Winged "C" 6H13C / 6AS7G Power Vacuum Tube

15 Reviews

Availability: Usually ships within 24 hours.

USD $ā€Ž59.95

Production of the SED Winged ā€œCā€ tubes has come to an end. We have purchased as much stock as available from them that was not factory seconds. We were offered factory seconds at a lower cost however we declined. We do know these factory seconds have entered the marketplace.

Stock is limited and our price has been raised to reflect the higher purchase cost of this final product. SED Winged "C" vacuum tubes should now be considered NOS (New Old Stock).

The 6AS7G vacuum tube is best known for being the tube used in Atma-Sphere OTL Tube amplifiers. The Music Amplifier MA-3 uses 42 6AS7 tubes per channel!

The 6AS7-G power tube is also a nice choice for many OTL headphone amps such as the Woo Audio 2, 3, and 22 models, and Darkvoice 336SE amps.

View the 6H13C tube data sheet.

Other SED Winged "C" tubes        6AS7 Tube Types

Additional Information and Downloads

Winged "C" 6H13C / 6AS7G 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

15 reviews

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Winged "C" 6H13C / 6AS7G | An Excellent Match for the xDuoo TA-66 OTL Amplifier!

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I just, "invested," in one of xDuoo's new TA-66 OTL single-ended headphone amplifiers with point-to-point internal wiring and decided to take a gamble on one of these SED-6AS7G tubes (because if Atma-Sphere puts these into a $160,000 amp, it must be pretty decent, right?) and HOLY COW I can absolutely confirm that this tube is an amazing match for the amplifier (driving a pair of Sennheiser x Drop HD 6XX cans). Feeding it from a 1-bit ladder DAC (Cayin RU7), this is the most analog sounding headphone setup I've ever experienced! Totally worth it! I have it paired with a Voskhod Rocket 6N2P-EV in the preamp stage that I also purchased here at The Tube Store.

Winged "C" 6H13C / 6AS7G | Yes yes YES!!!

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I had never heard of a "Winged C" 6H13C / 6AS7G tube before but had read more than one positive review of them. I just recently acquired a secondhand Darkvoice 336se and had a bunch of tubes to sort thru. After realizing that I probably should just dump them and get good replacements, I ordered this SED-6AS7G tube. for real. This tube alone made the biggest difference in the sound. The signal coming out of my DAC and being pushed into a set of Focal Elexs was simply stunning. The bass extension, mid and treble sweetness, and the soundstage was just simply amazing. It took another week for the preamp tube I ordered to come in, but I was already sold on just how bloody good this sounded. I am honestly thinking I would like to by a few extras to have on hold. I am wondering how long they would last based on several hours of daily use. If you are reading this and are in doubt, just put that behind you and get one (or more) Winged "C" 6H13C. They are simply fantastic.

Winged "C" 6H13C / 6AS7G | Wow....simply amazing tube.

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Wow. I must say this SED-6AS7G tube was totally worth it for sure. The sonic texture it created surpasses anything that I have heard from the amp. (A Darkvoice 336se) Gave the soundstage an additional complexity that I was not expecting. A great matchup for sure. Maybe I might by a spare or 2 to have them on hand.


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I love good tube amplification and I ordered this tube just to "try" it as I have other NOS RCA 6AS7G tubes on hand already. This tube, however, just blew me away! I mean seriously! I am trying out a new headphone amp and was going to return it as it was still within it's "return window". Then I received this tube from The Tube Store and put it in this amp I was in the process of evaluating. Even straight out of the box, I could hear there was something "special" going on with the sound! This particular tube is transformative and blows my other 6AS7G tubes out of the water! I've never heard such a change from one tube before and I've barely got 5 hours of listening on it! On top of this, the Customer Service I received from Haydn was beyond reproach. He went way over and above what I would have expected from a vendor in helping me out and he has firmly cemented me as a loyal The Tube Store customer. I'll be buying more from here with a smile!

Winged "C" 6H13C / 6AS7G | Very Nice!

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Sounds great in the Woo Audio WA3. The stock tube (a GE JAN 6080WC) became microphonic and this Winged "C" 6H13C was a suitable replacement.