Linear Audio T-reg V5

A high-voltage, low noise, fully protected regulator for tube circuits

T-reg is a high voltage regulator aimed at tube-level high voltage amplifiers. Diyaudio offers a partial kit for this unit, consisting of the PCB, the high speed opamp, the series pass MOSFET and a current source MOSFET. The PCB comes with pre-installed Constant Current source and reset pushbutton. Other parts are generic and probably in most people’s parts bins or easily available (see BOM).

T-reg can provide an output voltage between 0 (probably less useful) up to 500V, at currents up to 400mA. T-reg accepts input voltages from a transformer/ rectifier/capacitor supply up to a maximum of 500V.

Performance is very good, with less than 10uV broadband noise, and less than 20mΩ output impedance. That means a clean supply that doesn't sag with varying load. The PCB has an on-board heatsink for the pass device, but the pass device can also be mounted on a larger heatsink or on the chassis for high current applications.

Both the output voltage and the current limit can be set by a single resistor.  If the current limit is exceeded for more than a fraction of a second, the regulator shuts down to protect itself and the load.

PCB size is approximately 3.1 x 2.3 inch (78 x 58 mm).

Designed by Jan Didden of Linear Audio.

Other parts are generic and probably in most people’s parts bins or easily available (see BOM).

More Information

• T-Reg Article
• T-Reg BOM
• T-Reg Circuit
• T-Reg Stuffing Guide
• T-Reg Discussion Thread