Pcb for push pull amplifier with EL34, 6P3S, KT88 like final tubes and for input and phase spliter can be used ECC81, ECC82, ECC83, ECC88, 6N1P, 6N2P with necessaries modifications for filaments and other components These phase spliter is used in a lot of commercial hi-fi tube amplifiers can be used in combination with PSU board from herehttps://www.pcbway.com/project/shareproject/Power_supply_for_tube_amplifiers.html