This military spec Chatham 5R4WGA rectifier tube has black plates, bottom getters, and a rugged ceramic base. The print on the base or glass has the Chatham logo and reads "JAN-CAHG-5R4WGA Made in USA" (partial). Tube tests as new.
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This 1960s GE 5R4GB rectifier tube has black plates and side D getters. The white print on the glass has the GE logo. Tube tests as new.
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The 1960s GE 5R4GB rectifier tubes in this precisely matched pair have black plates and side D getters. The white print on the glass has the GE logo and matching date codes (LK). Both tubes test as new.
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This 1960s military spec Raytheon 5R4WGB rectifier tube has black plates, dual bottom getters, and a rugged ceramic base. The black print on the base has the Raytheon logo (partial) and reads "Made in USA."
Tube tests as new.
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This late 1950s RCA 5R4GY rectifier tube has an ST bottle, smooth black plates, and a bottom D getter. Its brown base has the RCA logo in black print. Tube tests as new with balanced diode sections.
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This RCA 5Y4GA rectifier tube has ribbed black plate, and a top getter. Tube tests as new and ships in its original box.
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This 1950s GE 5V4G rectifier tube has an ST bottle, black plates, and a bottom D getter. The silver print on the base has the GE logo. The bottle may be tilted (common for this tube type). Tube tests as new.
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This 1960s GE 5V4GA rectifier tube has gray plates and a side getter. The white print on the glass or base has the GE logo. Tube tests as new.
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This 1957 RCA 5V4G rectifier tube has an ST bottle, black plates, and a bottom D getter. The silver print on the base has the RCA logo. Tube tests as new and ships in its original box.
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This 1950s Sylvania 5V4G rectifier tube has black plates and a bottom getter. The green print on the base has the Sylvania lightning logo. Tube tests as new.
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This 1960s Sylvania 5V4GA rectifier tube has black plates and a top getter. The green print on the base has the Sylvania logo. Tube tests as new.
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This 1960s military spec Mullard CV2748 / GZ30 rectifier is a 5Z4 equivalent. This indirectly-heated rectifier should be considered an upgrade for a 5Y3 tube in most circuits. The Blackburn, UK factory code is etched in the glass. Tube tests as new.
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The 1960s military spec Mullard CV2748 / GZ30 rectifier tubes in this precisely matched pair are 5Z4 equivalents. These indirectly-heated rectifiers should be considered an upgrade for 5Y3 tubes in most circuits. Both tubes test as new.
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