Chokes, mostly used in tube amplifiers

We have a wide range of chokes and inductors for tube amplifiers, ranging from anode choke LL1667 (operating current from 5 mA) to filament current choke LL7233 operating at 3.4 A

Our chokes are built in our dual coil single C-core style. The use of C-cores with well-defined air-gap results in an almost constant inductance throughout the whole operating voltage range.
Most of our chokes can be ordered for operating current within about 10% of desired value (within a reasonable current range), even if this value is not presented in the data sheet. The column “Capacity” can be used to calculate the estimated resulting inductance for undocumented versions.
For example the LL1638/300mA in serial connection will have an inductance approx. 1.5Vs / 0.3A = 5H.

When measuring/verifying the inductance in this type of chokes, make sure to use conditions similar to the operating conditions.

When calculation the signal headroom in a power supply choke, the ripple voltage from a rectified sinus signal is approx. 42% of original RMS voltage. As long as max voltage ratings are not exceeded, all our power supply chokes can be used in choke input configurations. In applications where the current consumptions is almost constant (such as a class A amplifier), the input current spikes will be significantly less compared to a capacitor input supply.

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Low current chokes, most often used as anode chokes

PhotoApplication
current
(mA)
Type

Configuration
(serial or parallel)		Inductance
(H) 		Capacity
(I * L)
(Vs)

Winding resistance
(ohm)		Weight
(kg)
Typical useUnit price Euro*
VAT excl.
5 – 40LL1667 Serial800 – 1004.052.4k0.75High impedance anode choke€93.04
10 – 60 LL1668 Serial250 – 402.5 6800.75Anode choke€88.60
10 – 100LL2743 Serial440 – 444.54001.35Anode choke€100.77

 

Medium current chokes, most often used in anode voltage power supplies

Photo
Application
current
(mA)
TypeConfiguration
(serial or parallel)
Inductance
(H)
Capacity
(I * L)
(Vs)
Winding resistance
(ohm)
Weight
(kg)
Typical useUnit price Euro*
VAT excl.

150 – 400

300 – 800		LL1638

LL1638 		Serial

Parallel		10 – 4

2.5 – 1		1.5

0.8		36

9		1.35

1.35		Power supply

Power supply		€93.04
100 – 200

200 – 400		LL1673

LL1673 		Serial

Parallel		20 – 10

5 – 2.5		2

1		60

15		1.35

1.35		Power supply

Power supply		€93.04
100 – 200

200 – 400		LL1685

LL1685 		Serial

Parallel		17 – 9

4 – 2		1.7

0.8		130

32		0.75

0.75		Power supply

Power supply		€85.02

100 – 300

200 – 600		LL2742

LL2742 		Serial

Parallel		42 – 14

10 – 3		4.2

2		160

40		1.35

1.35		Power supply

Power supply		€98.26
500 – 1000

1000 – 2000		LL2771

LL2771 		Serial

Parallel		6 – 3

1.5 – 0.7		3

1.5		11

3		4.9

4.9		Power supply

Power supply		€153.04

 

High current chokes, most often used in filament current supplies or for solid state applications

Photo
Application
current
(A)
TypeConfiguration
(serial or parallel)
Inductance
(mH)
Capacity
(I * L)
(Vs)
Winding resistance
(ohm)
Weight
(kg)
Typical useUnit price Euro*
VAT excl.
1 – 2

2 – 4		LL1694

LL1694 		Serial

Parallel		240 – 120

60 – 30		0.24

0.12		1.8

0.45		0.83

0.83		Filament current supply

Filament current supply		€69.76
1 – 2

2 – 4		LL2733

LL2733 		Serial

Parallel		700 – 350

170 – 80		0.7

0.35		3.4

0.9		1.35

1.35		Filament current supply

Filament current supply		€89.47
0.5 – 1

1 – 2 		LL2751

LL2751 		Serial

Parallel		200 – 100

50 – 25		0.11

0.05		1

0.25		0.44

0.44		Small tube filament current

Small tube filament current		€68.31
1 – 3

2 – 6		LL2772

LL2772 		Serial

Parallel		250 – 80

60 – 20		0.24

0.12		0.7

0.2		1.35

1.35		Power supply (low voltage)

Power supply (low voltage)		€99.23
2 – 5

4 – 10		LL2773

LL2773 		Serial

Parallel		160 – 65

40 – 16		0.33

0.15		0.44

0.11		2.5

2.5		Power supply (low voltage)

Power supply (low voltage)		€129.66