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Mods for the Trion 8000

  • Advanced Audio MicrophonesAdvanced Audio Microphones
    Dave Thomas replaces the 6J1/6J1B tube with a 6072a, and optionally replaces the stock transformer (a BV11 emulation) with a larger BV8 model. Coupled with circuitry changes, these changes yield 6dB more headroom and higher SPL. The stock capsule can be swapped for a dual-diaphragm Peluso model such as the CEK-367. By user request, Dave can tune the capsule bias voltage for HF response and sensitivity. The modded mic can sound “very close to a Neumann M49.”

OmnidirectionalCardioidBidirectionalCAD Audio Trion 8000

Multi-Pattern Tube Condenser Microphone

The Trion 8000 is a large-diaphragm tube condenser microphone with 3-way pattern switch. The circuit uses a pentode tube and an output transformer.

A switch on the body (not on the power supply, as in some tube condensers) allows selection of omni, cardioid, or figure-of-8 pickup patterns.

Trion 8000 Capsule and CircuitThe dual-diaphragm capsule is a 35.1mm (O.D.) K67 type, with dual backplates. The diaphragm diameter is 28.6mm. Based on what we know of the factory that manufactures this capsule, we would assume that the membrane material is 6 microns thick. The capsule is suspended via three plastic/rubber U-shaped brackets that attach via screws to the backplate of the capsule. These brackets do not attach to the microphone chassis, and can therefore move around if the microphone is jostled.

There is no low cut or pad feature on this microphone.

Trion 8000 PCBThe circuit is a Class A design, with relatively high self-noise of 21dBA. The output is transformer-coupled.

Our internal lab test of the mic reveals that the circuit is essentially linear; it drops off gradually below 1kHz to -1dB @ 25Hz, but otherwise flat to 20kHz.

ProAudio Review

The impedance converter in the 8000 uses a type 6J1 tube … the only data sheet I could find for it is entirely in Chinese. It’s a pentode with similar operating characteristics to the 6AU6, a more common tube used in this sort of microphone. The 6AU6 can indeed be used with a minor wiring change at the tube socket… CAD tests and selects the 6J1 used in the Trion 8000, and they are gearing up to supply tested replacements.


It uses a 6J1 tube. This is a pentode tube and you can switch it with the following equivalents. A 6AK5 may be called a EF95 or a 5654 tube… Mullard, GE and Philips make these equivalents.

The dual gold-sputtered diaphragms measure over an inch in diameter. The actual size of the capsule has been reported at 1.12'' (28mm) by StudioAuditions, 1.2'' (30mm) by PAR, and at 1.25'' (32mm) by Front End Audio and by mic modder Dave Thomas.

The ultimate strength of this mic is its peerless use as a lead vocal mic, capturing detail with stunning realism.

Ships in a metal case with spider shockmount and 115V/230V switchable power supply. CAD provides a 2 year warranty.

Weighs 2lbs, 13.5oz with shockmount — this is a heavy microphone.

Warren Dent

In omni position the Trion8000 on vocals is an absolute force to be reckoned with. It opens up the sound a bit more, the upper mids are more detailed sounding…really nice!

Resolution, 2007

Moving on to acoustic guitar was a little unwieldy… although not in sE Gemini territory, [the Trion 8000] is still a sizeable chunk of hardware. At about 12 inches away there was plenty of bass extension, good high-frequency detail and much more in the way of harmonic definition in the low and high mids [than with the Trion 6000].

The 8000 is a thoroughly versatile performer with plenty of character on its own; it should give the competition a good run for the money.

Electronic Musician, 2008

The Trion 8000 is a multipurpose microphone that sounds quite good on vocals and a variety of instruments. It can handle high SPLs without flinching… [it] delivers ample versatility at a good price, and its three polar patterns only enhance its flexibility and value.

The CAD Audio Trion 8000 is also known as: Trion8000, 8000.

The mic was released in 2006.


Frequency Response - OmnidirectionalClick Graph to Compare!
Trion 8000 Omnidirectional Frequency Response Chart
Frequency Response - CardioidClick Graph to Compare!
Trion 8000 Cardioid Frequency Response Chart
Frequency Response - BidirectionalClick Graph to Compare!
Trion 8000 Bidirectional Frequency Response Chart
Pickup Patterns Pads & Filters
Omnidirectional (14 mV/Pa; 20 - 20,000 Hz)
Cardioid (14 mV/Pa; 20 - 20,000 Hz)
Bidirectional (14 mV/Pa; 20 - 20,000 Hz)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 28.6mm
Capsule diameter: 35.1mm
n/a Max SPL: 143 dB
Self-noise: 21.0 dB(A)
Weight Length Max Diameter Interface(s)
830g (29.28oz) 233mm (9.17'') 65mm (2.56'')
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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