Hi all, hoping for some advise, I have a 5F6-a circuit bassman build that is true to the original circuit except for I had it built with: 1. cathode/fixed bias switch 2. Bias pot 3. 2 x 8 ohm 10" speaker cab Great sounding amp as it is but for kicks I installed a 5Y3 with a set of NOS RCA 6v6's re-biased to 23 and really loved the sound even more as it did break up sooner I am just hoping to lower the power by using 6v6's. I am aware though that the OT that is in it with the 5881's is not correct for 6v6's. It has a Mercury Magnetics FTBP-59 power trans, ( a clone of the original)...and in speaking with MM I was told I could safely use a 5Y3 rectifier with this PT and then to match up with my 6v6's use a 8K primary OT. I would have to wire the 2x10's in series to get a 16 ohm load since the OT they offer with the 8K primary has only 8 or 16 taps. Their part number for this OT is FO50BM-8/16. So my question is does all this sound correct and will I be causing any reliability issues, I am aware that the 450v I have on the plates of those 6v6's is a bit high, any thoughts would be appreciated, thx.