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Hello Romy, I finished the 6e5p – 211 amp,  I  help the 6e5p with CCS  to drive the 211, the 6e5p is not a easy tube, it is very exigent. At the begin give me a lot headache, oscillating a lot and give me a horrible sound, later I put a 1k grid stopper ti G1 and the oscillating finished. Too I had to move many times the bias point, sorry for not read you before, the 6e5p fell better far of the -2v bias and is very audible the different, now I use a battery Ni MH as cathode bias with 3 AAA at 3,8v, after tested resistor-cap ( Silmic II)  and Led bias ( red, green and blue ) , one day I tested the diodes  1N4002  4 pcs in line to give 2,9v but too was horrible.  Now I use the battery as the winner.

Well I have two different lot of 6e5p and I have found a big sound differences:

Lot 1  Reflector  1973    the sound is no bad but far of gentle and close

Lot 2 Reflector  1967 OTK logo  more open, more air, more all. 

In your big experience about the 6e5p same recommendation about which year or factory need to buy.

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