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AUDIO VALVES: 6X4 CV493 CV4005 EZ90 U78 RECTIFIER

The 6X4 is a miniature HT rectifier following the normal pattern for a full wave device in that a common cathode is employed.

At 325-0-325 input to the rectifier this will give an HT rail higher than is required for most domestic receivers. Use for audio amplifiers and small transmitters is most probable, or driven at 250 volts for radio receivers. The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 59 mm tall.

These valves saw duty in many of the smaller classic hifi amplifiers and guitar amplifiers, however, here's a list of some exciting exotica that also uses them:-

Audio Note DAC 1.2

Eastern Electric
KONDO KSL M7 preamp
LAMM LP2 Deluxe Phono
Musical Surroundings
Sears Silvertone 1482 Guitar amp 1965-1966
Wright WPP200C
YS Audio Symphonies + preamp

6X4 ,BRIMAR ,WHITE PRINT, 1960s MANUFACTURE

6X4 ,BRIMAR ,WHITE PRINT, 1960s MANUFACTURE
6X4 BRIMAR ORANGE PRINT 1959 MANUFACTURE

6X4 BRIMAR ORANGE PRINT 1959 MANUFACTURE
6X4 BRIMAR WHITE PRINT 1960s MANUFACTURE

6X4 BRIMAR WHITE PRINT 1960s MANUFACTURE
6X4 TUNG-SOL USA 1960s MANUFACTURE

6X4 TUNG-SOL USA 1960s MANUFACTURE
6X4, BRIMAR, LIMITED WHITE PRINT, BLACK GLASS

6X4, BRIMAR, LIMITED WHITE PRINT, BLACK GLASS
6X4, BRIMAR, LIMITED WHITE PRINT, DEC 1961 MANUFACTURE

6X4, BRIMAR, LIMITED WHITE PRINT, DEC 1961 MANUFACTURE
6X4, BRIMAR, LIMITED WHITE PRINT, MARCH 1954 MANUFACTURE

6X4, BRIMAR, LIMITED WHITE PRINT, MARCH 1954 MANUFACTURE
6X4, BRIMAR, ORANGE PRINT, FEBRUARY 1954 MANUFACTURE

6X4, BRIMAR, ORANGE PRINT, FEBRUARY 1954 MANUFACTURE
6X4, BRIMAR, WHITE & RED PRINT, JUNE 1961 MANUFACTURE

6X4, BRIMAR, WHITE & RED PRINT, JUNE 1961 MANUFACTURE
6X4, BRIMAR, WHITE PRINT, GREY GLASS OCTOBER 1956 MANUFACTURE

6X4, BRIMAR, WHITE PRINT, GREY GLASS OCTOBER 1956 MANUFACTURE
6X4, BRIMAR, WHITE PRINT, GREY GLASS, SEPTEMBER 1957 MANUFACTURE

6X4, BRIMAR, WHITE PRINT, GREY GLASS, SEPTEMBER 1957 MANUFACTURE
6X4, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, 1956 MANUFACTURE

6X4, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, 1956 MANUFACTURE
6X4, MULLARD, WHITE PRINT, BLACKBURN APRIL 1957 MANUFACTURE

6X4, MULLARD, WHITE PRINT, BLACKBURN APRIL 1957 MANUFACTURE
6X4, SYLVANIA, NOS IN ZAERIX BOX, GREEN PRINT, APRIL 1976 PRODUCTION, 6X4W

6X4, SYLVANIA, NOS IN ZAERIX BOX, GREEN PRINT, APRIL 1976 PRODUCTION, 6X4W
6Z4J, B7G, RECTIFIER VALVE, FOR LITTLE BEAR AMP, T10, NOS

6Z4J, B7G, RECTIFIER VALVE, FOR LITTLE BEAR AMP, T10, NOS
CV4005, MIL SPEC 6X4, GEC, HAMMERSMITH JANUARY 1952 MANUFACTURE, FAINT PRINT

CV4005, MIL SPEC 6X4, GEC, HAMMERSMITH JANUARY 1952 MANUFACTURE, FAINT PRINT
CV4005, MIL SPEC 6X4, GEC, HAMMERSMITH MARCH 1964 MANUFACTURE, BOXED NOS

CV4005, MIL SPEC 6X4, GEC, HAMMERSMITH MARCH 1964 MANUFACTURE, BOXED NOS
CV493, BRIMAR, MIL SPEC, 6X4, WHITE PRINT, 1955 MANUFACTURE

CV493, BRIMAR, MIL SPEC, 6X4, WHITE PRINT, 1955 MANUFACTURE
CV493, BRIMAR, MIL SPEC, 6X4, WHITE PRINT, OCTOBER 1955 MANUFACTURE

CV493, BRIMAR, MIL SPEC, 6X4, WHITE PRINT, OCTOBER 1955 MANUFACTURE
CV493, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, AUG 1952 MANUFACTURE

CV493, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, AUG 1952 MANUFACTURE
CV493, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, FACTORY CODE Yy1 J6D, 1956 MANUFACTURE

CV493, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, FACTORY CODE Yy1 J6D, 1956 MANUFACTURE
CV493, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, ORTHOGONAL CARTOUCHE, AUGUST 1952 MANUFACTURE

CV493, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, ORTHOGONAL CARTOUCHE, AUGUST 1952 MANUFACTURE
CV493, MULLARD, MIL SPEC 6X4, WHITE PRINT, BLACKBURN 1957 MANUFACTURE

CV493, MULLARD, MIL SPEC 6X4, WHITE PRINT, BLACKBURN 1957 MANUFACTURE
EZ90, PINNACLE BADGED GE, BOXED, NOS, 6X4

EZ90, PINNACLE BADGED GE, BOXED, NOS, 6X4