In looking at the lead dress, following the output from the 47nF cap off of V1 pin 6, I see it's twisted with the power supply line that feeds the two preamp tubes. I'd unbundle that and maybe even use a shielded cable to get it to it's 220k resistor where it sums with the output off of V4 pin 6 (via it's cap and 220k resistor).
I can't make out the cap value on the bias pot, though it looks small. I know the 65 Super Reverb re-issue doesn't show a second bypass cap off of the bias pot, but I'd make that one at least 47uF/63V, or even 100uF/63V. The solder joints on the first ground (blk wire from the input jacks, I presume) together with the buss wire from the cathode resistors/bypass caps of the two tubes looks like it needs to be done better. Not to crazy about the soldering on the bias pot case, where the resistor, electrolytic cap and wire come together. Looks like a cold joint.
We haven't seen the back side of the front panel pot wiring yet.