Hagenuk HA5K39a with Feldhell Mode.


This is my new German radio. I purchased this radio in oktober 2023, by an exchangement with another radio.

The Hagenuk HA65K39a is a German navy transmiter receiver, which is used on small navy ships or at a naval base on mainland.

It has a seperate receiverpart and a seperate transmitterpart. The receiver is a TRF receiver with only one HF stage, a regenerative detector and one LF stage. All tube types RV12P2000 . The transmitter is a two stage transmitter, with a RL12P10 as a final amplifier. One modulation stage, also acting as a tone oscillator for MCW and sidetone for CW. Tubes are RV12P2000. A stabililizer tube for 150 volt. GR150A.

Provision has been made to tune in the transmitterfrequency to the receiverfrequency.

The modes are phone, CW en MCW. Power is 8 watts on phone and 10 watts on CW

Below the Hagenuk HA5K39a.

Left the receiver and at the rig.ht the transmitter

Below the powersupplies for 300, 200, -50 and 10 volts DC. Also for 12 volts AC. The 200 volts DC is stabilised with a EL84 tube.

Plans were made to make the radio suitable for Feldhell Mode. Normally the a version is not suitable for Feldhell Mode, the versions b and c do.

So I had to make a small change in the internal transmitter part.

The picture below is the change in the schematic diagram.

The main changes in my A version to be done, is to be seen in the diagram up, is:

1 – Desolder the kathode connection to earth.

2 – After disconnecting one of the telephone connection at the front, Solder a wire from the kathode of the PA tube to that disconnected telephone connection. This connection is to be used for the drum contacts of the Hellschreiber. So from the Hell connection on the wsitchbox two wires to that the disconnected telephone entree.

3 – Make a switchbox with a switch for bypassing the CW key connector. Make 2 wires from the normally open contact of the witch to the key input on the front. Switch contacts closed >>> transmit, switch contacts open >>> receive.

4 Switch (Betriebschalter) the mode on the HA5 to CW.

Now the HA5K39 a is suitable for Hellmode. It is a kind of kathode keying of the transmitter poweramplifier by the Hellschreiber drumcontacts, just in the same way, done in the B or C type version of a HA5K39. And it is safe. The contacts of the drum must not exceed 100mA or 150 volts DC. Better some less. So the current now at key down, is about 55 mA at a voltage of 0 volts (kathode keys to earth).

Picture below the front of the Hellschreiber with the connection panel. The big connector is is a homemade one with two contactstifts, to pin 3 and 4 of the Hellschreiber.

Picture below the front panel on the HA5K39. The connector is a homemade type, not done by myself. Also the switchbox with the switch for transmit or receive. Below the connection to the drum contacts of the hellschreiber.

Picure below some received text on the paperstroke of the Hellschreiber. A qso with PA0AOB, Arthur, PA0KDF, Koos.

Below my first test transmission in Hellmode with the HA5K39. A screen of decoded Hell text .BY the PC programm of IZ8BLY. Monitored myself at the websdr of Maasbree. Beautiful thin charactors. That means that the 900 Hz pulses are very well.

Below picture is a reception of my Hell Mode signal from Helge Fykse, LA6NCA in Larvik Norway. That was at 15:00 hr GMT with increased propagation, during the Hell net. My transmitter was the Hagenuk HA5k39 a with 10 watts. Ofcourse I used the Hellschreiber too.

I was a bit proud of it. My report was 456 rst. Not bad at all. Distance about 900 km straight on. Also Arthur, PA0AOB had a good signal.

Ofcourse lateron there appeared some troubles. But I fixed it all. One was, that the frequency of the transmitter drifted quit a lot. About 400 to 600 Hz. That is to much for Hellmode.

And why?

The problem with radio tubes in free running oscillator stages, is the the warming up of the tube. The heater and anode/screen current warms up the tube. Because of that the so called anode capacity and grid capacity are increasing. Bij warming up the electrodes , like anode and screens, the material of it expands. So the capacity to earth is increasing. This capacity influences the resonance frequency of the various coils. So frequency will decrease.

But especially when there is a high anode and screen current, this effect is increasing. So you have to make the anode and screen current as les as possible. Then warming up gets less. The RV12P2000 has a 12 volt heater, so gets pritty warm, even if there flows no current in the tube. If the heater should be 2 volts, then you get almost no warming up of it.

In my situation:

There are two ways for warming up the oscillator tube:

1 – warming up by the heaters.

2 – warming up when the oscillator is working.

The first cause cannot be avoided.The heaters must have supply. So always a warming up.

The second cause is only happening when key is down during CW Mode.

During receive in CW Mode, the anode gets constantly HT supply, a little anode current is flowing. The sreen gets HT supply during key down at transmitt. but the waming up of the tube is less, so the frequency drift. Increased current will flow at key down (transmitt). During key up (receive), there flows a little current. So is increasing during key down. So warming up and so frequency drift, is during more by key down.

I decreased the drift first by increasing changing the screen resistor of the oscillator, a RV12P2000, , from 12 kohm to 47 kohm. The voltage on the screen went from 123 volts to 100 volts. The screen current from 4,7 mA to 2,5 mA. So the anodecurrent is decreasing at key down.

Second I placed an extra resistor of 15 kohm in series with the ande of the oscillator tube. The voltage decreased from 197 volts to 152 volts. The anode current is now 3,8 mA, less then with the original value of this resister. The oscillator is working still very well, so the start up is. But the drive energie for the PA is some less. The total warmingup has been decreased a lot. So the drift of the frequency.

The drift is very acceptable, because of those changes. Especially increasing the anode resistor did influence the warming up/frequency drift.

You should expect that the power output of the transmitter would be much less. Because the oscillator output is less by the decreased anode current. But the power output of the transmitter is now a little less, about 9 watts instead of 10 watts on CW. But sufficient.

Ofcourse you have to hold on a warming up period of the transmitter, say a half hour to stabilise the the warming up of the oscillator tube by the heater. After that you start to activate the transmitter. And with the precautions of above, you will get the most stable frequency in Hell Mode.

Restauration receiver LO6K39.

Recently, I  perchased a  LO6K39 in very bad condition, uncomplete condition. It came with a seperate case, case frontcover and  a spare coildrum.

The receiver was bought by the former owner in de 1980’s and was “modified” by him. Like many surplus radio was done at that time.  A whole unit with LF-, a part of the detector- en CW filter stage  was removed. What a pity. Some mods are not always better.

Instead of it, some new hardware was added.  All this with integrated circuits etc.  There was no documentation with it. So a lot of work, finding it out, what it was and how it was functioning. But making a new circuit diagram, how it was functioning, was too much.

So I removed all the new hardware. And was finding out, where all the wiring was going to.

Also the frontcover was missing, so the voltmeter on the front. All original knobs were missing, so the mainswitch too.

But I decided to give it a try, to let it work again.

In the pictures below you can see the transmitter, when it came to me.

LO6K39 Ton B

The front without the cover. Watch the big square hole in it, where in normally the “on/off”switch and CW filter was placed, all removed.


The inserted new hardware with the PCB’s and integrated circuits.

First, I cleaned the chassis from all dirt etc. It was very dirty, it was in backstore more then 30 years.

The coil drum was not rotating at all. Much hardened grease between the geer wheels. I had to clean them, took a lot of time. In most german equipment that grease is fully hardened and have to be removed. New grease had to be added.

Next,  I had to add some missing parts of the detector stage and a new LF stage. The detector stage with a RV12P2000  tube and the coils were there already.

In series with the anode I added the missing  HF choke, and a LF choke to the high tension voltage and some decoupling condensors.  By lack of the original components, I used the primary side of a little AMROH LF output transformator and a little little ferriet  choke, suitable for the used frequency. The HF choke for preventing  HF energie to the LF stage and the LF transformer to get the LF info for the LF amplifier.

A new LF amplifier with a RV12P2000 tube. Just in style.The input conected by a 10 nF capacitor to the hot side of the LF choke.  The circuit is the same as seen in the circuitdiagram of the LO 6K39. Only no 2000 ohm secundary side, but a 8 ohm one.  Proving just enough gain forthe use of a headphone.

I made a new frontcover for the receiver. Also a new antenna post was made on the front.

Now I inspected the powersupply, which seemed to work well.

The mains power cable was connected directly on the entrance behind the receiver. Maybe I will put a switch on the cover. But I hope once to get another original unit. However hard to get.

I switced the receiver on now, but nothing was to be heard, no noise or signal.

After examing it all, there was no HT on the anode and screen connection on several tubes.

So I cleaned the contacts on the coil drum, I readjusted them for making good pressure contact on the drum and tried it again. I also inspected alle the coil units too.


The contacts of the coil units of the drum. The 5/VI K  on the coil unit means: 5-th frequency band,  coil stage 6( detector stage), K for “Kurzwellen” (shortwawe) Showing an L, it means a coilunit of a Long Wave receiver LO6L39. And not suitable for shortwave.


My spare coil drum. Above the revolver mechanics.

The receiver came alive at bit.

Now I noticed the detector stage did not oscillate in CW. It seemed to be something wrong with the resistance of the anode coil in the detector coil unit. I was lucky, because I had a spare one from a seperate spare coil drum (picture above). After replacing it, I saw it oscillating on my oscilloscoop instrument. But still no extra noise in the haedphones. It seemed that it was not on frequency.

For instance, when you tune the receiver in on 3600Kc, the detector must oscillate in CW also on 3600 Khz.

So I putted it on frequency. With the help of a frequency counter. Now a lot more of noise in CW.

I connected now a RF generator to the antenna post and setting it at 3600 Kc., with very low output of course.

I retuned al the HF stages of the receiver, by measuring the LF info at the LF output stage.

Now I heard various CW signals . Even SSB. The receiver was working again.

Only without a nescessary CW filter in it. The “Tonsieb”. It is in the missing unit.

But maybe in future I will add one?

It was a nice project doing it. It took a lot of time, but I was very satisfied about it.

The new frontcover , and the receiver in its case.


Side view receiver in its case


The new LF amplifier with the RV12P2000


Just right above the LF output transformer, Right below the RV12P2000 tube and left below the LF transformer as a LF choke.

German Funk Horch Empfänger d.

Receiver Funk Horch Empfänger d.

In this post my new beautiful German receiver, the Funk Horch Empfänger d.

For a better picture or schematic diagram, just click at the picture. To go back, just click right of the picture or schematic.

At the  time of  world war 2, even before and also today, armies and also of course armies  in world war 2, so the German Wehrmacht, were listening at all frequencies, from long wave, medium wave, short wave till VHF. Not only enemy stations, but also the normal broadcast frequencies. All these to check them for correct transmissions and also to intercept  enemy transmissions for important information etc. Even in Germany, radio amateurs were checked out in the beginning. But very soon, they were forbidden, because they were not important to the government.

These “Funk Horch Empfängers” were very sensitive with a lot of functions to receive even small signals at any mode, like A1, A2 and A3 transmissions.

A various amount of receiver types,  a, b, c, d and f for all different frequency bands, were placed in listening centers. For these listening centers,  called the “Fu 14”, were 10 Torn, E.b’s,  3 large short wave receivers KW-E a, 2 Horch Empfanger Fu.H.E. a/c and lateron also 2 Fu.H.E.d in use.

Also special troops from the Wehrmacht used them in a portable way, the “Funk Horch Truppe”. The name  for troops, who used the type D, the F.H.E. d , was called “Fu.- Horch-Tr. d”. Code name was “Horst- D”.



Enemy radio interception with a Funk Horch Empfänger.

Some documentation:

Manufacturer: Telefunken, code name bou. Each manufacturer had its own code, for instance Lorenz was dre.

Type d.

Valves: 12 RV2P800.

Range: four ranges white, red, yellow and blue.

24,8 -31,7 Mhz, 30,45 – 39,30 Mhz, 38,82 – 49,35 Mhz, 47,90 – 51,90 Mhz.

modes: A1, A2 and A3.

headphones: type DFHa 2000 ohm.

The receiver is a super heterodyne type with a continuous variable bandwith by means of a crystal at 3000 Khz.

Also a CW filter is included at 900 Hz, “Tonsieb”.

Containing 2 RF stages, 1 mixer, 3 MF stages, 1 audion stage and 2 LF stages.

Also one stage for the CW oscillator, containing 2 crystals. Two frequencies for the oscillator can be chosen, TG 1 and TG2. Just 900 Hz down and 900 Hz above the carrier. When a unwanted signal is just down the carrier, the CW oscillator can be switched just 900 Hz above, so no problem any more to receive the correct signal.

In position TG1, a calibration signal is to be heard at several marker points of the frequency band scales, to check the frequency. This after pushing the calibration button on the front of the receiver. The antenna signal is switched off, and the calibration signal is fed to the entrance of the receivers first RF stage. Amazing fact is, that in my receiver, the frequency scales are still calibrated after 70 years! Also the sensitivity is equal over the whole band.

The MF stages at 3000 Khz, contains one crystal. The bandwidth is variabel . The calibration of this is also the same as 70 years ago!

Power supply is  housed in a separate housing or transport case,  providing two volts of a lead acid batteries and one 90 volts static dry battery. The  type leadacid battery is the 2B38 and 2 static HT anode batteries.

The receiver is complete original, inside and outside, so his case, and has it’s original color.


The front of the receiver. All functions are good to be seen. For increasing the size of the pictures, just click on them.


Side view of the receiver.


Side view. From left to right above: Upper row 2 RF stages, nr. 1 and 2, the mixer valve and the balanced  (Gegentakt) receiver oscillator. Lower row,  from left to right below: the 3 MF valves.


Other side view: above the coil holder of the HF , mixer and oscillator part.  Each wave band has its own combination of 3 blocks. The contact fingers are to be seen just at the above side of the picture.  When changing the waveband with the big knob on the front, first the contact fingers are lifted, then it rotate, and when in position, the fingers are released and make contact with the coils contacts in the holder.  It is a common construction often used in German equipment.

The 3 coil blocks, for each wave band,  in their housing, seen in the mid of the picture, are easy to replace.  Below the power supply entrance and 2 entrances for the headphones of 2000 ohm.


Back side. here to be seen the Audion-, the audio- pre amplifier- and the audio- final amplifier valve.


A view of the power supply entrance and the haeadphones. left the LF output transformer, which is a different one, the original is replaced because of malfunction by another German one.


Upperview of the receiver. left the diodes for the AGC, eg “Mit Reglung”. In the mid the contact fingers for coils connections. Also to be seen the variable condenser for tuning the antenna. At the right the switch for measuring the anode currents for all the valves, to check them on the test meter at the left above corner on the front. All indications on the meter into the blue part of the scale. But the AGC ,”Reglung aus”,  switched off, the audio gain on maximun and switch mode,  “Tg1-Tn-Tg2” at TG 1.

Furtheron, the receiver in in good working order. All his functions are working. The only component I had to exchange was a faulty condenserblock at the right side of the receiver, number 234, powersupply,  in the schematic diagram, which was very leaky. I did restore it, by putting a new one, electrolytic one of 47 uF-500 volts Dc, into the inside. It is like new now.

Also I cleaned all the electric contacts. And lubricated the mechanical aches of switches, scale driving aches etc..

Grund Schaltbild

The principle schematic diagram. Note, that it concerns only the type d. other types, like a, b etc. differ in schematic. All valves are RV2P800.


A close up of the receiver between other German equipment in my collection. Left the KWEa, at the right the LO6K39.

Torn. Fu. b1

This is a transmitter receiver which was in action by the troops in the frontline. Or also used in small cars like the “Kubelwagen”.My set is of the year 1936, is fully in working condition on Phone or CW in the 80 meter radioamateur band with only 400mW output at the antenna.

Watch the text “Feind hort mit” on the front. It is a warning for the radio operator that the enemy is listning too. So mind your words.




The first picture  the Torn. Fu b1  near the receiver KWEa . The second and thirth  picture,  the Torn. Fu. b1 in action at the radio fielddays at Kootwijkerbroek in 2002. It is me on the second picture working with it. The antennais a replica toploaded vertical, a copy of the original one. I made at this field day many pleasent qso’s with the mobile station PA0LCD, now PA0AM, Cor, in the neighbourhood of Kootwijkerbroek. The Torn. Fu b1 was doing very well with its 150mW phone modulation. My experience is, working amateur stations at a bigger distance, only CW is suitable, because it’s low power output.


Picture above: German Army on his way with the Torn. Fu b1 as a man pack at his back. At the back of the left soldier, the battery case  of the B-1.


Funker somewhere in winter Russia.


Funker in Trench, where?

Tornister EmpFänger b

Tornistor Empfanger b (Bertha ).

The receiver is build in 1940 by Telefunken.

This shortwave receiver is a direct conversion, 2 stages HF , 1 “Audion” detector and a LF stage. All tubes are of the type RV2P800. The feedback or reaction gain in the detector stage is tuneble with the little knob below the small scale of it.    This makes the receiver suitable for CW and even SSB and becomes then very sensitive and selectief.

It is a very well working receiver for listning at the amateurbands.

The headphones is the DFha. The elements have an impedance of 2000 ohm.

It is used by the army (Wehrmacht) in the field, it could be carried on transport, at the back of the wireless operator.

It was also used in radio vehicles as a mobil station.

Tornistor E b

Tornistor Empfanger Bertha from 1940.

EWc up

This is the vibrator powersupply, type EWc,  for 12 volt DC. Used in vehicles.

EWc top

View on the upperside of the EWc. Left the vibrator and filement resistor lamp. At the right the spares.


Here in the mid, the vibrator powersupply, type EWb. In use for the Torn. Eb in portable situaties. The supply is the 2 volt DC from a lead battery. This battery is shown at the left, type 2B38. At the right a copy of the HT static battery for 90 volts DC.

All the 3 item are housed in a special battery case,  mounted just below the receiver.


Radione equipment.

Although these radio’s, like a R3 receiver and a RS20 transmitter,  are not  in my collection anymore, I decided to keep the whole post in my website. This because a lot of documentation and pictures is in it. Probably people can make their advantage of it.

But.….. a little time ago, I purchased a new Radione R3. This because it is just such a beautiful and handy shortwave receiver. See pictures below.



The R3 is a beautiful and well working receiver. Only the cabinet and front has been repainted.  But it is a good original color. Also the vibrator power supply is missing. But maybe it can be placed from a spare receiver in future.

This equipment was used by the Navy (Kriegs Marine), often on small ships.

Also it  was also in use by the German Abwehr and even by the Wehrmacht in bunkers.

The receiver type R 3 was used in combination with a small transmitter called RS 20, but also with the transmitter Lo40K39f. Frequency covering for the the R 3 is 2 Mc-25 Mc. The tubes inside the receiver are all different and are also  called: “Stahlhelm Rohre”. It has a build in  power supply for 110 120  or 220 volts and a vibrator supply for low voltages like 12 or 24 volts.

The transmitter RS 20 covers 3.000 Kc – 14.600 KC in 3 bands. It is for AM, CW and MCW. With this combination I made so many excellent qso’s in the 80 meterband, crystal controlled with AM.

The RS 20 transmitter.



radione opstelling

Tuned at 3705 Khz.

RadioneR3 aftemschaal


Here an original picture of a wireless operator or “Wehrmacht Funker”, working with the RS 20 and R3 in a bunker. Left a DR 78 transmitter/receiver, made by many manufactories , for example also Philips, in WW2.

Navy receiver LO 6 K 39, former German Kriegs marine.

Normally it was produced by the German manufacturer C. LORENZ AG, in Berlin Tempelhof, but also by  others, for instance in Austria during the “Anschluss” with Nazi Germany.

It is a amazing design for a TRF receiver.

LO 6 K 39 1

The receiver in the picture above is made by Schrag Ericson in Wien Austria. Typical are the missing name plates on the front, while on types, made by Lorenz, they are there.

On the blue nameplate, there is also a code  of 3 characters, called bvx. This means that the manufacterer is Schrag Ericson in Wien, Austria. Although on the Lorenz receiver, it is missing, only the date of manufacter is there. Normally BOU stands for Lorenz AG.

It was in use by the German Navy on their war ships like the Schwerer Kreuzer,  Prinz Eugen, Bismark for example.

Also used in the desert by the “AFRICA CORPS” of Rommel.


2 maal LO 6 K39

On the right another receiver, made by Lorenz. This one is working very well.

The Lo6K39  a is s a short wave TRF receiver, covering 8 frequency bands from 3000 kc till 25000 kc. There or more versions like the d type, which differ in frequency covering and some hardware.

It has 3 HF stages, for each frequencyband 6 tuning coils, 1 audion stage, 1 LF stage and 1 crystal calibrator stage. All stages contain a RV12P2000 penthode valve.

The receiver has a great selectivity!  Because it has 6 tuned circuits in front of the detector stage. Warning: don’t try realign these circuits, it will end into a failure!

Also a CW  LF filter at 800 Hz is included ( Tonsieb ). This makes this receiver to a excellent choice for detecting CW signals. Just a 8oo Hz tone, no noise etc..

Also the crystal calibrator workes well. It gives 100 Kc signals all over each wave band. However in my receiver, the Austrian one, it has been removed.

Furtheron, the receiver has been excellent screened at all fronts. Also the poersupply lines in side were also fed through by many chokes. Because they were very afraid, that the radiation of the detector would come outside the receiver. So would be noticed by the allied listning stations. But because of the 3 HF stages, it was most unlikely.


Another reason, the the German Kriegsmarine did had  chosen for a TRF receiver, instead of a super heterodyne concept, was:

They were very afraid for receiving socalled gost signals. Signals which were in fact not there. At the war ships, there were plenty transmitters in use, with their antennas close together. There might be very much spureous signals in case of a superheterodyne receiver.  At the TRF concept, is what you hear, is also really  there. No doubt about that.

The reaction of the audion stage is variable. The down left knob is a twin one , the centre knob is intended for the gain ( audio ), the outer one is a kind of frequency shift, from the centre of it’s scale you can vary the frequency 3 kc downwards and upwards. This workes very pleasant for receiving CW or SSB signals.

The audio impedance is 4000 ohm. A original headphones, a Dfha, is suitable for this.

The powersupply is inside the receiver cabinet.

The weight of the receiver is 65 kilo’s!



The schematic diagram.



LO6K service meter and switch4

On the above right corner is a little meter , you can measure the HT en LT  of the power supply. This doing by pressing or depressing the one of the 2 little knobs on the meter.  With the switch below, you can measure the kathode current of all the valves.

Just left above there is a black cover, which covers a neon lamp, this neon lamp protects the receiver input from the very high HF voltages from other transmitters on the ship (200 volts pp Voltage max.). The HF voltage part of the electro magnetic field, is very high, because of the short antennas , which establish this HV field especially and the high power output (hundreds of watts) of the transmitters in use.

Waveband drum

Above the view of the drum containing  the tuned circuits  units of each wave band. The coverplate has been removed for showing it.



A side view of the receiver, in the holes, the valves RV12P2000 are placed  in their sockets.

Waveband revolver fixation 8 steps

LO 6 part of revolver

The fixing plate (revolver system ) to fix the correct stand of the drum, for each wave band. The contacts are making correctly contact with the various stages in the receiver. With the big handle on the front panel, you can change the wave band. This by this revolver system. Very nice in this system is, that just before turning the drum, first the contact arms are lifted up, just after it, the drum is turning!  Then the drum is fixed correctly, just after that the contact arms are going down and make contact wth the contacts on the tuned circuits inside the drum. In this way, keeping the contact in good order! It is a amazing design!

LO6K39 018

Above the view of variable condenser for tuning the receiver. The cover plate has been removed for this purpose.

LO6K39 007

The beautiful tuning scale of the receiver. The receiver receives on wave band no 5, from 5,97 – 9, 00 Kc.

LO 6 K Scale lamp

The 12 volt lamp, for illuminating the frequency scale, just by lifting the cover. Also to see the handle for changing the wave band.

The case of the receiver.


This picture, I don’t know for sure, a Navy department, as a l istning station for the ships or Uboats abroad.  Varous receivers to be seen,


Unknown picture of the LO6K39. Maybe the Labor of the manufacturer, C. Lorenz AG in Berlin Tempelhof?  Hope someone can tell me. Pse your re. in  the comment below in this post.

NH 96462

Another rare picture of the LO6K39, in de radio room B (FunkraumB) on board the warship Prinz Eugen.  Just in the mid a contoll unit, for interfacing with the transmitter.

Finally some pictures of the replacement  of the contact fingers at the drum. Some  were broken. To do this, I had to dismantle the drum from the chassis. First dismantle the front, then unsolder the wirement of the radiotubes, the components and coils.

foto voorpagina

This was the receiver, where the contact fingers at the coil drum were broken. In beautiful condition, but not functioning.

To solve the problem,  I soldered new contacts from spare relais at the fingers. Then checked them in making contact with the drum contacts and rewired.  Put the whole thing together again, all bands were functioning again.

But it lookes all easy, but it was quit a job.

foto 1

Picture after removing the frontpanel. What a beautiful construction.

foto 4

Below the drum.



foto 3


The tuning capaciters, screening removed. Note in the mid, the potentiometer, which keeps the gain constantly over the whole range.



foto 2.

The removed  drum.

foto 6

Tuning capaciters removed, to acces the wiring.

dfoto 8

The new soldered contacts.

After the the project, I saw an advertisement on EBAY, of complete new contact fingers. A pity, I could buy  them not before. But maybe in future I will put them into the receiver.

foto 10

The new contact fingers.


KWEa Short wave receiver

“Kurzwellen Empfanger a (Anton)”


  • This receiver was in use by the “Wehrmacht”, especialy in radio vehicles.
  • This KWEa is an early type of 1941 and in fully working condition.
  • It has 11 tubes of the type RV2P800.
  • Frequency range: 980-1020 Kc in 5 bands.


A view inside the receiver. Very well visible are the tubes RV2P800 in there sockets. Right is shown the 2 gasfilled bulbs for protecting the HF-input. Very high voltages due to lightning in heavy thunderstorms are fed back then through them to earth. The various coil sets for the several frequency bands above right are turned around  via a kind of “Maltheser Kreuz” principle. When it begins turning, the contacts are lifted (open contacts), then the coil set turnes to its position, stops turning and after that  the contacts are closing again. In this way the contacts are kept pure and clean.

Below some other pictures of the beautiful receiver from the inside on the testbank.

KWEa front 1

Front inside with front removed, watch the beautiful wave lenght scale.At the left the pushbuttond for rading the correct currents of each tube, and the low tension voltage of 2 volts, the high voltage of the powersupply.


Medium wave stage upside at the left. Just in the lower mid the test voltmeter.

KWEa testbank 2

Testing the voltages of the different stages.

Frequency scale dial

The beautiful frequency band scale. Each band a different color.


 Charging generator GL.ERZ400 b

battery charger

ERZ front


The “GL. ERZ b” generator delivers 12 to 16 volts by 400 watts . This a very beautiful collectors item.

It was made by the manufacture  Auto Union, who was also the manufacturer of the well known auto autocar Auto Union, used by the Wehrmacht.

It was often placed in the turret of the german tanks like Panter and Tiger. Also seen in armoured car vehicle  “Panzer Spahwagen”, with the radio “Funksprech F” in it. It was ment to use it for charging the batteries, when the batteries of them were almost discharged.

Because of the high powerconsumption of the transmitters/receivers used inside of a tank, this happens sometimes, when the motor was not running. Batteries were sometimes too weak for starting the motor.To let the tankmotors running, the fuel consumption was high and also the noise of the motors. The generator was in that case, placed outside the tank and placed back in the turret, when not in use.. The generator did not make so much noise.

At the front was also a connection on it for direct feeding the radio’s in other situations.

ERZ side view

Here a side view of the generator.

ERZ side view 2

Another side view.

Erz handleiding

“Bedienungsanweisung” generator.



The Funksprech F is a transmitter/receiver for use in armourned car vehicles. For example the Panzerspah wagen.



My Fusprech F.

Fusprech F overview

Left below in the picture  the headphones type DFH-b, at the left below the throat microphone..

Frontcover Fusprech.

The inside of the frontcover with an overview of the installation. Just click at the picture to enlarge and seeing it.

Russland, Funker in gepanzertem Fahrzeug

A radio operator controlling the radio in a armoured car, a “Panzer Spah Wagen”, in Russia during WW2. Probable, seeing  to the second person, there  an attack with mortar  in the neighbourhood?  Watch also the mark on  at his uniform of the left person ,telling us, he was a radio operator,  or called “Funker”.

Stern Antenna.

This antenna was very often in use in radio vehicles of the German Army. There were more types of them, some smaller ones, used on tanks.

I did use the antenna once, to see how the results were. I putted it on an isolated mast at a height of 4 m above the ground and managed to match it to my modern transciever by means of a 4 meter single  feeder to  a little tuner. Only in the 15 meter amateurband it was possible. AT good propagations I manage to work amateurs through all Europe. Only the principle of functioning is not all clear to me.

I think it is a toploaded vertical. Only the vertical part, being the 4 meter feeder to the tuner , is radiating?  The “Stern”is only a toploading or top capacity for a better matching?  Or is the “Stern” also radiating in a horizontal way. For me an open question.

Origina,l the antenna was ment to have a good  range and signal strenght  at nearby. Not suitable for skywave transmissions.

But my experience was quite different, just suitable for skywave.

Maybe someone can tell me. I only got an explanation of the principle in the books about Russian radio after the war. (Gunther Fietsch).

Stern antenna

The Stern Antenna in use in the back of my garden. Just below in the picture the 4 meter feeder wire to the tuner.

RPG4 tube-tester

RPG4 tube-Tester.

This german  tubetester is all original. It is a very handy tester for testing the tubes in my german radio’s. It is remarkeble, that even a lot of  american tubes can be tested. So a very useful tubetester.


Picture Above: RPG4 Front View.

In the lid, there is a cable, which you can connect to tubetester itselves. So alle the tube testscockets in the lid comes available.


Picture above: RPG4 inside look.

Right the rectifier tube, left the voltage stabiliser tube,