Gee I wonder what in the world it could be? 
Someone on this forum (sorry I can't remember their user name at the moment) explained in detail how to make a dummy load with a capacitor so you can just attach it by itself to the speaker binding posts on your amp. Also there are system break in CDs that I imagine might possibly work for that, and cable "cookers," which is what I'm currently using, and is a convenient, simple, and effective method of burning in capacitors. I've had a pair of .1mf Russian Teflon capacitors on my Hagtech "Frybaby" for nearly two months. The forum member I mentioned above says Teflon caps take a lot longer to burn in, and about two and half to three weeks is fine. I've only left mine like that for so long because I don't currently need them, nor do I currently need to use the Frybaby for anything else at the moment, and I figure it can't hurt.

Someone on this forum (sorry I can't remember their user name at the moment) explained in detail how to make a dummy load with a capacitor so you can just attach it by itself to the speaker binding posts on your amp. Also there are system break in CDs that I imagine might possibly work for that, and cable "cookers," which is what I'm currently using, and is a convenient, simple, and effective method of burning in capacitors. I've had a pair of .1mf Russian Teflon capacitors on my Hagtech "Frybaby" for nearly two months. The forum member I mentioned above says Teflon caps take a lot longer to burn in, and about two and half to three weeks is fine. I've only left mine like that for so long because I don't currently need them, nor do I currently need to use the Frybaby for anything else at the moment, and I figure it can't hurt.