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Summit Audio 2BA-221 Mic Preamp  From Summit

Award Winning Low Budget Variable Impedance Tube Microphone Preamplifier

Summit Audio


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What We Think

A spectacualr little value in a low-budget variable impedance tube mic preamp. Allowing for variable impedance control of microphone inputs allows this preamp to match perfectly with a wide variety of microphones ranging from condenser mics to ribbon mics and dynamic mics. And, not only does it allow for some tube saturation on the main output, but allows for a second clean output which bypasses the tubes. For all of these reasons, the 2BA-221 really is a good value, and probably the reason that EQ magazine just recognized it with their award for excellence.

Summit Audio 2BA 221 Mic and Line Preamplifier

Summit Audio shows you the ins and outs of their 2BA 221 Preamp!

  • Signal Chain
    • Summit Audio 2BA-221 Mic Preamp

Manufacturer's Description from Summit

Introducing the extraordinary 2BA-221 continuously variable impedance microphone preamp from Summit Audio. Featuring microphone level, line level, and Hi-Z instrument inputs, the 2BA-221 utilizes separate and individually controlled solid state input controls to mix the microphone input with the Hi-Z or line input into the variable vacuum tube output. Mix them together through the 12AX7A/ECC83 vacuum tube output or separately through individual solid state outputs. The 2BA-221 also features a stackable input design; multiple 2BA-221's can be linked together to form a modular mixing device with individual outs, inserts per channel, and a final vacuum tube gain stage. Its swept high pass filter, multiple simultaneous tube and solid state outputs, insert jack, and internal power supply makes the 2BA-221 a powerful tracking and mixing tool.


Full-plate voltage matters

The proper amount of voltage to a tube and solid-state circuit can make all the difference in the quality of the sound. The 2BA-221 is made with the highest quality full-voltage tube and solid-state signal paths and the best components available. The 2BA-221 even has a separate, dedicated power source for its 48V phantom power, and does not draw current away from the main circuits.


Let signal flow

Integrating the 2BA-221 into your studio or live rig is easy given the comprehensive selection of input and output options provided. We designed the connections of the 2BA-221 with creative options in mind.


Variable tube output control

Another really cool feature is its variable tube output control, which provides access to a huge variety of tones, from clean solid state to rich harmonics and all sorts of variations in between. What a benefit to have one preamp and still have the advantages of many different sounds! The 2BA-221’s single 12AX7A Tube provides rich, warm tone and is easy to find and replace.

Really well built

The Summit Audio design philosophy considers the entire package when it comes to crafting gear. We pay special attention to the details of construction and have included many refinements over the years so units are durable enough to handle the rigors of the road. That is one of the reasons why you will find Summit gear on tour with many of today’s top touring acts around the world.


Hand-crafted in the USA

Each piece of Summit gear is meticulously crafted by hand in our shop using only the best quality components and attention to detail. Quality components and engineering know-how are the critical element to the sound and longevity of audio gear.

Summit Audio

About Manufacturer

Hello and thank you for choosing Summit Audio! We have a long history of manufacturing the highest quality audio processing equipment on the planet. From microphone preamps and compressors, to digitally controlled equalizers with software control, depend on Summit Audio for the highest quality and best sounding audio equipment for your professional recording studio, post production facility, broadcast studio, or performance audio venue. All Summit Audio products are manufactured in the United States at our Northern California based headquarters and undergo strict and vigorous testing. Every piece is individually hand crafted to the highest standards using Audio Precision testing equipment.


Size and Weight

Height: 1.75 inches (4.44 cm)
Width: 8.5 inches (21.59 cm)
Depth: 7.42 inches (21.59 cm)
Weight: 7 pounds (3.15 kg)

Power Configuration

Internal AC Supply
20 watts, 115, 50 or 60 Hz (USA model)
Fuse size .5 amp, slo-blo for 100/115 V
Fuse size .25 amp, slo-blo at 230 V

Input Impedendance

Mic: 1.5K ohms
Hi-Z: 10K-1.75M ohms
Output impedance (XLR): 150 ohms


Mic Input: +4 dB female XLR
Line Input: -10 dB 1/4" balanced
Outputs: +4 dB male XLR and 1/4" -10 dB balanced
Stacking Input/Output: -10 dB balanced

Max input level

Mic: -16dBu
Line: 22dBu
Hi-Z: 15dBu

Operating Measurements

Max output level (XLR): 25dBu
Max gain: 75dB
Equivalent input noise: -135dB average 10Hz-20kHz
Frequency response: 10Hz- 50kHz (-1dB)
Signal to noise ratio: 115dB average 10Hz- 20kHz
THD + Noise: 0.055%, -32dB in +4dB out, 1 kHz
Vacuum tubes: 12AX7A



3 year limited warranty.