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LaChapell 500TDI 500 Series Tube Direct Box  From LaChapell

Tube direct box with dual input options

LaChapell Audio

Manufacturer's Description from LaChapell


- Single 500 series bay

- TrueTube™ properly powered tube

- High Pass Filter

- Tube drive knob and output level knob




The Dual Drive knobs on LaChapell's preamps provide an infinite array of tonal options. Favoring the input knob increases the signal going to the tube, resulting in more harmonics and overall distortion. Favoring the output knob yields a very clean signal. Together, you can dial in sounds from pristine to warm and harmonically rich.



The front panel 1/4″ jacks provide even more versatility. The bottom jack is a through output, but can ALSO be used as a lower impedance input, each jack offering a slightly different quality.



TrueTube™ technology supplies both the plate and filament of the tube with the proper voltages they need to access the full characteristics of the tube. Other 500 series modules cannot supply the needed 250V and don’t have the headroom or harmonics that characterize that classic tube sound.



A built-in high pass filter inserted after the first gain stage has a -3dB point 65Hz at MAX gain shifting semi- proportionally with the TUBE-DRIVE gain.



Everything in the 583S mic pre is designed to be best in class. Every component, transformer, wire and tube has been meticulously selected for performance and longevity.


LaChapell Audio warmth and clarity for bass and other instrument pickups.

Another first of its kind, the LaChapell 500TDI is a 500 series tube direct box (tube DI) that ranges from pristine clean to loads of character. It can be focused and articulate with crisp distinguished notes, or meaty with growl and harmonic overtones. Using the tube-drive and level knobs, dial in the perfect tone for your bass or other instrument.

The 500TDI Tube DI features LaChapell Audio’s TrueTube™ technology which provides proper operating voltage to the 12DW7 tube. Most tube modules for the 500 series use a starved plate design which does not give the tube the full voltage it needs to get the tube sound recognized as “classic.” A Cinemag transformer adds weight and warmth to the output.

The front panel of the 500TDI tube direct box has two inputs. The top input is a high impedance input while the bottom input can be used as a through or a lower impedance input for more tonal variety.

LaChapell Audio

About Manufacturer

With the 992 you have the option of choosing between two unique input topology configurations. Standard 992: Featuring a transformer-less balanced differential input utilizing two USA made 6072A's per channel along with twin matched 400v caps. This configuration provides >50dB of gain (usually about 52db) with a typical non-weighted EIN of -114 to -116dB. Extended Gain 992: By replacing the input caps with the Jensen JT-115k transformer and exchanging the 6072's for the timeless 12AX7/ECC83 this variant is able to provide a generous >74dB of raw internal gain with a typical EIN of -124 to -126dB referencing 150ohm. The direct instrument input (Hi-Z) on both variants utilizes a high performance Jensen direct transformer which feeds the balanced differential amplifier input. In operation, the user has individual control over the input and output gain stages of each channel. This provides uncommon flexibility to delve into the 992?fs broad sonic pallet making it one of the most versatile preamplifiers in any environment. Push the inputs hard and capture that elusive air that can only come from fully balanced tube gain. Or, pull the inputs back and favor the output stage for a cleaner, more linear signal - the choice is yours. Output signal strength is easily monitored through an isolated Sifam back-lit VU meter. There are also five illuminated toggle switches per channel for Meter On/Off, 48v (Phantom), -20db input pad, phase reverse and Mute.


Internal Gain:24 dB

THD+N:0.10% - 25% (@ +2dBV)

Response:8Hz to 28kHz

EIN: -100dBu


Tube:1 x 12DW7 (ECC832)