While the "R" model is 10w more in Triode mode than the standard model, it appears your SF CD speakers are 88db/1w sensitivity (4ohms). You might not be getting replies as the std model is less rare than the higher power R model. Also, many have changed coupling caps in the Rocket 88 with some degree of success.
As for tubes, the Raytheon 12BZ7s are decent, not overly warm, and I’m wondering about two things for you.
1) Are they truly NOS tubes, like never broken in, need more time to settle in? Give them 30 days.
2) Do you have access to (8ohm) speakers above 90db sensitivity to try?
As for tubes, the Raytheon 12BZ7s are decent, not overly warm, and I’m wondering about two things for you.
1) Are they truly NOS tubes, like never broken in, need more time to settle in? Give them 30 days.
2) Do you have access to (8ohm) speakers above 90db sensitivity to try?