Atma-Sphere S-30 MK.3.3 Amazing

Atma-Sphere S-30 MK. 3.3
Purchased new directly from Ralph at Atma-Sphere
Purchased May 2014 as MK. 3.2
Updated by Atma-Sphere to MK. 3.3 in 2015 (new 3 year warranty)
The 3.3 revision is audibly lower distortion- they are smoother, more open and transparent.
Two years left on a transferable warranty
Configured with the recommended V-Cap Teflon ($600) and power supply ($400) upgrades
3 HiFi-Tuning Supreme fuses ($240)
Classic brushed anodized silver meter panel
This S-30 has only been used with Tonian Labs 12.1 S Classic (16 Ohm) speakers
Tubes
- 10 Svetlana 6AS7G Vintage Svetlana "Winged C" 6AS7G / 6H13C - St Petersburg
1980's (Purchased NOS from TC Tubes) ($370)
- 6 Sylvania 6SN7 GTB 1963 (Purchased NOS from TC Tubes) ($210)
- Extra 6AS7G Sino that came stock with the S-30
Atma-Sphere manual
Atma-Sphere original box and foam packing

This 1980s Svetlana 6H13C dual triode power tube is a Russian 6AS7G tube type popular in OTL and headphone amplifiers. It was made in St Petersburg before the Svetlana logo was purchased by New Sensor. It has black plates and dual bottom getters with lots of flashing. The gold print on the base has the Svetlana logo with the "winged C" emblem.