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.


5E1 Voltages

Voltages will differ based on the components being used. The following voltages are for reference and are based on a 5E1 champ build with 300VAC secondary HT voltage from the power transformer.



TUBE/PIN 1 2 3 4 5 6 7 8 9
12AX7 150 1.5 150 1.5
6V6GT 300 300 19
TRANS B1: 320V B2: 305V B3: 260V


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


Vibro Champ Voltages

Voltages will differ based on the components being used. The following voltages are for reference and are based on a Vibro champ build with 315VAC secondary HT voltage from the power transformer.



TUBE/PIN 1 2 3 4 5 6 7 8 9
12AX7 205 1.6 200 1.5
12AX7 170 1.6 340 175
6V6GT 342 340 21
TRANS B1: 355V B2: 340V B3: 320V




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


5F11 Vibrolux Voltages

Voltages will differ based on the components being used. The following voltages are for reference and are based on a 5F11 Vibrolux build with 300VAC secondary HT voltage from the power transformer.


TUBE/PIN 1 2 3 4 5 6 7 8 9
12AX7 155 1.5 160 1.3
12AX7 160 1.3 205 50
6V6GT 337 330
6V6GT 337 330
TRANS B1: 340V B2: 330V B3: 260V
Bias set to about -31V


5F6 Bassman 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.


TUBE/PIN 1 2 3 4 5 6 7 8 9
12AY7 150 1.5 150 1.5
12AX7 150 1.2 150 1.2
12AX7 285 34 230 34
5881 428 428
5881
TRANS B1: 432V B2: 430V B3: 385V B3: 325V
Bias set to about -48V


Fender Princeton Reverb AA1164 Voltages

Voltages will differ based on the components being used. The following voltages are for reference and are based on a Fender Princeton Reverb build with 340VAC secondary HT voltage from the power transformer.

1st 12AX7: Pin 1 to 3 for Reverb, 6 to 8 for preamp. 2nd 12AX7: Pin 1 to 3 for tremolo, 6 to 8 for phase inverter.



TUBE/PIN 1 2 3 4 5 6 7 8 9
7025 160 1.3 160 1.3
12AT7 400 8 400 8
12AX7 160 1.2 160 1.2
12AX7 260 2.4 200 50
6V6 410 400
6V6 410 400
TRANS B1: 420V B2: 320V B3: 240V
Bias set to about -34V



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



JTM45 EL34 Voltages

Voltages will differ based on the components being used. The following voltages are for reference and are based on a 45 Watt JTM build with 345VAC secondary HT voltage from the power transformer.



TUBE/PIN 1 2 3 4 5 6 7 8 9
12AX7 200 1.5 200 1.5
12AX7 180 1.2 180
12AX7 250 34 235 34
EL34 435 433
EL34 435 433
TRANS B1: 440V B2: 435V B3: 350V B4: 300V
Bias set to about -35.9V