Verstärker 41 →
The device is housed in a typical standard size panzerholz
equipment case, as shown in the image on the right. The actual amplifier
occupies the top 2/3 of the case, whilst the bottom half has various
storage compartments for the LT/HT batteries, options, accessories and
Like its predecessor, the LE-35,
the amplifier of the LE-40 is built
around three RV2 P800 valves that are accessible directly
from the front panel for easy maintenance.
A spare value is located in a socket
at the top left of the bottom section.
Up to 8 lines can be connected simultaneously to the terminals on the
left side. At the left of the front panel is a
series of switches, eight of
which are used to select the line that will be monitored.
The rest of the front panel holds an
instrument (meter), a
volume knob and
a knob to select the required line impendance,
between 40 and 5000 Ω.
The device has a built-in 11-stage filter that removes any hum from the signal
that is caused by the harmonics of the 50 Hz mains frequency.
Along the top edge of the front panel is the
identification tag, which
reveals the model (LE 40), the serial number (2818), the manufacturer (bxv) 2
and the year of manufacturing (1942). The the left of the identification tag is
a stamp ("Ark.") to indicate that this device was suitable for use under
arctic conditions. To the right of the tag is the Wehrmacht acceptance stamp
(WaA. 584). 3
The device featured here has manufacturing code (bxv), which was
assigned to Algemeine Elektrizitäts-Gesellschaft, Kabelwerk Oberspree.
The company was commonly known as AEG.
According to , the code (bxv) was assigned to AEG, Kabelwerk Oberspree.
WaA = Waffenamt (German Army Weapons Agency), tasked with overseeing
Germany's rearmament process. Also tasked with and quality control and
acceptance (Abnahme) of new equipment.
Lauschzange LZ-35 was a current probe that was mounted around
a single wire of the analogue telephone line that had to be monitored,
without galvanically touching it. This made the device virtually
undetectable, as it did not affect the line in any way by causing a
load or a disbalance.
The image on the right was taken from the
[C], and shows
the device intercepting an outdoor telephone line.
The device was not small. It measured 120 × 70 × 60 mm
and weighted 590 grams. At the bottom of the cylindrical
enclosure are two screw terminals
for connection to the Lauschempfänger, plus a strain relief
ring for the amplifier wires.
Inside the device is a current transformer with a O-shaped core.
Part of the core is hinged, to allow it to surround the wire that carries
the audio. The transformer picks up the alternating magnetic
field that surrounds the wire during a conversation, and feeds it to
The LZ-35 was originally supplied with the
intercept amplifier LE-35,
but also with the later LE-40.
It was also used with the small and portable
Drahtlauschempfänger D.L.E. (kl).
- Intercept amplifier LE-40
- Pair of headphones
- HT battery
- LT battery (accumulator)
- Current probe (Lauschzange) LZ-35
- Spare valve RV 2 P 800.
Gain~ 12 Neper (≈ 72dB) 1
Impedance40, 160, 600, 1600, 5000 Ω
Filter11-stage for odd harmonics of 50 Hz
Valves3 x RV 2 P 800
HeadphonesDfh. f 4000 Ω, or Dfh. a.
Dimensions461 x 361 x 260 mm
- Günter Hütter, Information about D.L.E. (kl)
Retrieved July 2017. Photographed with kind permission.
- Liste der Fertigungskennzeichen für Waffen, Munition und Gerät
Manufacturing codes for weapons, ammunition and equipment (German).
Berlin 1944. Reprint 1977, Karl R. Pawlas.
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© Crypto Museum. Created: Wednesday 02 August 2017. Last changed: Saturday, 21 October 2017 - 14:05 CET.