What are all the reasons for under heating (impedance?)...... Im messing with 5840 tube in M49/Royer/AKG circuits in some schematics im using its under heated 5,7v others down to 4V .....
Also biasing I see the different schemes that exist but not shure how they effect the mic sound which is most important to me I read that the U47s sheme contributes to the U47 souind.....how & why...I have one of Maxes fantastic kits the Mk47 its sound great BUT to me not better than my messy thrown together point to point circuits with their different biasings ..... also my MK47 has more back ground hiss dont get me wrong its not bad highm impedance board is all clean & I have tried several tubes so I dont think there is anything wrong & did I read that the U47 circuit is noisier than most tube mics...... & can this be because of the biasing scheme ..... im thinking of disconnecting the cathode & using a 1.V AA battery, will that work.....
Thanks for reading
Also biasing I see the different schemes that exist but not shure how they effect the mic sound which is most important to me I read that the U47s sheme contributes to the U47 souind.....how & why...I have one of Maxes fantastic kits the Mk47 its sound great BUT to me not better than my messy thrown together point to point circuits with their different biasings ..... also my MK47 has more back ground hiss dont get me wrong its not bad highm impedance board is all clean & I have tried several tubes so I dont think there is anything wrong & did I read that the U47 circuit is noisier than most tube mics...... & can this be because of the biasing scheme ..... im thinking of disconnecting the cathode & using a 1.V AA battery, will that work.....
Thanks for reading