McIntosh c2200 phono tube question

I believe that my phono tubes are failing and wish to replace them but forgot which set of tubes are phono.

Anyone know which set of tubes are phono on the C2200 preamp? Front set (nearest faceplate)or back set?

The high level or line stage tubes are the four by the front of the C2200 and the phono are in the rear by the phono input.