Amp Rectifier Voltage Drop


Voltage drop during rectification typically occurs due to the product of both transformer and rectifier internal resistance. The following table provides average voltage drops for common tube and diode rectifiers during rectification.


Rectifier Voltage Drop(VDC)
5Y3GT 60
5R4G/GY/GYA 67
5R4GYB 63
5V4 25
GZ37 37
5U4GB 50
5U4GA 44
GZ34 / 5AR4 10
EZ81 20
Diodes 1.4


Amp Voltages



PLEASE NOTE: A valve amp contains lethal voltages when switched on and off. Measurement of voltages should only be carried out by a qualified technician.


5F1 Voltages

Voltages will differ based on the components being used. The following voltages are for reference and are based on a 5F1 champ build with 325VAC secondary HT voltage from the power transformer. Access a 5F1 schematic with voltages applied here.



TUBE/PIN 1 2 3 4 5 6 7 8 9
12AX7 169 1.4 170 1.3
6V6GT 358 318 20
TRANS B1: 367V B2: 318V B3: 272V


5E3 Deluxe Voltages

Voltages will differ based on the components being used. The following voltages are for reference and are based on a 5E3 Deluxe build with 325VAC secondary HT voltage from the power transformer. Access a 5E3 schematic with voltages applied here.


TUBE/PIN 1 2 3 4 5 6 7 8 9
12AY7 126 1.79 128 1.79
12AX7 150 1.21 186 45
6V6GT 353 324 22
6V6GT 353 324 22
TRANS B1: 358V B2: 325V B3: 238V


18 Watt Lite IIB Voltages

Voltages will differ based on the components being used. The following voltages are for reference and are based on a 18 Watt Lite IIB build with 290VAC secondary HT voltage from the power transformer.



TUBE/PIN 1 2 3 4 5 6 7 8 9
12AX7 145 1.1 145 1.1
12AX7 208 68 70 208 68 70
EL84 12 350
EL84 12 350
TRANS B1: 355V B2: 335V B3: 280V