I HAVE SEVERAL TUBES THAT CAN BE SUBSTITUTED FOR THE EXPENSIVE TYPE 6000 DRIVER TUBE IN THE T368 XMTR.ONE IS THE 6AV5GT, ALSO HAVE 3 25AV5GT WHICH REQUIRES ADDING SMALL FIL XFMR TO T368 TO SUPPLY THIS ONE TUBE. ALL NOS IN ORIGINAL BOX UNUSED. ALSO HAVE ONE NEW EIMAC 4-65A AND ONE GOOD USED ONE. ANY OFFERS? W7KPB.