Replacing my tubes in my 64 BF Fender Vibro Champ. Current tubes are: 2 GT 12AX7s 1 Slyvania 6V6GT 1 RCA 5Y3GT I'm thinking about going with: 2 Telefunkens for the 12 AX7s 6V6GT ???? Not sure. 5Y3GT ???? Not Sure. The amp is in great shape with a new Weber 8 Sig Alnico Speaker. I'm moving it back into my music room from my 12 year old son's room because I picked up a Fender Blues Junior for him. What would you recommend for the Tubes in this amp ? Thanks in advance.