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Tentlabs Mini E-Choke (100mA)

Tentlabs Mini E-Choke (100mA)

Price: $43.00

Mini E-Choke is very compact for current below 50mA. It is suitable for preamps.

Like the bigger E-Choke, Mini E-Choke replace traditional chokes that generally work quite well, but suffer from serious disadvantages:

• high weight
• relatively big size
• magnetic field radiation that induces hum in the circuit

Mini E-Chokes effectively solve all these issues, and offer up to 60dB supply ripple reduction.

 

Specifications

Electrical
• maximum current 100 mA
• maximum Vdc 800 V
• internal limit: no
• inductance 10 H
• maximum voltage drop @ Imax 9 V
• short circuit protection no
• protected for inverse connection yes
• maximum heat production 0,9 W
• minimum capacity C1 47 uF
• optimal capacity C1 = C2 100 uF

 

Specifications

Mechanical
Module size: 26*15*15 mm (W*L*H)
Hole pitch: 14 mm (symmetrical). All pin diameters 1.0 mm, pin length 9 mm
Mass: 12 gram

 

Manual

Manual can be downloaded in Tentlab website here.

Warrantee

This module is warranted for 5 years by Tentlabs (the Netherlands), assumed all mounting instructions are followed

For other shipping options, Check our Website by clicking the icon below:

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Tentlabs Mini E-Choke (50mA)

Tentlabs Mini E-Choke (50mA)

Price: $37.00

Mini E-Choke is very compact for current below 50mA. It is suitable for preamps.

Like the bigger E-Choke, Mini E-Choke replace traditional chokes that generally work quite well, but suffer from serious disadvantages:

• high weight
• relatively big size
• magnetic field radiation that induces hum in the circuit

Mini E-Chokes effectively solve all these issues, and offer up to 60dB supply ripple reduction.

 

Specifications

Electrical
• maximum current 50 mA
• maximum Vdc 800 V
• internal limit for I larger than 68 mA
• inductance 78 H
• maximum voltage drop @ Imax 12 V
• short circuit protection no
• protected for inverse connection yes
• maximum heat production 0,7 W
• minimum capacity C1 27 uF
• optimal capacity C1 = C2 47 uF

 

Specifications

Mechanical
Module size: 26*15*15 mm (W*L*H)
Hole pitch: 14 mm (symmetrical). All pin diameters 1.0 mm, pin length 9 mm
Mass: 12 gram

 

Manual

Manual can be downloaded in Tentlab website here.

Warrantee

This module is warranted for 5 years by Tentlabs (the Netherlands), assumed all mounting instructions are followed

 

For other shipping options, Check our Website by clicking the icon below:

Store

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Tentlabs E-Choke

Tentlabs E-Choke

Price: $89.00

The E-choke replaces traditional chokes that generally work quite well, but suffer from some disadvantages:
• high weight
• relatively big size
• magnetic field radiation that induces hum in the circuit

The E-choke effectively solves all these issues, and offers up to 70dB supply ripple reduction at currents up to 500 mAdc. In addition, intermodulation distortion reduces dramatically, see the measurements and background articles below.

Pasted Graphic
UL40-S2, triode, distortion no E-choke

Pasted Graphic 1
UL40-S2, triode, distortion with E-choke

Look how effectively the choke removes the hum, but also dramatically reduces the intermodulation products of the signal (1 kHz) with power supply ripple (100 Hz)

 

Specifications

Electrical
• Imax out 500mAdc
• Vmax in 450Vdc (can be adapted to 600Vdc max when changing input capacitor to suitable working voltage)
• Vripple 15Vtt (maximum input ripple)
• C-in 330uF/450V (included on module):
C-in may be reduced linearly when current consumption is lower than 500mA
C-in must be reduced when valve rectification is applied
• C-out 330uF/450V (externally required, recommended value)
• Voltage drop <17Vdc (in-out at 500mAdc load)
• Dissipation <5W
• Heatsink integrated, connected to gnd
• Rejection :
>40dB, time modus off (mostly used with class AB amplifiers)
>60dB, time modus on (recommended for class A amplifiers)
• short circuit NOT protected, always include fuse at module output

Specifications

Mechanical
PCB size: 72*50*50 mm (W*L*H) (includes electrolytic, excludes standoffs)
Hole pitch: 63*41 mm (symmetrical). All hole diameters 3.2 mm

Manual

No manual yet, but Tentlabs is working on it. Connections are fairly straightforward, see example below:
E-choke application
You may want to change the 1N4007 to the better sounding BYV96E

Warrantee

This module is warranted for 5 years by Tenlabs, assumed all mounting instructions are followed

 

For other shipping options, Check our Website by clicking the icon below:

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TentLabs Tube Heater Supply (2.5V to 13V / Max 1.5A)

TentLabs Tube Heater Supply

Price: $49.00

Purpose

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 driver.

Application

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.

Specifications

Electrical
• 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

Mechanical
• 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.

Pricing & warrantee

5 years of warrantee by Tentlabs (the Netherlands), assumed they are built in according application information.

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Tentlabs Tube Filament Supply (1.5V to 9v / Max 2.5A) (pair)

Tentlabs Tube Filament Supply

Price: $179.00

Purpose

TentLabs filament supply is designed to heat DHT’s the cleanest way possible, without affecting the music currents generated inside the tubes’ heater. The supplies generate a very low noise output, while maintaining its’ high output impedance. Result areas are:
• Bigger soundstage
• Better focus
• Cleaner tone
• Better resolution

Application

A typical example is shown below:
Application

Each tube needs its own filament supply, in turn fed by a separate winding from the power transformer. The whole supply then is floating, and only has one connection to ground, as shown above. This example above shows the DHT in fixed bias mode. When using cathode bias, the grounded leg has to be connected to the top of the cathode resistor instead.

These are the only connections to the filament, so no caps, no hum-bucking pot, no nada!

The total output current is limited, depending on the version, but they all start-up slowly. Especially when the tube is cold, this is a nice feature. Cold tubes, when heated with traditional supplies, draw currents up to ten times their nominal current. Using TentLabs heater supply will gently switch on your tubes.

The units are factory adjusted at your order. After installation, the supply needs minor DC adjustment, to compensate for possible voltage losses in the wiring (some 100 mV are easily lost at high currents). During use, no adjustments are needed anymore, not even after changing the tubes !

The new generation filament supplies has an over temperature indicator and shutdown, in case the heatsink-temperatue exceeds 90C. The LED and wiring is supplied separately with the modules.

 

 

Specifications

Electrical
All versions
• Output Voltage adjustable between 1.5V and 9V, specify when ordering.
• Higher output voltages available on special order
• Output current: automatically adapts to required level to reach voltage specified above.
• Input voltage should not exceed 1 V above specification (see application info).
• Output noise < 20 uVrms (1 Hz – 20 kHz).
• Output hum < 200 uVpeak at 100Hz / 120Hz.
• Output impedance 10 mOhm at 0Hz.
• Output impedance 10kOhm > 5Hz.
• The heatsink is electrically isolated from the circuit and can be attached to a chassis
• Over-temperature shutdown with LED indication

Mechanical specifications

• Total size 50*90*40mm (W*L*H, heatsink included, standoffs excluded).
• Weight each 90 gram (each, excluding packaging)
• Hole pitch 41* 81mm.
• Needs 10mm stand-offs to mount on chassis, supplied with modules.

 

Warrantee

5 years of warrantee is provided by Tentlabs (the Netherlands), assumed the products are build in according application information.

 

Support

As this is a true DIY product, so no additional support can be given, more infortmation can be found in Tentlabs website.

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