Chrissain, if you search the web, you'll find all the tube techies say:
"Changing the coupling caps to smaller values reduces bass, while changing to larger values adds more bass."
I recommend getting closer to the original value (2.7 uF). I understand you can't fit a large cap in the chassis which is why you went with 2.2, but this is probably causing your bass problem. You should have eight .47 M-cap Supremes laying around that you pulled out. Solder them in parallel with the 2.2 so your total value comes to 2.67. You don't have to buy anything to find out how it sounds. It might solve your problem.
If you want expert tube mod advice, contact Jim McShane. He's very well respected and a pleasure to work with.
Best of luck with your project!
"Changing the coupling caps to smaller values reduces bass, while changing to larger values adds more bass."
I recommend getting closer to the original value (2.7 uF). I understand you can't fit a large cap in the chassis which is why you went with 2.2, but this is probably causing your bass problem. You should have eight .47 M-cap Supremes laying around that you pulled out. Solder them in parallel with the 2.2 so your total value comes to 2.67. You don't have to buy anything to find out how it sounds. It might solve your problem.
If you want expert tube mod advice, contact Jim McShane. He's very well respected and a pleasure to work with.
Best of luck with your project!