Preferred Series 6L6GC

24 Reviews
Best Seller

Availability: Usually ships within 24 hours.

USD $‎39.95
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

All our Preferred Series tubes are guaranteed for 6 months from the 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 6 months 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

24 reviews

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Rugged and very well built for chinese tube


I’ve try different brands of 6L6’s over the years and can tell you “This one is one of a kind“.Little more expensive than JJ’s but worthy .Hope they last with the time.The blue socket looks cool 😎 Thanks for the quick shipping

Super Tube, Super Customer Service!!!


These tubes really deliver! They went into my Jet City HDM 80's rock machine, and they do not disappoint!

I ordered a matched quartet, and when I discovered that one of them was allot hotter than the other 3, they were quick to send me out a better matched 6L6.

80's metalhead heaven :-D


I knew I wanted either TADs or Rubys for that huge 3D sound, so when I saw what the Preferred Series 6L6 was all about, I was very intrigued, to say the least!
Turns out that my gut feeling on these was well-founded, because they tonally benchmarked my SLO-modded Jet City HDM right up beside my friend's '04 Soldano SLO! (He was not pleased that he picked the wrong amp in a blindfold test)

Soldano-designed amps rely heavily on a superb PowerAmp section tone in order for the preamp section to do its magic. These tubes did not disappoint!

I will say that one of the tubes did exibit an issue, but these guys had a new one to me within a week to get me back up and running... no muss, no fuss.

Incredible 80's tones, superb craftsmanship and over-the-top customer service... this is the only place I get my tubes, and its where I send anyone who asks! Give these a try, you won't be disappointed

Not shy anymore!


I replaced a pair of 5881 sovtek wxt with these ps 6l6’s and my amp sound so clear and alive. I kept the 12ax7wa’s from sovtek that came with the amp to compare and it seems the spud is being projected out of the DeVille now, before it seems like the sound was muffled and suck inside, afraid to come out. Thx to the tube store tech for explaining the importance of matching and biasing my amp sounds amazing and to think it sounded good before, my celestions are performing effortlessly with these 6l6’s.

Solid Traditional Tone and Build


I haven't tried these in any other amps yet, but they sound wonderful in my PRS MT 15 guitar amp. This amp goes from super clean, to really heavy. Mid gain comes from my Way Huge Saucy Box pedal on the clean channel. All sounds clear and musical. Best description of the tube, it does nothing outrageous, but nothing bad either. Having all your amp knobs at 12 o'clock sounds like 12 o'clock. No boomy bass or crispy highs. Easy to dial in your personal sound. 3D and musical, I'm happy with these. A solid tube, with a no nonsense solid traditional tone.