6SL7GT-JJ TESLA 6SL7GT-JJ TESLA Click on image(s) above to view larger
Select Test Options
  • Factory Tested
  • Balanced (Triodes)

All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.

The JJ factory was born out of the ashes of the former Tesla factory. They currently make a range of High quality valves based on some of Tesla most famous designs.
JJ 6SL7GT follows the American design of the 1950s and as this valve is used in many vintage guitar applications they have cleverly made some excellent improvements to the valves design.

JJ have used a thick glass envelope with a solidly constructed anode plate. These plates are supported with a metal claspe which is supported by connecting the top and bottom to the mica. This results in the valve being very resilient to microphonics and vibration. This made it one of the best valves to use in your vintage Ampeg B15.

JJ have also managed to produce an audio sound that rivals the best sounding vintage 6SL7GT valves.

It maintains a superb linear response and clear and musical sound characteristics.
The other main improvement is the clear and defined bass response which has resulted in a beautiful sounding audio valve.

I have personally found these to be excellent in my own Ampeg B15 and can say that these JJ offer a sound that does rival the NOS RCA

We offer two options:

1) Factory tested
2) Balanced -matched triode sections for Phase splitter & Audio appications

All Balanced preamp valves are Dynamically Drive tested under real working condition and are matched on dB gain. They also have passed the following tests:

Gain (db) Drive Tested
Transconductance (gm) Drive Tested
Output Drive Tested
Noise 1 (signal to noise)
Noise 2 (Aural)
Microphonics Test 1(Ambient)
Microphonic Test 2 (Shock)
Cathode Test
Grid Leakage Test



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