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Summit Audio TD-100 1-channel Active Tube Instrument Direct Box

Name: Summit Audio TD-100 1-channel Active Tube Instrument Direct Box
Brand: Summit Audio
Rating: 5 (6 reviews)

Vacuum Tube Direct Box and Instrument Preamplifier

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Item ID: TD100

Summit Audio TD-100 1-channel Active Tube Instrument Direct Box

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While this isn't an item we normally stock, we can still get it to you as fast as possible due to our great relationship with Summit Audio. Go ahead and place your order and we'll follow up shortly to let you know when to expect it. Estimated May 2026.

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Summit Audio TD-100 1-channel Active Tube Instrument Direct Box

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Outstanding DI performance on stage and in the studio

Rich sound. Awesome clarity. Incredible performance. The TD-100 Tube Direct Box and Instrument Preamplifier is in a league of its own. With the TD-100 in your set up, you have an excellent sounding input stage for digital recording, adding personality and quality to the signal before the converters. It's also excellent for live applications. No other DI gives you the wealth of features that you get with the TD-100. Summit Audio's TD-100's input section is driven by a 12AX7A/ECC83 vacuum tube, with the output section driven by a discrete transistor circuit utilizing plus or minus 24V rails. Use the loading control to match the input impedance with the output of your bass, guitar, or keyboard. Boost the output gain to get tons of drive and get the most out of the warm tube signal. If you're looking for great sound from what many consider the ultimate professional DI, you've found it with the TD-100!

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Tech Specs

Type: Tube DI
Channels: 1
Polarity Switch: Yes
Ground Lift: Yes
Inputs: 1 x Instrument
Outputs: 1 x XLR, 1 x TRS line out, 1 x 1/4" direct out, 1 x TRS headphone
Power Source: Standard IEC power supply
Height: 1.75"
Depth: 8.5"
Width: 8.5"
Weight: 5 lbs.
Manufacturer Part Number: TD-100

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Reviews

4.9

Customer Photos & Videos

I'm a keyboard player and producer and I never had tube DI boxes.
So I bought in 2004 two TD-100s for my synths. The sales person was Kenny Bergle from Sweetwater!
After 20 years of use, I'm still getting excellent sonic results from both TD-100s and from my digital & analog synths! The tubes and the capacitors inside both units are still ok(!) after recent measurements from a certified electronic technician.
I use the TD-100s also when I'm sampling sounds, which I deliberately distort them through the TD-100s so I can get a harsh & gritty sound. Τhen, I convert those sounds down to 12-bit or record them directly as 12 bit and I have a fantastic sound samples for hip-hop, house and Techno tracks. Warmth, transparency and reliability for 20 years non stop!
If you haven't decide what DI to buy, I strongly recommend the TD-100! You will not regret it!

Let me start by saying tis is a high quality studio piece of gear that is also versatile. I bought this for a bass amp right. after trying customer cables, DIs, reapers and even a splitter / balancer and other devices to match the level and impedance between the amp's (Aguilar DB751) unbalanced SEND to a balanced IN on a particular compressor (a WA76, like a 1176). The TD-100 was the only device that worked and delivered extremely high end audio quality. This (I believe) is due to its particular high-end preamp section, and adjustable impedance.

From the TD-100, the signal was optimized for the balanced, 600-ohm Input on the WA-76. After the compressor I'm able to use the amp's Return for parallel processing (mixing dry and compressed signal). I'm now using this rack in the studio and on stage. Note: the path has the amp Send to the TD-100, then it's balanced Out to a Summit TLA-50 balanced In, than then to the WA76- Finally back to the amp's return in parallel. It's an awesome stage setup that offers some of the finest studio-level audio quality anywhere.

More: In the studio. I'll use the TD-100's front panel Instrument IN, or go through the console. BY THE WAY, The TLA-50 has a gorgeous amplifier section, even in bypass, so together the half-rack TD-100 and TLA-50 is one gorgeous combo for guitars and bass in a single rack.

My long-time Sweetwater sales engineer (Jim) deserves credit for helping me to design this system.

I love this box. The sounds that I get with my jazz bass hit that sweet spot and sit just right in the mix. I have recorded bass, guitar and vintage analog synths with this DI and it warms everything up just right. My recordings sound rich and with warm clean tubey goodness for days. It's a bargain and you won't regret it.

This box is great! I use it to record my slim phatty, and it definitely thickens up the sound in a subtle but warm and pleasant way. If you drive up the gain you can actually get some grittiness into the signal, which I like sometimes. I would highly recommend this to somenoe looking to fatten up a monosynth.

I had to chose to buy the Avalon U5 DI box or either the Summit TD 100 and when i called sweetwater my sales rep convinced me to buy this......this DI box gives such a great clean signal and I am very happy with it...I recomend anyone needing a DI box to get this one

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What Do Our In-house Gear Experts Think?

Austin Moss

My favorite recommendation for fattening up keyboards, samplers, and synths, to say nothing of acoustic instruments like basses and guitars. Use the impedance control as a tone shaper. It's a direct box all right, direct to the sound you were looking for!

See also: Direct Input Boxes, Summit Audio, Summit Audio Direct Boxes