Amplifier vacuum tubes for guitar amps, hi-fi amplifiers and vintage audio gear. This collection brings together the preamp, power and rectifier tubes used in tube amplifiers, from guitar amp staples like the 12AX7, EL34, 6L6 and EL84 to hi-fi types like the KT88, 6SN7 and 2A3. Many types are available as matched pairs and quads.

Tested, used and NOS tubes

Used tubes are tested before they ship. New old stock (NOS) tubes are unused original stock and are not always tested, so check each listing for the tube's condition before you order.

Preamp tubes

Preamp tubes are small dual triodes that set gain and shape tone in the first stages of an amp. The 12AX7 (ECC83) is the most common guitar amp preamp tube. The 12AT7 (ECC81) often drives reverb circuits and phase inverters, while the 12AU7 (ECC82) and 5751 give lower gain and more headroom. Hi-fi preamps and headphone amps often use the 6SN7, 6SL7 or 6DJ8.

Power tubes

Power tubes, also called output tubes, drive the speaker through the output transformer. The EL34 is tied to British-voiced amps, the 6L6 and 5881 to American-voiced amps, and the EL84 and 6V6 to lower-wattage amps. The KT88, 2A3 and 7591 show up in many hi-fi amplifiers.

Rectifier tubes

Rectifier tubes convert AC to DC in the amp's power supply. The 5AR4 (GZ34), 5U4 and 5Y3 are the usual choices. Use the rectifier your amp's tube chart or schematic calls for, since types differ in voltage drop and current rating.

Matched pairs and quads

Push-pull output stages run two or four power tubes, and a matched set helps them share the load evenly. Many of our power and preamp tubes are offered as matched pairs and matched quads. Check the options on each listing.

Which tube do I need?

Replace a tube with the same designation printed on the tube or listed in your amp's manual. Fixed-bias amps should have the bias checked after new power tubes go in. If you're not sure how, have a qualified technician do it.

Looking for radio or TV tubes? Browse our full vacuum tube collection or shop guitar amplifier parts. Need help finding the right tube? Email sales@bigriverhardware.com.