– 6922 (podstawowy model dla MK2 i MK3 oraz opcja „upgrade” dla MK1)
– 6DJ8 (podstawowy model dla MK1)
– 6ES8
– 6GM8
– 6N11 (podstawowy model dla MK1)
– 6N1P
– 6N23P
– 6N27P
– 7308
– 7DJ8
– 7ES8
– Cca
– CV10320
– CV2492
– CV5231
– CV5354
– CV5358
– E188CC
– E88CC
– ECC189
– ECC86
– ECC88
– M3624
– PCC189
– PCC88
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