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Sterling Audio ST66 Large Diaphragm Tube Condenser Microphone 889406491069

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The Sterling Audio ST66 is a tube condenser microphone that employs a large capsule with an ultra-thin 3-micron evaporated gold Mylar diaphragm. Optimized to capture the most definition and detail fro... Click To Read More About This Product

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The Sterling Audio ST66 is a tube condenser microphone that employs a large capsule with an ultra-thin 3-micron evaporated gold Mylar diaphragm. Optimized to capture the most definition and detail from all acoustic instruments like piano, drums, and guitars, the ST66 mic's low-noise GT6205M tube in a Class-A triode circuit provides warmth and detail, adding new dimension to vocal and especially instrument recording.

The ST66 uses triode wiring on specially selected pentode tubes to yield low noise and a more realistic dynamic response than their competitors. Its power supply is designed with a load-balancing circuitry that allows cable runs of more than 200 feet with no deviation from optimal performance.

Sterling Audio microphones employ several advanced technologies that separate their large-diaphragm condenser mics from the rest of the pack.

One of the more important advancements is their Disk Resonator system. With it, Sterling Audio is uniquely able to compensate for the 14kHz frequency roll-off that is inherent in large diaphragm mics. As any good audio engineer knows, this deficiency translates to a lack of sparkle from high-frequency sound sources.

Other manufacturers have typically solved this problem by cutting other frequencies and then increasing the entire signal to help even out the frequency range. Unfortunately, this results in increased noise.

Disk Resonator Technology incorporates a brass umbrella that protrudes from the center of the diaphragm in Sterling Audio's ST66 microphone. It gently boosts the diaphragm sensitivity to shorter sound waves, allowing it to respond more accurately to those all-important higher frequencies. The result is optimal sensitivity, full frequency response, and a low signal-to-noise ratio.

Another piece of audio wizardry comes in the form of the ultra-thin diaphragm membrane made of Mylar. While most modern condenser diaphragms are 6 to 12 microns in thickness, Sterling Audio, in association with 3M, has produced a highly resilient Mylar that measures a mere 3 microns. This allows the ST66 to deliver an extraordinary degree of sensitivity.
Requires phantom power.


  • Low-noise GT6205M-USA tube
  • Disk Resonator design extends high-frequencies naturally
  • Large 1-1/4" all-brass capsule, hand assembled and oven baked for long term, stable operation
  • Low-noise mic cable with Neutrik connectors
  • Nickel-plated all brass body
  • Custom-wound nickel core output transformer
  • ST-SM4 shockmount
  • 7-pin XLR mic cable
  • PSM1 power supply and cord
  • Preamp: Tube-based, Class-A design
  • Polar Patterns: Fixed cardioid
  • High Pass Filter: Switchable 75Hz, 12dB/octave
  • Attenuation Pad: Switchable -10dB
  • Frequency Response: 20Hz ” 20kHz
  • Equivalent Noise: 23dB SPL ” A Weighted
  • Sensitivity: 35mV/Pa
  • Signal/Noise Ratio: 79dB A-Weighted
  • Maximum SPL: 130dB-140dB (adjustable w/pad)
  • Typical Load Impedance: >500 ohms
  • Output Source Impedance: 200 ohm transformer isolated
  • Dimensions: 7-1/2" long, 1-4/5" max. dia.
  • Weight: 1 lb.
Customer Reviews

Review Snapshot

by PowerReviews
Sterling AudioST66 Large Diaphragm Tube Condenser Microphone

(based on 5 reviews)

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Reviewed by 5 customers

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(42 of 43 customers found this review helpful)


Unbelievable definition and clarity!

By Darnstrat

from Terre Haute, IN

Comments about Sterling Audio ST66 Large Diaphragm Tube Condenser Microphone:

In recent years, the onslaught of Chinese made condenser microphones has at least given the home/project studio the 'look' if not the 'sound' of pro studios. Many of these imports are excellent values for the money but still aren't quite up to the standards required for professional recording. The Sterling Audio line of microphones changes all that. I purchased the ST66 with the intent of using it primarily as a vocal mic, wanting the traditional 'warmer' sound found in tube microphones. However, the first application I got to use it on was recording an acoustic guitar. Normally I would have used a small diaphragm condenser to capture the transients and give the guitar more bite on the picking. I was awestruck at the results of the ST66! The clarity, transparency, and the dynamic response resulted in one of the best recordings of guitar I've had in 30 years. I immediately tried it on a squareneck Dobro, and the results were just as stunning. Male vocals recorded using the mic were warm and silky smooth.. the proximity effect that cardioid mics are known for sometimes means that the low end blows out the overall sound.. not so with ST66. By using the high-pass filter, the resulting warmth is enhanced and lets the true character of a voice shine. The 3 micron diaphragm obviously results in a superior dynamic response. Coupled with the class-A tube amplifier and very low self-noise, the ST66 compares (and in my opinion) exceeds the quality of some well-known German mics that one would pay 4 or 5 times the cost of the Sterling Audio. Additionally, the mic features an -10db pad and a switchable high-pass filter. The mic is incredibly solid and well-built. The included shock mount is far superior than that found with most Chinese imports and the power supply is rugged and appears to be built to last. Overall, I cannot find any faults in this microphone other than I now want several more. Take the next step up in recording and try out the ST66. You won't be disappointed.

(33 of 36 customers found this review helpful)



By Wen

from Queens, NY

Comments about Sterling Audio ST66 Large Diaphragm Tube Condenser Microphone:

This mic took me by suprise, it will surpass any of your expectations, the tube gives it a nice warm sound, the -10 pads are great for Mc's with very loud voices, i have it connected with a Mbox Mini, and run it with Protools, and the quality is nothing less than perfect, it can be compared to mics that are 3 times the price, if you want Professional quality for a reasonable price, this is the mic to get

(22 of 22 customers found this review helpful)


You want quality, here it is.

By Gbluesy

from North Carolina

Comments about Sterling Audio ST66 Large Diaphragm Tube Condenser Microphone:

This is by FAR the best Mic investment I ever made. I have NOTHING to say about this mic in a negative way. It is the best sounding mic you can ask for. Do not let the price fool you, it more than worth it. A whisper or a yell produces the exact same effects and it will serve you 2X back in tone, quality and ambient satisfaction. I use it for recording only, never took it out of the studio, So live recordings may prove to be different. But for a studio, this is one of the best values I seen yet.

(3 of 3 customers found this review helpful)


Mic is fine but not the power supply

By Melissa Sekafetz

from Oregon

Comments about Sterling Audio ST66 Large Diaphragm Tube Condenser Microphone:

The mic seemed to work fine but I have had two power supplies and both are dead. New ones list for $99 so just be forewarn the quality is obviously not here.

(2 of 2 customers found this review helpful)


Good Vocal Mic

By Danielle Resende

from Carrollton, TX

Comments about Sterling Audio ST66 Large Diaphragm Tube Condenser Microphone:

I am male baritone country singer and bought this microphone solely for recording vocals. I first recorded using the preamp on the mackie mixer or on the steinberg audio interface. I couldn't seem to get the sound I was after. I felt the sound was kind of muddy and missed the subtleties of my voice. I actually preferred my sm57 using those same preamps. I then purchased a GAP Pre73 preamp and I have to say what a difference! The ST66 is now much better sounding with my voice making it sound more warm than muddy. I can hear the details in my voice a whole lot more. The sound of the sm57 improved also but it wasn't such a startling difference as the st66. I guess the bottom line is if you're going to buy this mic make sure you use a high quality preamp with it or you might be disappointed.

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