feedback resistor RFB (kΩ) 
 more
RK (ohms) 
RT (kΩ) 
RP (kΩ) 
LTP voltage gain 
power tube voltage gain 
Power amp type  Class A   Class B
plate-to-plate primary impedance (kΩ) 
transformer feedback tap (Ω) 
closed-loop gain as a percentage of forward gain