The Balanced ECC83S is located farthest from the input jack in V5 and the ECC803S is located in V1.Combo amps are very hard on tubes because of vibrations which can cause tube rattle with any brand of tube. If you play by yourself in a quiet environment or record with your amp you may want to consider using the EuroDamper tube damper rings for the two power tubes. These are available under the "Related Products” tab as a pair.