I put this one in my AC15C1 and it sounds great. Plenty of decay. I keep it at 50% on the dial most of the time.
I highly recommend JJs tubes from eurotubes . They and the reverb will make the amp sing!
I got a used AC15 a few months ago and the reverb was acting weird. $24ish on Amazon for a replacement.
Mod Reverb Tank, 8EB2C1B Equivalent https://www.amazon.com/dp/B003BGXW50/ref=cm_sw_r_cp_apa_i_gsCaDbC6AC5KZ