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EAR 824 Tube Microphone Preamp

EAR 824M valve microphone preamplifier
MFR# 824-M

Product Description

The EAR 824 Mic Pre is a versatile device for use as an upgrade from standard mic amps or as a level booster and line driver for use with any microphone.

Power is available as either 48V phantom powering or as other optional configurations including 130V for the B&K line of mics.   With the optional EAR matching transformer ribbon microphones can also be accommodated.  Gain is switchable from 16dB to 60dB in 4 dB steps (2 dB steps available as an option) to cover all applications.

Onboard M/S decoding can be provided as a custom order.  Output is balanced via a wideband transformer with impedance suitable for driving long lengths of high-grade cable.

This amplifier enables the user to extract the maximum from any microphone with the minimum of signal degradation.  A fully thought out product rather than an afterthought as often provided by microphone manufacturers, it applies the same expertise in audio amplifiers as has made the EAR power amplifiers famous.


  • Input impedance: 600 ohms (standard phantom power version)
  • Output impedance: 650 ohm, balanced and floating
  • Maximum output level @ 1% distortion: +26dBm into 600 ohms
  • Microphone power: up to 7mA available per microphone

Product Specifications

Condition New
Tube or Solid State Tube
Channels Single-Channel
Chassis 19-inch Rack-mount
Rack Spaces 2u
Direct Input No
Digital I/O No

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I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.