if C2 means the coupling cap to the 300B, it should be 1K with CCS after this cap, like this:
Its more easy than the Mu stage, as you can see.
The 3K3 resistor after the CCs isn't really necessary, but it seems to prevent some oscillation, or whatsoever. It sounds a bit better with this.
have fun soldering,
and regards,
Juergen
