I have a Yeti 100.  The first power transformer that came with the kit, worked for about a week and then
the HV (purple leads) secondary fried.  I got a replacement, that I paid for from, St. Nik.  I installed the
power transformer and started to test the outputs right after installation.  I measure the HV, fine, measured
the bias tap, fine, measured the 6v tap fine, measured the 5v tap fine, then as I am shutting of my DMM, I smell
that familiar electrical burning short smell and the main fuse blows as a wisp of smoke comes from the transformer lead outlets.  I checked the main 4 A fuse and sure enough it was blown.  After ohming out the entire system and disconnecting the secondary leads from all circuitry, I find that the 6V secondary is shorted internally in the PT.  I must say, that St. Nik really sells some junk power transformers.  He claims to have them wound specially for CT.  If it was me, I would change my source.  They are real junk.  As a matter of fact, most of the stuff, in his kits are either average, or cheap parts.  I am an EE and work for a DOD contractor building missle systems; so I do know a little about this subject.  If you really want to build one of St. Niks designs, then use
good parts from a USA source, like ClassicTone, or Mercury or Hammond.  All this guy does is copy someones designs, I have never seen anything original come from Ceriatone since it has existed.  Well  at least I gave them a chance; I was apprehensive about it, and now I know why.  Ceriatone = really expensive junk.