They all need a refurb and are a royal PITA to work on. That said, they do a decent job for most alignments. The THD is a bit high, but it will still get the job done on all but TOTL tuners. I never use the meters or power functions, just the RF stuff, so having a bad transformer wouldn't be much of an issue. The output pad is a bit weird and unobtainable, but can be subbed with a low value pot, 75 or 100 ohms, if bad. FWIW, I never wanted to open mine again, so replaced almost every cap with carefully derated tantalums. There are also a few big electrolytics that should be replaced. There's a silkscreen error on the power supply board and maybe elsewhere, depending on vintage. Lots of info and discussion over at antiqueradios.com in the test equipment section. Do you have any probes or cables? Not hard to make if you don't.