VTA ST70 low gain board with high efficiency speakers

Hello,
I have a low gain (12au7) which I converted from a high gain 12at7 board a while back. I recently built some new speakers and they are MUCH more efficient than my last speakers. Sensitivity is about 105db. So, now I hear noise (sounds like tube rush).

Just to see a bit where it's coming from, I removed my 12au7 tubes and turned on the amp - very quiet! Nice.

So I guess my question is - how do I get the VTA 12au7 ST70 to be more quiet with these high efficiency speakers?

Gain is generally where the noise will come from on an amp with high sens speakers.

But you say you already did the low gain conversion, if you did ALL of it then there
isn't much left but use maybe 12bh7 or the jj ecc99 tubes, one to check is there is
a bypass cap on the voltage gain tubes cathode on the high gain board, sometimes
when people convert to the low gain board they didn't remove it, check to see that
you have and if not remove it then, you'll drop a bit more gain and may fix your issue.
(c9 and c10 I believe are the bypass caps on the voltage amps cathode)

Otherwise supply capacitance can help, I tend to run between 220-470uf after the choke.

Also feedback can help, raising the feedback(lowering the resistor value) to an extent can
lower the noise floor, I just wouldn't go to low there.

Wow, VERY fast responses! Thanks

I did remove C9 and C10, so that's not an issue. And I'm actually using some low noise Brimar CV5042 (12BH7 equivalents) already.

I will give the lower R7 and R8 values a shot. In fact, I'm already in process of ordering new resistors as it is, since I had tried to "upgrade" my board with a bunch of carbon film resistors, which are supposed to be "warm" sounding (Kiwame and Takman REX to be specific), but they turned noisy after about a year of use So, I'm going back metal film resistors right now.