11 Reviews
USD $‎39.95
Note: at this time we do not expect more stock. A close alternative is the Preferred Series 6L6GC.

The TAD 6L6GC-STR has a tight low end and has all the guts and bite to perfectly accomplish all the rocking sounds from SRV to modern NU-Metal. They have powerful deep bass and a clear, airy top end.

The TAD 6L6GC-STR has an black-plate design, gold grid wire, double getter construction, no-noise filaments, and a 1.2mm thick heavy duty glass envelope.

Other TAD tubes        6L6 Tube Types

Additional Information and Downloads

6L6 Tube Review

Tube Matching Information:
Power Tube Matching FAQ
Perfect Pair System

TAD 6L6GC-STR Datasheet (PDF)

Download Adobe Acrobat PDF reader

Warranty Information and Return Policy

Warranty Period: 3 months

All our tubes are guaranteed for 3 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 90 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 3 month, or are returned improperly.

These guidelines may be updated without notice.

Ratings & Reviews

11 reviews

My Wife Accused Me of Buying a New Amp


First point of business has to be the speed of delivery and careful packaging done by thetubestore, awesome.
To the heart of the matter, I purchased a matched set of the TAD 6L6WGC-STR and 3 Tung-Sol 12AX7 tubes to replace the Fender factory Groove Tubes in a Hot Rod Deluxe III. I also purchased a matched set of TAD 6V6GT-STR and a single Tung-Sol 12AX7 to replace the factory tubes in a Fender Super Champ X2.
Both amps came alive. The change in tone was very pronounced, clear and clean chords, well balanced single notes. Highs are musically bright, not brittle and the lows are tight and defined. Add a little dirt and the tubes break-up with a slow bluesy crunch.
The tone difference was enough that my wife accused me of buying a new amp.

High Expectations to Disappointmet


I have purchased multiple matched pairs of the tubes based on reviews and write-ups. This is the second set purchased where one of the two tubes develops a rattle after an hour of play time. I'm hoping to get a replacement matched set or a refund.

Perfect for jcm 900 6l6 100 watt!


I have an older Marshall JCM900 5881/6L6 and these are recommended under the "premium package" the tube store always seems to recommend winners in their suggested packages and man were they right with these! The JCM900 is one of the most underrated amps in Marshall history. The biggest problem in my opinion is the factory tube choice used by Marshall for these. Way too much brittle high end and everyone was turned off by the JCM900. After replacing the stock tubes with these TAD 6L6GC it put that bottom end and clarity back in with the most creamy organic tone you could wish for! The only alteration I made to the premium package they recommend was substituting the EH 12ax7's with JJ ECC83S/12AX7 tubes. The EH 12AX7 tubes were a little too grainy for me compared. My JCM900 now out tones vintage Marshall JCM800 and others I have compared it against and I can't tell you how many people ask me what's under the hood. TAD 6L6GC-STR tubes are awesome!

Worked great in my Soldano SLO


Power tubes can change your amps tone! Looking for something to take the harshness out of the mids and highs these did the trick. Can't comment on how reliable they are yet, haven't burnt these in.

Great Product!


During the tweaking process of my Vibroverb clone, an Orange Drop 0.1uf coupling cap connecting the output section shorted, this caused an output tube to red plate and immediately a resistor on the tube socket burnt, followed a fuse. After testing everything out, found and replaced the dead parts, the amp came back to life and it sounds amazingly well, I was surprised these tubes took the beatings so well!

They sound fat and warm when cranked up, and when paired with the JBL E130, the right OT and the right circuit. The tone reminds me of SRV all the time.

Some customers blame these tubes for not delivering the same tone as their old RCAs in their Fenders, it is because these are much closer in construction to the Sylvania STR387s.

I won't hesitate to buy another pair of these 6L6GCs.