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opinions on tube rect. phantom vs diode bridge
Old 13th November 2009
  #1
Gear Head
 

opinions on tube rect. phantom vs diode bridge

I am designing a new tube mic preamp.(top Secret)

anyway who wants tube rectified phantom power and who thinks it should be a diode bridge.

it will be regulated and ramped.

Looking for your opinion. Be Nice.
Old 14th November 2009
  #2
Gear Head
 

no takers?
Old 14th November 2009
  #3
Lives for gear
 

Hi
If you plan to sell it or even if not, silicon rules really as the extra effort to use a valve rectifier with eventual unreliability and waste heat does not make much sense.
You would be better off dropping the HT from the main supply down to 48 as the phantom reqiuirement is so smal.
Matt S
Old 15th November 2009
  #4
Gear Maniac
 

Would a tube rectifier sag at preamp power draw levels or is there some other reason to to use a tube?
Old 15th November 2009
  #5
Lives for gear
 

Hi
You're the designer, you can work it out knowing the fluctuations in current draw and the impedance of the rectifier.
Matt S
Old 16th November 2009
  #6
Gear Maniac
 

Me? The OP is the designer; I just have a question for anybody who takes time to actually answer it.
Old 16th November 2009
  #7
Lives for gear
 

Hi
Basically no and if it did then the circuit would probably oscillate at low frequencies.
For a preamp the percentage change in current draw of the overall circuit is small unlike a power amp (excepting class A) where the amp at full drive will be many times the 'quiescent' level.
Matt S
Old 16th November 2009
  #8
Opinions? Sorry, until we see something, they are also top secret.

Jim Williams
Audio Upgrades
Old 17th November 2009
  #9
Gear Head
 

thank god matt's in the uk wow!

Once again i was only looking for some thoughts.
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