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Old 8th March 2011, 07:51 AM   #1
Volpe42 is offline Volpe42  United States
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Default 32 Channel Microphone Preamp

A friend of mine as asked me to look into building him a Balanced Tube Microphone Preamp for his Digital Recording Studio (if I remember correctly he uses a DAC), and I am wondering how much of an undertaking this would be?
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Old 8th March 2011, 08:25 AM   #2
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There are quite a few mic preamp threads out there already, some are really informative, there will certainly be enough there to give you a good idea.

Antonio and Ruffrecords have been working on a 10 channel mixer for a while, and that seems like a big task.


32 channels would be a mammoth undertaking.

Broke solderer with delusions of grandeur
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Old 8th March 2011, 03:29 PM   #3
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Yes, a bit more information would be helpful. Is this just 32 individual mic pres or is there some mixing to do as well?

A 32 channel tube mixer would indeed be a challenge!


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Old 9th March 2011, 12:49 PM   #4
Volpe42 is offline Volpe42  United States
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My understanding is that he just wants the preamps.
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Old 9th March 2011, 01:12 PM   #5
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My understanding is that he just wants the preamps.
Don't you have any specification ?
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Old 9th March 2011, 02:01 PM   #6
kevinkr is offline kevinkr  United States
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Originally Posted by artosalo View Post
Don't you have any specification ?
Yeah you need that.. Here are some questions that I would ask, and I expect ruffrecords probably has many additional useful suggestions, but at a minimum I would ask:
  • Do you need (switchable) 48V phantom power?
  • Do you want input transformers, and if so what part of the budget can you allocate to their purchase?
  • What features are on the mixing board that you don't need to duplicate? (EQ, polarity inversion, etc?)
  • How much gain is required, and how do you want to control it?
  • What is the noise floor, typical and peak output levels of the microphones being used? (Gain requirement, noise floor and overload margins, any special supply or load impedance considerations?)
  • Do you need balanced output? (Since this is a tube pre, that probably means another transformer.)
  • Stick to commonly available tubes like the 12AX7, 12AT7 or go for something more exotic and hence expensive?
  • What sort of packaging/chassis format do you envision as being ideal? (4 ITU rack chassis with 8 independent channels sharing a supply for example or ?)
This sounds like a really, really big project to me..
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine

Last edited by kevinkr; 9th March 2011 at 02:04 PM.
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