Bock Audio 407 User`s manual - Studiocare Professional Audio
Contents
1. User s manual Bock Audio model 4 0 7 1 description 2 additional circuit notes 3 getting started 4 power supply and cable 4 safety warnings 5 specifications 1 The Bock Audio model 4 0 7 is a high quality cardioid directivity studio condenser microphone utilizing vacuum tube electronics Utilizing the U47 format originally built in the 1950 s this mic takes that platform and expands the electronics bandwidth It utilizes it s own proprietary cable and power supply The microphone s audio output is standard male XLR3 with positive excitation of the diaphragm at the front of the mic resulting in a positive voltage at the output XLR s pin 2 Audio output is fully transformer balanced 2 The Bock Audio 407 uses classic pentode run as single triode circuitry with no additional negative feedback and high quality through hole components Through hole components are more mechanically robust than surface mount and allow for worldwide ease of repair Single triode mic circuits demand excellent capsules before them and excellent transformers after them with a reward of low noise simplicity of troubleshooting and classic sound unachievable otherwise The Bock 407 departs from the classic U47 of the 1950 s in it s expansion of the bandwidth of the electronics which has had it s low frequency cutoff frequency decreased from 40Hz to 10Hz without any loss of high frequencies by use of a larger value grid resistor 3 It is recommended that the user2. place the mic in it s shockmount on a stand and connect all the cables before applying power to the unit Allow a few minutes for the mic to warm up 4 The Bock Audio IFET is powered by P48 phantom power 5 CAUTION Shock Hazard Do not open microphone when connected to power source No user serviceable parts inside Refer failed units to qualified service personnel VORTICHT Shock gefar Bitte nicht daf mikrofon offen wenn es eingeschaltet ist einen stoppkontakt Keine zu wartenden Teile im Inneren Beziehen gescheitert Einheiten qualifiziertem Service Personal ATTENCIONE Choc hazard N ouvrez pas le microphone quand il y a un connectionne avec un source d electricity Aucune pi ce r parable par l utilisateur R f rer unit s chou a un personnel qualifi ATTEZIONE Riscchio di scossa Non aprire il microfono quando e attacato al eletricita Non contiene parti riparabili Riferimento unit riusciti a personale qualificato www bockaudio com 818 506 1870 Specifications Patterns Frequency Range Sensitivity Equivalent Noise Distortion vs SPL 1kHz Impedance Recommended load Dynamic range maxSPL A noise S N 94dB noise Capsule size Tube type Dimensions Weight Shipping weight Power Supply www bockaudio com Cardioid 10Hz to 18kHz 2dB 26mv Pa 18dB A weighted 32dB unweighted 112dB 0 5 THD 118dB 1 THD 129dB 2 THD increasing distortion is non exponential nea
3. rly linear and primarily 2nd harmonic 200 Ohms true transformer balanced 2k Ohms 94dB 76dB A 62dB unweighted 1 diameter single backplate K47 type New Old Stock EF814k 2 dia x 8 5 oal 52x216mm llb 9 30z 1 58lbs 716g 13 Ibs N470 true linear factory wired 115v or 230v operation 818 506 1870
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