Made in St. Petersburg Russia.

 Cryogenically treated and a 24 hour burn in period. The benifits of the cyrogenic proccess last the entire lifetime of the tube. The benefits of the cryogenic valve is a significant improvement in dynamic response. Bass response is clearer with less microphonics. The cryogenic tubes sound smoother when over driven and have a bigger sound than the standard EL 34. The Winged C EL 34 has rich harmonic content and a tight bottom end. The high end sizzles when overdriven but doesnt sound brittle. A very articulate EL 34.

The listing is for a matched quad.

90 day warranty.