current an effective series resistance of 230 Ohms is used.  The thin glass tube envelope is 19 mm in diameter and, excluding the B9A base pins, is 70 mm tall.    The EZ81 saw much use in classic hifi and classic guitar amplifier designed including such exotics as:-

Bogen DB230

Cary SLP90

Concert Fidelity Pre-amp

Marshall EL84 guitar amp

Reinhardt SVT-18 guitar amp

Wright Sound phono stage

 

 

 

EZ81 , MAZDA, UU12, WHITE PRINT, BRITISH MADE, 1963 MANUFACTURE

EZ81 , MAZDA, UU12, WHITE PRINT, BRITISH MADE, 1963 MANUFACTURE
EZ81 ,MAZDA, WHITE PRINT,

EZ81 ,MAZDA, WHITE PRINT,
EZ81 ,MAZDA, WHITE PRINT, NS APRIL 1961 MANUFACTURE

EZ81 ,MAZDA, WHITE PRINT, NS APRIL 1961 MANUFACTURE
EZ81 ,ZAERIX, BOXED NOS, WHITE PRINT,

EZ81 ,ZAERIX, BOXED NOS, WHITE PRINT,
EZ81 MULLARD OLD SHIELD WHITE PRINT BRITISH MADE

EZ81 MULLARD OLD SHIELD WHITE PRINT BRITISH MADE
EZ81 MULLARD OLD SHIELD WHITE PRINT, 8f1 XXX,

EZ81 MULLARD OLD SHIELD WHITE PRINT, 8f1 XXX,
EZ81 MULLARD OLD SHIELD WHITE PRINT, 8t1 B8K, BLACKBURN 1958 MANUFACTURE

EZ81 MULLARD OLD SHIELD WHITE PRINT, 8t1 B8K, BLACKBURN 1958 MANUFACTURE
EZ81, Brimar, White Print ,British Made

EZ81, Brimar, White Print ,British Made
EZ81, MULLARD, OLD SHIELD, YELLOW PRINT, 8t1 B7D5, BLACKBURN APRIL 1967 MANUFACTURE

EZ81, MULLARD, OLD SHIELD, YELLOW PRINT, 8t1 B7D5, BLACKBURN APRIL 1967 MANUFACTURE
EZ81, Philips, Grey Print, 8t1 53y, Barcelona, 1963 Production

EZ81, Philips, Grey Print, 8t1 53y, Barcelona, 1963 Production