Rectifier Tube Voltage Drop Chart

This is a chart showing the specifications for 5 volt rectifier tubes that can be used in guitar amps. By having this information on a chart you can choose a rectifier tube that will best suit your playing style. The more of a voltage drop (DCV Drop) you have the more sag or compression you will have. The starting volatge is 425 volts from a diode rectifier and each tube’s specs drop from there. Also shown is the current available (DC mA) from the rectifier and the filament current draw (Fil Amps). It is important to pay attention to the filament current draw. Your power transformer may not have enough current supply on the 5 volt winding for the rectifier tube. All specifications were taken from the General Electric Essential Characteristcs book. Your actual voltages may vary.

Tube Type DC mA PIV FIL AMPS Max ACV DCV DCV DROP
Diode Rectifier 425
5AR4 / GZ-34 250 1500 1.9 450 415 10
5V4-GA 175 1400 2 375 400 25
GZ37 350 1000 2.8 450 388 37
5U4-GA 250 1550 3 450 381 44
5U4-G 225 1550 3 450 381 44
5U4-GB 275 1550 3 450 375 50
5Y3-G/GA 125 1400 2 350 365 60
5R4GYB 250 3100 2 900 362 63
5R4G/GY/GYA 250 3100 2 750 358 67