V1 is located physically closest to the input jack on the front panel. The remaining positions go in numerical order with V5 being physically farthest from the input jack.V1=ECC83S High GainV2=ECC83S High GainV3=ECC83S High GainV4=ECC83S StandardV5=ECC83S Balanced
V1 is located physically closest to the input jack on the front panel. The remaining positions go in numerical order with V5 being physically farthest from the input jack.V1=ECC83S High GainV2=ECC83S High GainV3=ECC83S High GainV4=ECC83S StandardV5=ECC83S Balanced