Since I just purchased this model, I am curious to know the frequency ranges on the LW and MW bands. The photos presented were not clear enough to identify the numbers on the dial glass.

Also, the schematic does not depict a lamp for the illumination of the dial - I presume there was no requirement to illuminate the dial in a dimly lit room.

Respectfully,
RoSa

To thank the Author because you find the post helpful or well done.

Hallo Mr. Sarbel

the later Model Marlofstein III (3) covers longwave from 700 to 2000 meters and mediumwave
from 200 to 600 meters.
I think in this short time differenz, the waveranges are the same.

Regards, Hans

To thank the Author because you find the post helpful or well done.

Hello Herr Knoll,

The radio and instruction brochure, and the wave lengths are as you stated. The original power cord and plug are still attached, and the voltage selector was still on the 220V AC setting.

I am hoping that only the few electrolytic capacitors may need replacing. I am presently making a 6-pin adapter to test the RV-series tubes. All filaments test positive for continuity, and speaker coil measures at 2.1 ohms - the fuse still maintains continuity.

Respectfully,
Robert
Photos have been approved by the administrators

To thank the Author because you find the post helpful or well done.

Dear Sir,

congratulation to your purchase  of a Siemens Marloffstein 1 receiver. Those radios are quite rare and show a very good performance due to the fact that professionall parts from Wehrmacht have been used. 
Radios from the time 1945 - 48 collectors in Germany call "Notradio" which is difficult to translate. "Not" = to suffer from everything.
At that time industry in Germany was destroyed and the engineers had the problem to design radios from scrab. At the end of the 30ies radio design has reached a certain level and construction of every radio shows a certain standard.
But now in the 40ies due to the shortage every radio design becomes individual depending on the material available. This makes such radios very interesting for the collector because they reflect the genius and ability of the engineers.
You say that some caps need replacement. Bearing in mind what I tried to explain I would suggest to be very careful to remove any parts from the radio because it will loose the ability to documentate the situation at that time at Siemens.
E.g. try to leave the caps mounted on one side in the radio and solder the new ones beside the old ones.

Best regards
Rüdiger Walz


 

To thank the Author because you find the post helpful or well done.

Guten abend Herr Walz,

When I saw the radio on ebaY, I had the firm belief that the radio must have GREAT significance. I agree that the Marloffstein will be maintained as close to original as possible.

I am positive the chassis has never been removed from the cabinet, because 3 of the 4 small brown rubber inserts were still glued to the bottom of the cabinet on top of the machine screws which secure the chassis to the cabinet. Also, the small brown rubber circlets which "cover" the set screws on the 3 original knobs are quite dry rotted, but intact. To loosen or remove the set screws, the rubber circlets will most likely be ruined.

I hope to be able to locate a suitable replacement, if any members have any information to assist me during the restoration effort. I would be most appreciative. I have seen in the supermarkets the small diameter, and wide rubber bands on some produce (however, they are bright red in color). . . .not an option!!

I will most definitely "disguise" replacement capacitors to ensure cosmetic integrity.

Thank you so very much for your words. And I also express gratitude to Herr Knoll for all of his support.

Mit Freundlichen Grüßen,
Robert Sarbell

To thank the Author because you find the post helpful or well done.

Hallo Mr. Sarbell,

congratulate to this famous Radio.
Marloffstein near Erlangen, is a small Village, only 50 Km from my hometown.

On this place here, i will give anny support, if you have questions to the electric.

Hans M. Knoll

To thank the Author because you find the post helpful or well done.

Hello Hans,

I aplogize for my alzheimer memory. . . I think in the early 1940s my uncle has a TRF-type radio with the feedback control. I can not recall the technique for accurate tuning; however, I must first ensure that the original electrolytic capacitors are replaced - although they appear to be "sealed".

Also a question regarding the "erde" connection - should have good ground point!

I am presently seeking at least a good used tube base to create a test adapter for my Hickok 752A to test the RV12P2000 tubes, even though the filaments have continuity.

Regards,
Robert

To thank the Author because you find the post helpful or well done.

Hello Mr. Sarbell,
may be you remember now?

 

This words are written  for Radio -Listeners  on short wave, called. SWL' s 

After the set is completed and the wiring checked to make sure that it is exactly as shown, insert the C coil in the coil socket and connect the headphones, antenna and ground, and the heater supply. After the heater supply has been connected for a few minutes, the tube should feel warm to the touch and there should be a. visible glow from the heater. The "B" battery may now be connected and the switch, S1 closed.

Now turn the regeneration condenser C2, starting from minimum capacity (plates all out) until the set goes into oscillation. This phenomenon is easily recognisable by a dis­tinct click, thud or hissing sound. The point where oscillation just begins is the most sensitive operating point at that particular dial setting.

The tuning dial may now be slowly turned, the regeneration control knob being varied simultaneously (if necessary) to keep the set just oscillating. A number of stations should be heard. A little practice will make tuning easy.

If the set refuses to oscillate, the sensitivity will be poor and no code signals will be heard on the frequencies at which such signals should be expected. It should oscillate easily, however, if the coils are made exactly as shown. It some­times happens that the antenna takes so much energy from the set that it cannot oscillate, this usually resulting in "holes" in the range where no signals can be picked up (and where the hissing sound cannot be obtained).

From ARRL Handbook 1944 page 211 copies from Hans M. Knoll

to the theme "ERDE" i will bring something tomorrow.

yes here please. Mr. Scott- Taggard says: 

regards H.M.Knoll

Attachments:

• Install a Radio (49 KB)

To thank the Author because you find the post helpful or well done.

Hello Herr Knoll,

Thank you so much for the reference, I did not become active enough in my earliest years to own or operate that type of receiver. I understood "some radios" could be controlled in such a way that it also functioned as a type of transmitter.

In the early years of my flight operations there was always a fully qualified radio operator aboard the aircraft, and most of the AN/ARC-xxx units had several control knobs.

Respectfully,
Robert

I respectfully request some assistance to determine if I have correctly translated the page 4 of the Marloffstein brochure - for my enlightenment and others

Below I add my translation, then the dubious Babelfish, and then the original text.
-----------------------------------------------------------------------------------------
III. English Text from RPS Translation

Operation of the receiver

For full utilization of the good reception characteristics of the equipment, it is necessary to proceed, during the following operations, exactly in accordance with the specific guidance.

The functions of the control knobs and switches on the front of the equipment are shown by fig. 2. After moving the Power switch (on the left) "ON" (upward), the equipment is ready to receive after approximately 1/2 minute. For the reception in the medium-wave band (about 200 to 600 m), the Wave Band switch (on the right) is provided to select the resonant frequencies on the tuning knob (the left knob) on the "middle wave" band (switch placed upward) and adjusted through the transmitters.

The following procedures apply for the upper half of the radio dial scale (M). With the reception of nearby strong transmitters (local stations), the rotary knob for the feedback (the middle) is turned to the left up to the stop, and the volume is regulated with the right rotary knob. With very slight adjustment of the feedback knob, the overall reception can be improved again slightly.

With weak reception, additional increase of the volume and station discrimination can be achieved through manual adjustments of the feedback knob slightly more to the right. The reception is then again fed back from the normal volume, and improved by rotating the volume knob while slight adjustment is made to the tuning and feedback knobs. The feedback knob may only be turned a short distance to the right (clockwise) before the whistling sound of the installed oscillator is heard. .

With long wave reception (approx. 700 to 2000 m), the wave band switch is placed to the L - "long wave"- position (downward), and the following procedures are accomplished. Note: Within the United States there are presently very few Long wave transmitters in operation; however, in certain areas, the receiver is capable of satisafactory reception of a few European transmitters under ideal conditions. When operating in the long wave band, the numbers 1 through 10 on the radio dial scale (L) apply. With particularly difficult reception conditions, an antiresonant circuit can be inserted into the 2-pin socket - in place of the jumper that is installed as internal equipment-(see figure 3). You can receive details pertaining to the anti-resonant circuit from your broadcast specialist, to whom you should also refer for proper servicing and replacement of the tubes.

Technical data
1. type designation - Marloffstein Single circuit, AC-DC receiver with installed permanent dynamic loudspeaker
2. Voltage/type of current - 110 and 220 V AC and 110 and 220 V DC
3. tube assembly - with alternating current 5XRV12P2000; with direct current 3XRV12P2000
4. safety device - Micro fuse 200 mA. . . 5 mm x 20 mm
SIEMENS AND HALSKE AG -- WERNER WORK -- ATTAINING




II. English Text from Babelfish Translation

Operation of the receiver

For the full utilization of the good receivings caracteristics of the equipment it is necessary to proceed during the operation exactly after the following guidance.

The functions of the control buttons and switches on the front of the equipment are shown by fig. 2. After surrounding the Power switch (the left) "ON" (upward) the equipment is ready to receive after approximately 1-2 minute. For the receipt in the medium-wave band (about 200 to 600 m) the Wave Band switch (the right) is provided to allow selection of transmitters by the co-ordination - or tuning - knob (the left knob) on "middle wave" (upward); and adjusted through transmitters.

The following procedures apply to the upper half of the scale (M). With the receipt close lying strong transmitter (short-distance transmitters) is turned to the left the rotary button for the feedback (the middle) up to the notice and the volume with the right rotary button is regulated. With the co-ordination button the attitude is again improved on that. With fern receipt through tricks of the feedback button an additional increase of the volume and the discrimination can be achieved to the right. The receipt is then in-regulated again from normal volume and improved pressing of the volume button at the co-ordination button the attitude. The feedback may only to short before using the whistler (Schwingungseinsatz)nach to be right turned.

With long wave receipt (approx. 700 to 2000 m) is to be proceeded in accordance with surrounding the wellenschalters on "long wave" (downward) in a general manner. Here then the lower half of the scale (L) applies. With particularly difficult receipt conditions an antiresonant circuit can be inserted into the sockets planned for it in place of the jumper used now (fig. 3) in the internal equipment. You receive details over it from your broadcast specialist, to who you leave also better that about necessarily becoming replacement of tubes.

Technical data
type designation Marloffstein encircling universal receiver with inserted p-m loudspeaker
tension type of current 110 and 220 V AC.........,110 and 220 V DC
tube assembly with alternating current 5XRV12P2000, with direct current 3XRV12P2000
safety device Micro fuseFeinseicherung 200 mA. . . 5 mm x 20 mm
SIEMENS AND HALSKE AG -- WERNER WORK -- ATTAINING


I German Text from Brochure

Bedienung des Empfängers

Zur vollen Ausnutzung der guten Empfangseigenschaften des Gerätes ist es erforderlich, bei der Bedienung genau nach der folgenden Anleitung vorzugehen.

Die Funktionen der Bedienungsknöpfe und Schalter auf der Vorderseite des Gerätes sind aus Bild 2 ersichtlich. Nach Umlegen des Netzschalters (der linke) auf Ein (nach oben) ist das Gerät nach etwa 1-2 Minute empfangsbereit. Für den Empfang im Mittelwellenbereich (etwa 200 bis 600 m) wird der Wellenschalter (der rechte) auf Mittel (nach oben) gestellt und durch Drehen des Abstimmknopfes (der linke Knopf) eine Sender eingestellt.

Dabei gilt die obere Hälfte der Skala (M). Beim Empfang nahe liegender starker Sender (Ortssender) wird der Drehknopf für die Rückkopplung (der mittlere) bis zum Anschlag nach links gedreht und die Lautstärke mit dem rechten Drehknopf geregelt. Hierauf wird mit dem Abstimmknopf die Einstellung nochmals verbessert.

Bei Farnempfang kann durch Drehen des Rückkopplungsknopfes nach rechts eine zusätzliche Erhöhung der Lautstärke und der Trennschärfe erreicht werden. Durch Betätigen des Lautstärkeknopfes wird der Empfang dann wieder aus normale Lautstärke eingeregelt und am Abstimmknopf die Einstellung verbessert. Die Rückkopplung darf nur bis kurz vor dem Einsetzen des Pfeiftones (Schwingungseinsatz)nach rechts gedreht werden.

Bei Langwellenempfang (ca. 700 bis 2000 m) ist nach Umlegen des Wellenschalters auf "Lang" (nach unten) sinngemäß zu verfahren. Herbei gilt dann die untere Hälfte der Skala (L).
Bei besonders schwierigen Empfangsverhältnissen kann an Stelle des jetzt eingesetzten Kurzschlußbügels (Bild 3) im innern des Gerätes ein Sperrkreis in die dafür vorgesehenen Buchsen eingesetzt werden. Näheres darüber erfahren Sie von Ihrem Rundfunkfachmann, dem Sie auch besser das etwa erforderlich werdende Auswechseln von Röhren überlassen.


Technische Daten
Typenbezeichnung Marloffstein Einkreis-Allstrom-Empfänger mit eingebautem p-m Lautsprecher
Spannung-Stromart 110 und 220 V AC..........110 und 220 V DC
Röhrenbestückung bei Wechselstrom 5XRV12P2000, bei Gleichstrom 3XRV12P2000
Sicherung Feinsicherung 200 mA. . . . .5 mm x 20 mm

SIEMENS UND HALSKE AG --- WERNERWERK --- ERLANGEN

To thank the Author because you find the post helpful or well done.

Hello Mr Knoll, Hell Mr Sarbell

i uploaded the original Siemens data and schematic for the Marloffstein (1). Hope it helps.

Kind regards, Walter Haring

To thank the Author because you find the post helpful or well done.

Hallo Herr Harring,

bin erfreut, wieder mal was von Ihnen zu hoeren.
 Dass Sie die Originale des Marloffstein 1 haben, ist die gleiche Sensation wie das Geraet in USA.
Man traeumt davon und das war's dann.

Vielen Dank,  auch im Namen von Mr. Sarbell.

Jetzt brauchen wir halt noch jemand der den deutschen Text aus der Anleitung ins englische uebersetzt. Meine Faehigkeiten  reichen da nicht aus!

Wobei ich der Meinung bin, dass die RPS Übersetzung schon recht gut ist.

Vielleicht bemüht sich jemand und ein Senior muss nicht Alles alleine machen.


Gruesse an Sie von Hans M. Knoll

To thank the Author because you find the post helpful or well done.

Hallo und Vielen Dank Herr Knoll und Herr Haring,

I am satisfied completely with your analysis, and I shall accept it as "authority" and I wait now for my set of 5 NEW tubes.

I wish to add one small item regarding the electrolytic capacitors on the chassis of my model. . . . .they have different ratings from the schematic that Herr Haring has just posted; and they are different from the schematic posted by Herrn Scharnhorst and Freudenberg.


The single unit is marked 2.0uF 160/240V; and there are 2 dual units marked as 2x0.5uF 160/240V - they have also the original Siemens logo marking.

Additionally, is it possible that the Model 1 from the data sheet posted by Mr Haring could be from a later version - I was expecting to see some date markings on the sheet. It appears as though there may have been additional printing on the bottom.

Respectfully,
Robert Sarbell

To thank the Author because you find the post helpful or well done.