Winged "C" 6H13C / 6AS7G

12 Reviews

Availability: Usually ships within 24 hours.

USD $‎49.95
SED Factory Closure

Production of the SED Winged “C” 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" tubes should now be considered NOS (New Old Stock).

The 6AS7G 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 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

12 reviews

  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

Perfect for the Bottlehead Crack to increase warmth and reduce harsh treble

by -

I was looking for a way to tone down the treble in my Bottlehead Crack Amp with Speedball upgrade when playing through my HD650 headphones. So I did a little research and heard about this tube and a JAN Philips ECG 5814A preamp tube that claimed to reduce treble harshness and possibly increase the low frequencies. After some tube rolling, I didn't like the combo with the 5814A preamp tube, But WOW the Winged C 6H13C did exactly what was claimed when combined with the stock preamp 12AU7 tube. My OTL works exactly as it should now with this tube. If you want to reduce the harsh high frequencies of your Bottlehead Crack OTL Amp don't hesitate, just buy it. I'm going to get a spare on my next order.

Great Upgrade.

by -

Purchased this as an upgrade to the stock tube for my Darkvoice 336 OTL headphone amp. Upon hearing this tube I noticed an immediate increase in sound quality. All the fog from the stock 6AS7 tube, which I had not noticed, disappeared. I noticed the soundstage has very slightly shrunk from the stock Chinese tube, but separation and detail have shot up. Casts your sound against a very clear canvas. A worthwhile upgrade.

This SED Winged “C” should fly to your mailbox

by -

The SED Winged “C” 6H13C / 6AS7G replaced the stock tube in my Darkvoice 336se. I paired it with a Shuguang Natural Sound CV-181T. I think this combination will simply blow your mind. It will transform your beloved headphone amp into one that sings like Pavarotti. The tubes beautiful shape and appearance will compliment the other as well. Jon provided me with stellar customer service so I would get to enjoy my purchase even sooner.



I used it to replace the stock 6AS7 of the darkvoice 336se, which has horrible noise and would even produce interferences when I move my mouse. This tube solved the issue. Top tier

A great Darkvoice upgrade

by -

Replaced the stock tube in my Darkvoice, very happy with the results over the stock tube. Zero issues from the jump and after 40 plus hrs this thing has impressed me greatly for the price.