I now agree as on my pc´s TFT screen the picture i posted looks much much better than on my tablet´s screen (and the light at home is only 2700 Kelvin !!!!).
SOME GOOD NEWS ABOUT TUBES FROM SHIKADA SAN!
I wrote to Shikada san today about the possibility of using DF96 tubes in place of DF91's, this is his response..
"The DF96 is a little big μ factor and half the power of the heater. However, the bias voltage is no problem at 4.5V, and there is a possibility that you can use no problem."
So it looks like we have another choice now! Let the hunt begin!
This is great news. i was looking for an socket adaptor for the df96 for weeks now because there was a geman language article that the df96 could be adopted to be used instead of a df91 !!!