Podwójna trioda 12AX7A / ECC83 . Lampa selekcjonowana przez firmę TAD. The TAD ECC83WB Selected was tested and selected for low noise and low microphony perfomrance. The Tube Amp Doctor ECC83-WB Selected has a balanced tone with a slight emphasis on the upper mids, which gives the sound a nice string attack and clarity, while maintaining a strong and defined bass range. With the extra kick in the upper mid-range, the TAD ECC83-WB PREMIUM Selected also does really well in vintage guitar amplifiers. If the TAD ECC83-WB PREMIUM Selected is used in hi-fi audio amplifiers, the tube adds a bit of freshness and presence to the signal.