Just bought a matched pair of Amperex PQ 7316/ECC186 Holland Short Plate O-Getter 1965 Ct5 tubes that measure like new. Should be here by Saturday.
No, I did not look for the Mullards. I believe those short plate Amperex tubes are supposed to fall somewhere between the lusher Mullard long plates and box plates, and the more precise/detailed Telefunken and Siemens tubes. I did like the PQ 7308 version in other preamps I owned some years ago.