12AT7. Used for phase inverters in many amps such as Fender Black and Silver Face, reverb drivers, etc.

High current phase inverter or lower gain preamp tube.

A new offering from China, warm round and fat tone, not too bright

The new GT12AX7M is a reissue of the original Mullard 12AX7/ECC83 dual triode preamp tube

Older style Russian type, strong tone but a little edgy

The long plate Russian Version of the 12AX7 preamp tube

Great for Marshalls and Fenders. Sweet warm mid range tone, complements tone of European amps.

Also know as the 6072, was a popular tube in the late 40's and early 50's in most Fender and Gibson amps. Photo is of 12AU7 and will be updated in the near future.

A 12AX7/ECC83S/7025 replacement with about 70% of the gain of a 12AX7.

JAN spec microphone tube

Specially selected for use in the recording microphones as they exhibit low noise, hum and microphonics. These tubes are tested and processed from NOS General Electric USA made stocks and are the hand picked of the litter.

A single triode used in some earlier amplifiers.

(European, very linear, or true, tone...might be best bet for bass). The standard tube of Marshall and Vox amps.

Any of Groove Tubes selected and screened tubes can be specifically picked at matched for precise needs or requirements. This cost is per tube, in addition to the posted cost.

GT SPECIAL APPLICATIONS GROUP. Specially selected and matched 12AT7 for critical audio or guitar/bass amplifier use where a match of the two sides of the triode are desired for phase inverter or driver use.

GT SPECIAL APPLICATIONS GROUP. Specially selected and matched 12AX7 for critical audio or guitar/bass amplifier use where a match of the two sides of the triode are desired for phase inverter or driver use.

Fender High Gain kit. 2 selected high gain ECC83S tubes optimized for the preamp stage of Fender amplifiers of all eras which use a 12AX7/7025 first gain stage.Two high gain preamp tubes and one matched 12AT7 phase inverter.

Fender Soft-Touch kit. 3 Tubes; 2 selected lower gain, slow rise time 12AX7C tubes optimized for the preamp stage of Fender amplifiers. Also included is 1 matched 12AT7 phase inverter.

Marshall High Gain kit, 2 SAG ECC83S and 1 AX7-MPI tubes optimized for the preamp stage of Marshall style amps.  

Tone Triplier Kit. Change the tonal character of your amplifier in less than five minutes with this set of three preamp tubes. Each tube with a different tonal signature.

12AT7 Silver Series (tube prices are for single tube quanties) - For detailed description of this tube, please see the GT description of the GT labelled product.

12AU7 Silver Series (tube prices are for single tube quanties) - For detailed description of this tube, please see the GT description of the GT labelled product.

12AX7-C Silver Series (tube prices are for single tube quanties) - For detailed description of this tube, please see the GT description of the GT labelled product.

12AX7-R Silver Series (tube prices are for single tube quanties) - For detailed description of this tube, please see the GT description of the GT labelled product.

12AX7-R2 Silver Series (tube prices are for single tube quanties) - For detailed description of this tube, please see the GT description of the GT labelled product.

12AX7-R3 Silver Series (tube prices are for single tube quanties) - For detailed description of this tube, please see the GT description of the GT labelled product.

ECC83-S Silver Series (tube prices are for single tube quanties) - For detailed description of this tube, please see the GT description of the GT labelled product.