Try this....
Rfb will be used for your feedback. Cx across it will be a picofarad value under 1000p (depending on size of Rfb) and it's chosen for the best 1KHz square wave on an oscilloscope.
Rdiv is part of the feedback divider. I'd start with 1K. If you're getting crazy high values for Rfb, make Rdiv lower. If you're getting too low of a value for Rfb, make Rdiv higher. (choose Cx AFTER you settle on the resistors for adequate NFB. For 6L6 in pentode and HiFi, you'll be looking at 20dB+ or so of NFB)
Choke was in the wrong place for HiFi amps as well.... did you get this circuit from a guitar amp?
*edit*
Better make that 0,1uF cap on the feedback line 1uF (250V polypropolyne film), just so the gain doesn't skyrocket at LF
Cheers!