hi,
I build 3 ceriatone amps so far.
Started with the DC30 (not the most easy amp but not as difficult as the ots)
No mistakes.
Second, a 5E3 (simpler than the dc30 en OTS), no mistakes.
thirth, the OTS 50W, 2 mistakes,
1. wrong resistor in biasing (the 9V battery of my multimeter was to low, and I didn't see the flashing icon on it's display
)
2. wired the switches for PAB and OD on the back upsidedown.
My advice is, buy the kit you really want and work VERY SLOW. Check every connection ad least 3 times.
Don't rush. It takes me several days (weeks) to put an amp together.
There are good movies on ampbuilding on youtube.
There is a guy on this forum (or was it ampgarage.com?) that put a series of movies about ampbuilding on youtube. By watching them I learned a lot.
Read a lot on amp forums and ask questions. (and post pix of every step.)
and most important, work safe! there is high voltage in those amps!
Have fun!