Find Reviews and Compare Prices for:       All ProductsGuitar Amplifiers     4.0 (1)   Add a review THD BiValve-30 30W Class A Amplifier Head   THD BiValve30 bring all players of every style of music the absolute best in tonal diversity.With the ability to change out every tube in the signal path to suit your liking, the BiValve30 is so versatile, every passionate guitarist needs one of ... Have a question? Just Ask! Member Reviews Compare Prices Product Spec Send to a friend Category Tube Amp Heads Acoustic Amp HeadsAcoustic Combo AmpsAmp CabinetsAmp StacksAmp StandsAttenuatorsCombo AmpsFootswitchesGuitar PreampsHybrid Amp HeadsHybrid Combo AmpsMini & Headphone AmpsPA SystemsPower AmpsReplacement TubesSolid State Amp HeadsSolid State Combo AmpsSpeakersTube Amp HeadsTube Combo Amps--------Suggest a new option Brand THD ADAAERAmpegAMT ElectronicsAvatarB-52BehringerBlackheartBlackstarBognerBuddaBugeraCarvinCelestionC TechCrateDanelectroDean MarkleyDiezelDigidesignEgnaterElectro-HarmonixEnglEpiphoneEVHFenderGenz BenzGretsch GuitarsHiwattHot AmpsHughes & KettnerIbanezISP TechnologiesJet City AmplificationJJKochKrankKustomLaneyLABOGALine 6LopolineMackieMarshallMesa BoogieMoogMotion SoundOn-StageOrangePeaveyPignosePiranaRandallRiveraRocktronRolandSabineSoldanoSovtekSWRTC ElectronicTech 21THDTraynorUltraSoundVHTVoxWavesWood ViolinsYamaha--------Suggest a new option Something wrong in this page? Let us know! Related products: More Tube Amp Heads Guitar Amplifiers Other Guitar Amplifiers internal use: spec82 spec420 spec571