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Gainlab GLA-MP1 Bishop All Tube Channel

Channel strip with all-tube preamp section, full balanced signal path, and dual slope optical compressor


Product Description

The Gainlab GLA-MP1 Bishop All Tube Channel unit gives you everything you would expect from a regular high-quality channel strip, and more! The heart of the unit based on the mic preamp consisting of three vacuum tubes. There are inputs for the mic and instrument on the front while selectable mic and line inputs are located on the back panel. Along with phase, polarity and phantom power switches there is a special drive pot which can be used for coloring the instrument input. A large stepped gain selector knob is separated in two selectable scales for the ultimate flexibility with up to +60 dB gain.

The preamp section uses three valves with a stepped gain control with two selectable scales offering up to 60 dB of gain. Microphone, line-level, and instrument inputs with the addition of a Drive control for instruments which uses a discrete circuit to apply some color to the signal. Phantom power can be engaged by a front panel switch. There are additional switches for pad and polarity functions.

The optical compressor section employs Gainlab's "double slope" design. The 2nd Slope parameter placed next to the unit’s Threshold control provides increased versatility when compared to other LA-2A-inspired designs. A pair of gain reduction meters indicate the amount of compression being applied by each section of the compressor.

The Character selector switch allows you to toggle between Hard, Medium, and Soft settings. Five fixed release times along with an Auto function are provided by a Timing control. An 80 or 120 Hz selectabl high-pass filter can be engaged. The Dynamic Air Band switch promises to deliver a unique character to a signal’s high-frequency content.

In terms of performance, the Bishop has a frequency response of 20 Hz to 20 kHz (±1 dB) and THD+N <0.3% (measured at 0 dBu). The unit comes in a 2U rack-mount chassis weighing in a 11.4 lb.


  • Tracking
  • Recording
  • Sound Design
  • Saturator


  • All tube preamp section
  • Full balanced signal path
  • Dual Slope Optical Compressor
  • Mic, Instrument and Line input
  • HPF at 120 Hz, 80 Hz
  • 48V phantom power
  • Phase switch – Pad switch
  • Instrument drive
  • Dual ring stepped gain selector
  • Low gain mode +40 dB
  • High gain mode +60 dB
  • Output VU meter
  • Character selector
  • Timing selector
  • Threshold control
  • Dynamic Air band
  • 2nd slope control
  • Dual GR LED bar

Product Specifications

Condition New
Tube or Solid State Tube
Channels Single-Channel
Chassis 19-inch Rack-mount
Rack Spaces 2U
Direct Input Yes
Input Connectors Analog XLR, XLR Combo Jack TRS
Output Connectors Analog XLR
Compression Type Optical
Tube Complement 12AX7, E88CC

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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.
The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
James P.
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From the minute I placed my order I was kept well-informed through each step in your process. Even though I was buying a comparatively modest piece of gear, your attention to detail made me feel like I was purchasing a six-figure mixing desk.
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