5AN8
Medium Mu Triode + Sharp Cut-Off Pentode
Base: 9-Pin miniature
 Data Sheet

Tube Manufacturer Condition Date Code Shape Test
539C 		Minimum
539C
5AN8 RCA NIB        

5AS4, 5AS4A

Twin Diode
Base: Octal
Full-Wave Rectifier
Alias: 5U4GB
Data Sheet

Tube Manufacturer Condition Date Code Shape Test
539C 		Minimum
539C
5AS4A RCA NIB     >80 54
5AS4A RCA NIB     >80 54
5AS4A RCA NIB     >80 54
5AS4A RCA NIB     >80 54

5C50
Unknown
Base:

Tube Manufacturer Condition Date Code Shape Test
539C 		Minimum
539C
5C50            

5R4, 5R4GA, 5R4GYA

Twin diode, full-wave rectifier
Base: Octal
Data Sheet

Tube Manufacturer Condition Date Code Shape Test
539C 		Minimum
539C
5R4GA Brimar USED        
5R4GA RCA NIB        
5R4GA RCA USED        
5R4GYA            

5U4, 5U4GB
Twin diode, full-wave rectifier
Base: Octal
Data Sheet

Tube Manufacturer Condition Date Code Shape Test
539C 		Minimum
539C
5U4           54
5U4GB Westinghouse NIB       54
5U4GB Westinghouse NIB       54

5V4, 5V4G, 5V4GA
Twin diode, full-wave rectifier
Base: Octal
Data Sheet

Tube Manufacturer Condition Date Code Shape Test
539C 		Minimum
539C
5V4G GE USED   ST >90 54
5V4GA Sylvania NIB     >80 54
5V4GA Sylvania NIB     >80 54 
ST = "Coke bottle" shaped

5Y3, 5Y3G, 5Y3GT
Twin diode, full-wave rectifier
Base: Octal
Data Sheet

Tube Manufacturer Condition Date Code Shape Test
539C 		Minimum
539C
5Y3 Slyvania NIB 74/80 54
5Y3 RCA NIB 54
5Y3 Tungsol NIB 54
5Y3G Super Silvertone USED ST 74/78 54
5Y3GT Tungsol NIB 54
5Y3GT GE NIB 54
5Y3GT GE USED 54 
ST = "Coke bottle" shaped

5Y4, 5Y4GT
Twin diode, full-wave rectifier
Base: Octal
Data Sheet

Tube Manufacturer Condition Date Code Shape Test
539C 		Minimum
539C
5Y4
5Y4GT Westinghouse Used

5Z4
Twin diode, full-wave rectifier
Base: Octal
Alias: VT74
Data Sheet

Tube Manufacturer Condition Date Code Shape Test
539C 		Minimum
539C
5Z4 RCA NIB
5Z4 RCA NIB
5Z4 RCA NIB
5Z4 RCA NIB
5Z4 RCA NIB
5Z4 RCA NIB
5Z4 RCA NIB