i need the best formula for push pull output transformers

i need the best formula for push pull output transformers class ab1.
:roll: thanks

Best formula for what? Plate load, power output, secondary load? What are you trying to do?

Asked and answered before here and here.

You mention that English is not your language. Say what language you like best, and I am sure someone here can help.

prr you ever help me.thank for suport disturb you. :grin:

finaly i understanding!!!!!!! thanks!!! :grin: :grin:

i like this formula but i have a doubt. "subtract 50"...is minimun work voltage in load line grafic or it a simple part of formula??




For pentodes, working reasonably optimally (not super low or high voltage):

Find your power supply voltage V (not counting cathode-bias) and your output power P.

Subtract 50 from V.

Square it.

Multiply by 2.

Divide by P.

For 450V supply, 55 watts out:
450-50= 400; 400^2= 160,000; times 2 is 320,000, divided by 55 is 5,818. The 6L6 sheet gives 5,600 load for this condition.