Years ago I and a friend made a massive buy of SED Winged C GH13C tubes, since we were planning on buying the biggest Atma-Sphere monoblocks.
In the end although we love Ralph's stuff, our systems moved in a different direction.
I held onto them because I knew we would eventually get to this point, where these are now harder to get, and NOS pricing is rising.
These are $30 each on other websites, with volume discounts down to 28.
I've got hundreds of these. If you're an atma-sphere owner, you know exactly what an opportunity this is. This is your chance to re-tube, AND put your NEXT re-tube away at the best price these will ever be sold at going forward.
They come in boxes and even with their tube charts.
From another tube site (PS mine aren't factory seconds, either ;) ):
We’re fairly certain 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.
Paypal accepted but buyer must cover fees. If you are unsure of
how to do that then contact me. International shipping is estimated. If the
amount is less I will refund the difference.