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Groove Tubes / ECC83/12AX7R-GROOVE TUBES SUPER PREMIUM
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All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.
All prices contained on this page are exclusive of VAT. This is currently charged at 20% and is payable by the UK only.
Groove tubes were founded back in 1979 by Aspen Pittman and have become
one of the most respected valve brands in the world.
We Offer The best tested Groove Tube valves in the world
We take selected GT items and in addition to GTs in house testing and distortion rating on output valves they also undergo our own unique real world burst testing. The burst testing process involves a series of varying timed electrical signal bursts. This runs the valves under the same stress conditions that they will meet in your amplifier. All output valves are then dual matched by us on current and gain. This will ensure that you get the best selected GT valves available anywhere in the world.
We believe this combination gives you the best tested valves available anywhere in the world.
The Groove Tube 12AX7R was the standard factory fitted valve in a large number of Fender amplifiers. It has also become the industry standard valve that is used by many other guitar amplifier manufacturesWe Offer The best tested Groove Tube valves in the world
We take selected GT items and in addition to GTs in house testing and distortion rating on output valves they also undergo our own unique real world burst testing. The burst testing process involves a series of varying timed electrical signal bursts. This runs the valves under the same stress conditions that they will meet in your amplifier. All output valves are then dual matched by us on current and gain. This will ensure that you get the best selected GT valves available anywhere in the world.
We believe this combination gives you the best tested valves available anywhere in the world.
There are a number of good reasons why this valve was fitted as standard by Fender.
Its clean sounds are very clear and detailed at the top .This provides clarity over all frequencies without a harshness at the higher end. Its super low microphonics and its solid and proven reliability
When the valve is run into distortion the valve produces a clear vintage style overdrive and handles boost signals from pedals extremely well with no fizziness.
It also has a very solid construction with rigid anode plates so is great in combo applications. It is also good all round replacement for modern high gain amps as it has low noise levels has a tight control on the overdriven sound.
Over the years we have had many batches of the GT 12AX7R and these valve have been
One of the most consistent valves we have stocked. Which is a real credit to Aspen and all the staff at GT.
In addition to GTs in house testing these Premium GT are specially Dynamically Drive tested under real working condition by us and checked for noise and microphoney.
All GT Premium valves 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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