Metropoulos Forum

Hi!
I have output transformer that has 6,6k primary impedance and i´am planning to puild JTM 45 amp. The question is should i use KT66 or EL34 tubes with this transformer?

Hi, u should use the KT66 ideally, tho people do use EL34's. If u plan on using EL34's u could mismatch the speaker load to the impedance selector, ie; use an 8 ohm speaker load with the selector set to 16 ohms, this way the EL34's would see a plate to plate load impedance of 3k3. Hope this helps. Cheers

Thanks for the information!
I will order pair of KT66:s.