Hi all! I was searching the web concerning this topic and there are a lot of opinions on this as well as sometimes contradicting suggestions. Here is my question: I built a Parallel SE 2x6V6 amp inspired by various threads, articles and the "Truth about vintage amps" podcast. I took the Angela Super SE amp schematic as a starting point but did my own tweaks to the preamp as well as a variable NFB and spring reverb. Luckily it turned out great and it sounds really nice. Now here's the thing: I use a Hammond 125DSE (10W) transformer with an 8 Ohm speaker. The OT gives me a choice of 2.5k, 5k, or 10k for the secondary. Since I used seperate cathode resistors (tweaked to give me just under 95% of max. dissipation) for the power tubes I have the option of using it either with one 6V6 or two 6V6s in parallel. The Angela article suggests 2.5-3k OT primary for 2x6v6. That seems low to me, especially for higher plate voltages. (With my last 6V6 PP amp I used 6.6k like a Dleuxe Reverb uses.) In Merlins article about SE output stages (http://www.valvewizard.co.uk/se.html) he gives the following equation for the right plate impedance value when center biasing biasing: Z = Va^2 / Pa My plate voltages are 373V for PSE and 398V for SE. If I take 12W as maximum dissipation for 6V6s I get (398*398)/12=13.2k for one 6V6 (373*373)/12/2=5,79k for two 6v6s That would suggest that the 10k and 5k tap would be the appropriate match for my little amp. Any objections? Or input? Thanks!