JimL11
1000+ Head-Fier
You got me curious, so I took a look. I think you're right this is the CCS mod. (I've attached a pic so if I'm wrong please do correct me.) Sorry for the confusion.
Yes, that is clearly the CCS mod. If you compare your picture with the stock internals in my previous post, you can see where the 8 plate resistors in the stock amp have been removed, to be replaced by four CC loads.
The good thing about that is it more than doubles the effective power of the 6CG7/6FQ7 tubes compared to the stock amp, giving it the same amount of voltage swing as the Stax solid state amps (the stock 006 amp, it is rated at 340VRMS vs 450VRMS for the solid state amps). It is still a bit less current drive than the solid state amps, but enough to effectively drive the SR007, as you have found.