Bb-D1 Discrete Jfet Active Direct Box

208.00 excl. VAT

Bumblebee Bb-D1 is an active Direct Box with a Jfet input stage and a custom toroidal output transformer that we’ve designed particularly for this application.

J-Fet Input Stage

The J-Fet input stage pulls the best out of your bass or guitar and makes the instrument sparkle with most subtle touch due to very high (10 MOhms) input impedance that unloads pickups and provides the perfect signal transfer.

No Negative Feedback

The absence of negative feedback is a main feature of this DIY Active DI. Such approach results in desired coloration and preserves even the gentlest transients, which are so important for the vivid sound.

Toroidal Output Transformer

The Active DI Kit includes the custom output transformer. It adds that smooth silky feel to the sound and provides great balancing for long cable runs. Toroidal design makes the transformer immune to most types of interference.

Built-In Power Conditioning

The DI features a built-in power filter based on Zener voltage regulator, so it will preserve the clarity and remain nearly dead noiseless even when used with imperfect phantom power supplies.

The MusicTech Magazine have Rated The Bb-D1 DI as 9/10!

MusicTech Magazine have rated the Bumblebee D1 DI as 9/10

Jfet is The Key!

Bumblebee Bb-D1 is an active Direct Box with a Jfet input stage and a custom toroidal output transformer that we’ve designed particularly for this application. Jfets are know to be the most “tubey” sounding semiconductor elements with sonic coloration resembling the character of pentodes. Moreover, Jfets have very high input impedance, which is beneficial for passive guitars and basses due to detailed reproduction of the high frequency range, making the sound dynamic and lively. Toroidal transformers have many benefits as well, the most important of them being a very high natural immunity to EMI eliminating the need for extra screening and very low winding resistances minimizing the signal loss and thermal noise.

Bumblebee Bb-D1 Active DI with Transformer DIY Kit Open

Bb-D1 Active DI Operation Overview

Bumblebee Bb-D1 active Direct Box does not have a negative feedback, which is very beneficial for the sound quality, but the downside of such approach is the necessity to sort the Jfets in ranges by their Idss (maximum idle current) and to pair with different source resistor (Rs) values for each range. Not too good for mass production, but perfect for small series boutique company. As a result, you get the ultimate quality for a reasonable price.

The other important detail is the application of phantom power. It is not a secret that the quality of phantom power supplies in modern budget equipment is often questionable. Therefor, the direct box features a two-stage passive filter and an active voltage regulator made with three zener diodes, in order to make sure that only the perfectly clean current is powering up the device.

Technical Information

  • Input Impedance: 10 MOhms
  • Maximum Input Level: 1.25 Vrms (+4 dBu)
  • Output Impedance (Balanced Out): 50 Ohms
  • Output Impedance (Amp Out): 10 KOhms
  • Dimensions (L x W x H): 135 x 75 x 45 mm

Testimonials

I used this DI for my bass on a couple of gigs, and I can say: it sounds amazing. The sound is super detailed and fat. I have been using a lot of DI-boxes in the past and this one is definitely one of the very best, for a modest price.
Frederik Bastiaensen, Borgerhout, Belgium, www.marblesounds.com
I used my BB Active DI at church and WOW! We have been using a cheap passive DI and there wasn’t any definition to the bass, just low end rumble, I plugged this in and all of the issues with the bass tone through the system were gone, every note rang out clean and clear!
Rollie Hallen, Clarkston, United States
This is a very easy build for anyone with basic soldering skills. The end result is a very nice sounding DI that gives full sounding lows and clean vibrant highs, I use it on my piezo film pickups that have very high impedance with great results.
Bradley Gooderham, Tweed Heads, Australia
This DI box is amazing! It feels robust and the sound quality is excellent. I haven’t had the chance to really use it yet but having tested the device upon completion I couldn’t believe how good it sounded. As for the build I couldn’t have asked for a better introduction into the world of audio DIY. 
Justin Hendy, Swansea, United Kingdom

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