GE 12AY7 2-Hole Gray Plates Top "D" Getter Microphone Tube - Tests NOS on AT1000
Platinum Matched on Amplitrex AT1000. Amplitrex AT1000 Test Results 90%+ GM = Within NOS Specs 90%+ EM = Within NOS Specs. GE 12AY7 Double Triode Tube (Single). These fine tubes mostly made by GE or RCA are skyrocketing in price.