TentLabs Tube heater Supply

This module is intended to supply the heaters of indirectly heated tubes. It is compact, low drop, does the full job from AC-in to DC-out covering an output range from 2.5V to 13V.


TentLabs heater supply is designed to supply the heaters of indirectly heated tubes. Its' main use is feeding phono and linestage tubes, to keep the hum levels down. The module can also be applied to feed other circuits, like the CDpro CD drive used in our CD player. For this purpose a fast switch-off function is available.


The heater supply uses Schottky barier diodes for rectification.
They provide clean switching and inhibit low voltage drop. 2 filter capacitors (6.800uF each) smooth the voltage. A discrete design, low drop voltage regulator feeds a power transistor at the output.

A tenturn timmer allows for accurate adjustment of the output voltage.


More tubes can be connected in parallel, assumed their respective heaters are at equal potential. If heater potentials are different, separate modules (and transformer windings for each module) are required. The heater reference needs to be connected close to the tube The total output current is limited to 1.5Adc, mainly due to heat dissipation. The units are factory adjusted at your order. After installation, the supply needs no adjustment.

A fine example of a Squeezebox power supply is shown here (Dutch only)


• Output adjustable between 2.5V and 13V, specify when ordering
• Output current maximum 1.5A
• Input voltage should not exceed 1 V above specification (see application info - to be written)
• Minimum input voltage 4 Vac
• Output noise < tbd uVrms (10Hz - 20kHz)
• Output hum < tbd uVpeak at 100Hz / 120Hz
• Output impedance < tbd mOhm
• Fast switch-off function available on request (required if used to supply 9V section of philips CDpro CD drive)
• The heatsink is not electrically isolated from the circuit and should be isolated from the chassis
• The output is not short circuit proof

• Total size 40*60*40mm (W*L*H, heatsink included, standoffs excluded).
• Weight each 60 gram (excluding packaging)
• Hole pitch 31* 51mm, hole diameter 3.5mm
• Needs 8mm stand-offs to mount on chassis, supplied with modules.


5 years of warrantee are valid for the heater supplies, assumed they are built in according application information.


Go to the shop to order online


Look at the [to be written] for detailed mounting instructions. Download a fine example of an alternative application here.


As this is a true DIY product, so no additional support can be given, other than already available at the Tentlabs website.


Though this is a product which if handled properly is save, it is possibly surrounded by high voltages. Working with high voltages requires safety measures and professional behavior. Tentlabs takes NO responsibility for accidents resulting from improper usage or handling.