6X4- 6X5 - EZ90 - 6202 - 6Z4
The 6X4 series of rectifier tubes can be very confusing because most of the substitutes and/or equivalent tubes need adapters.
Equivalent & Drop-In Substitutes:
6X4: 6X4, EZ90, CV493, 6063, 6X4W, CV4005, 6202, 6BX4, 6X4WA
6X5
The 6X5 is just a 6X4 with a large octal base. While they are the same electrically, they are almost never interchangeable with 6X4 due to their size.
Substitutes: 6X5GT, 6X5GTA, 6X5WGT
6Z4 (Chinese)
This is where things get very confusing. There is a popular Chinese tube called the 6Z4. There is also a large American 6Z4 reciter which is in no way related to the Chinese 6Z4. When shopping it should be very obvious which one is which is the American version is an old 6 pin tube and is quite large.
The 6Z4 is simply a 6X4 with a different pinout, so you can run a 6X4 as a 6Z4 but only with the appropriate adapter.
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Tests NOS Date Matched Pair CBS Hytron 6X5GT Black Pl Foil Getter 3 Mica Tubes
CBS Hytron
$37.95ATTENTION INTERNATIONAL BUYERS - Please Read Our Shipping Terns, Standard Shipping can take up to 3 MONTHS Tube Type / Number: 6X5GTActual Brand*: CBS HytronPrinted Brand: HytronQuantity: 2 Pieces-Matched PairMatching Date Codes? YesPlate...BP3579$37.95 -
Tests NOS Matched Pair CBS Hytron 6X5GT Black Plate 3 Mica Tubes
CBS Hytron
$24.95ATTENTION INTERNATIONAL BUYERS - Please Read Our Shipping Terns, Standard Shipping can take up to 3 MONTHS Tube Type / Number: 6X5GTActual Brand*: CBS HytronPrinted Brand: HytronQuantity: 2 Pieces-Matched PairMatching Date Codes? NoPlate...BP3587$24.95 -
Tests NOS Matched Pair CBS Hytron US 6X5GT Black Plate 3 Mica Tubes
CBS Hytron
$24.95ATTENTION INTERNATIONAL BUYERS - Please Read Our Shipping Terns, Standard Shipping can take up to 3 MONTHS Tube Type / Number: 6X5GTActual Brand*: CBS HytronPrinted Brand: CBSQuantity: 2 Pieces-Matched PairMatching Date Codes? NoPlate Construction:...BP3586$24.95 -
Tests NOS Date Matched Pair CBS Hytron 6X5GT Black Plate 3 Mica Tubes
CBS Hytron
$37.95ATTENTION INTERNATIONAL BUYERS - Please Read Our Shipping Terns, Standard Shipping can take up to 3 MONTHS Tube Type / Number: 6X5GTActual Brand*: CBS HytronPrinted Brand: HytronQuantity: 2 Pieces-Matched PairMatching Date Codes? YesPlate...BP3581$37.95 -
Tests NOS Matched Pair (2x) CBS Hytron USA 6X5GT Black Plate 3 Mica Tubes
CBS Hytron
$24.95ATTENTION INTERNATIONAL BUYERS - Please Read Our Shipping Terns, Standard Shipping can take up to 3 MONTHS Tube Type / Number: 6X5GTActual Brand*: CBS HytronPrinted Brand: HytronQuantity: 2 Pieces-Matched PairMatching Date Codes? NoPlate...BP3590$24.95 -
Tests NOS Matched Pair 2x CBS Hytron USA 6X5GT Black Plate Foil Get 3 Mica Tubes
CBS Hytron
$24.95ATTENTION INTERNATIONAL BUYERS - Please Read Our Shipping Terns, Standard Shipping can take up to 3 MONTHS Tube Type / Number: 6X5GTActual Brand*: CBS HytronPrinted Brand: CBS & Stromberg-CarlsonQuantity: 2 Pieces-Matched PairMatching Date Codes?...BP3589$24.95 -
True NOS NIB Matched Pair RCA USA 6X4 [EZ90] Black Plate Foil Strip Get Tubes
RCA
$64.30ATTENTION INTERNATIONAL BUYERS - Please Read Our Shipping Terns, Standard Shipping can take up to 3 MONTHS Tube Type / Number: 6X4 [EZ90]Actual Brand*: RCAPrinted Brand: RCAQuantity: 2 Pieces-Matched PairMatching Date Codes? NoPlate Construction:...BP3504$64.30 -
Tests NOS Matched Pair Mullard Britain 6X4 EZ90 Grey Plate Blackburn Tubes
Mullard
$178.15ATTENTION INTERNATIONAL BUYERS - Please Read Our Shipping Terns, Standard Shipping can take up to 3 MONTHS Tube Type / Number: 6X4 [EZ90]Actual Brand*: MullardPrinted Brand: SonotoneQuantity: 2 Pieces-Matched PairMatching Date Codes? NoPlate...BP3449$178.15 -
Hi-Fi Audio NOS NIB Date Matched Pair RCA 6X4 [] Dimple Foil Strip Vacuum Tubes
RCA
$119.85Tube Type / Number: 6X4 [EZ90] Actual Brand*: RCA Printed Brand: RCA Quantity of Tubes: Date Matched Pair Plate Construction: Black Getter Construction: Top [] Dimple Foil Strip Country of Manufacture: USA Visible Date Codes: MO Lettering...PH0317$119.85