Tube amp with 6N13S and 50Ohms Headphones schematic?

Dear Folks,

Looong time ago I developed some DI boxes and Guitar preamp stages with tubes. Mostly using nice russian NOS tubes, or brand new type from JJ.
Well, it´s winter and I need a new project beside fom hacking C-code and some "sand"-processors.
In my stock there are two nice 6N13S tubes, waiting to be used. 🙂
Any hints for a prooved schematic using this fine tubes to drive a standard 50Ohm Headphone ( Sennheiser HD558 )??

Best Regards
Karsten
Edit: Forgot that C in Cyrillic is an S 🙂
 
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