7f33ac1a_ecp_cc__Value_Notes
[Part] CCS1, CCS2 [Value/Notes] 
These are CRD's and set the current flowing through the tube and act as I/V converters. Somewhere between 1mA and 3mA is probably a good starting point, but feel free to experiment. The datasheet is unclear on operatig points for the tube, suggesting only 0.9mA at 6.3V on the plate. Since weare running with considerably higher voltage onthe plate, it is trial and error to find a good spot. However, it does suggest no more than 0.6W of dissipation from each plate. If that's too much of a limit, use a 6DJ8 instead. There is space for either the DO-35 or the TO-92 version. Also, you could use a resistor here. This will require a slightly higher B+ but might be a fun experiment. The suggested buffers can take +/-30V and the TLE2426 can take 40V (so they say) and you'll probably need to upspec the caps, but this will likely offer a tube-ier sound.
ecp.cc
Value/Notes