Countryman Type 85 DI Box by John Eppstein
The Countryman Type 85 is one of the best general purpose active DI boxes made. I own 4 of them. Although the stated warranty is 5 years I have never known of a case where a (very rare) malfunctioning unit was not replaced no questions asked, even if the owner was not the original purchaser. In 42 years I have only encountered 2 defective units. This device is also as close to indestructible as it is possible to be. All components are mounted on a u shaped aluminum shelf that slides into a monolithic aluminum extrusion that protects all switches and jacks from damage and is so rugged that you can literally drive a truck over it without damage.
The only general purpose DIs I know of that can match the Countryman for sound quality are the Radial actives and they don't come close to being as durable.
In speaker mode this box can take the output of any known instrument amplifier. It can accept the equivalent of 1,700 watts before it begins to distort.
Input and output 1/4" jacks, XLR mic level output with ground lift switch. Input sensitivity selectable between instrument and speaker. Phantom or battery power. FET input circuit for extremely high input impedance - this box will not load your pickups or affect the tone of your instrument. Class A discrete circuitry, epoxy potted. 400 hour battery life. 20Hz-20kHz +/- 1 dB. Input protection 220VRMS/20,000V static discharge. Voltage gain: -10dB-pickup/-46dB speaker mode. RF filtering: input - 250kHz, output - 30kHz. Max input level, pickup mode - 5V p-p. THD - .018/1kHz 1V p-p. IMD - .08 10kHz/60Hz 1V p-p. Input resistance - 10 Megohms (10x the input of a typical tube amp.) Input capacitance - 160 pf (equiv. 2 ft. of low capacitance guitar cable. Dimensions - 1.75x3x5 inches.