[Radioroslyn]

Well -21v is a little high should be about -8 to- 12 v or so.  Is there a cap between pin 3 of the 6Q7 and pin 5 of the 6F6? Did you replace the resistors in bias divider? Looks like they are 350 and 50 ohms off of the choke or FC. Can you see the heater glow in the 6Q7 and the 6F6? -21 shouldn't stop it from working at all. All of the other voltages look good. Could have a bad connection between the tube and it's socket. Touch pin 5 of the 6F6 should get hum.
Terry