Preferred Series 6L6GC

27 Reviews
Out of Stock
USD $‎59.95
This Preferred Series 6L6GC tube is a recent addition to our premium line of high quality tubes, where we find the best of current production and sourced to our specifications.

This 6L6 tube is a new version of the popular TAD 6L6GC-STR you might already know. Once exclusive only to TAD (Tube Amp Doctor) we contracted the Shuguang factory in China to produce a massive lot of these tubes to our specs. We think this is a better tube and at a better price.

The Preferred Series 6L6GC construction features:
- A black plate like the premium NOS RCA 6L6GC tubes from the 1960's
- Double halo-style getters
- Gold grid wires
- The filament used is low-noise
- The bottle is made with a heavy gauge glass
- And finally the blue color base is a nice touch too!

This 6L6 tube is versatile and will sound great in many amplifiers, for many styles of music. Anything from blues to jazz to metal. It is well balanced from top to bottom. The highs are smooth, clear and clean. The low end well detailed and articulate even when pushed hard.  We think this is the best alternative to the famous Philips/Sylvania STR-387 6L6GC.

From our review: "This tube has a sound that I would characterize as smooth and warm. The high end is articulate but not sharp or brittle. Bass response is bigger than most but not boomy, so you still get good note definition. The midrange is very nice and thick without any tendency to sound nasal."

The Preferred Series 6L6GC tubes carry a 6 month extended warranty.

6L6 Tube Types       Other Preferred Series tubes

Additional Information and Downloads

Tube Matching Information:
Power Tube Matching FAQ
Perfect Pair System

Warranty Information and Return Policy

Warranty Period: 6 months

Preferred Series tubes have a 6 month warranty from date of purchase. (Any exceptions will be noted on that tube's Warranty tab)

If you receive a tube that does not perform to the manufacturer's specifications, please do the following:

- contact us to get a return authorization
- return it via regular mail within 180 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.

Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.

We can not accept returns that don't have an authorization, are past 6 months, or are returned improperly.

These guidelines may be updated without notice.

Ratings & Reviews

27 reviews

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Tone Monster!


The Preferred Series 6L6GC power tubes literally transformed my Bassman into a tone monster. Great transaction, great individuals, fantastic service.

Great tube in fender twin and vibrosonic reverb


I'm a steel player out of Houston TX so i need a lot of power, punch, and headroom so I chose this tube for my amp. We all know about the Winged "C" power tube and the harmonic sustain they are famous for. These are by far, besides the new Tungsol 7581A tubes, the best new production power tubed I've tried. Amazing new tube. Love the tone, it's all there folks.

Great tube


In my secondary system I use Musical Paradise MP 301 MK3 integrated amp. Since the unit is self-biasing I took the opportunity to roll some power tubes. All of them came from Tube Store. Do I have to mention that the service is first class? We all know that.
This is the first time when I have tried PREFERRED SERIES valves and I will not hesitate to do it again in the future. Really good sounding 6L6 from top to very bottom. Nothing to complain about. Reasonably priced with extended warranty.

It's in the details


These tubes got the goods. Everything you want in a good 6l6gc. Detailed highs, punchy lows and sweet mids. The Preferred Series tube is balanced with great harmonics. Reminds me of the Winged C's I had in my Bassman a couple of years ago.

Tube is as reviewed and then some.


The tubestore's review is a good starting point. What it did not tell you is how responsive these tubes are to your tone controls. I put these in my Pro Tube Concert Reverb. They replaced a set of USA made 6L6GC " GE" Groove Tubes. It was like I pressured cleaned the amp.