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Freudenstadt 8

Freudenstadt 8; SABA; Villingen (ID = 10463) Radio
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Freudenstadt 8; SABA; Villingen (ID = 2102456) Radio Freudenstadt 8; SABA; Villingen (ID = 2102457) Radio
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Freudenstadt 8; SABA; Villingen (ID = 2102456) Radio
SABA; Villingen: Freudenstadt 8 [Radio] ID = 2102456 1400x941
Select picture or schematic to display from thumbnails on the right and click for download.
For model Freudenstadt 8, SABA; Villingen
Country:  Germany
Manufacturer / Brand:  SABA; Villingen
Schwer & Söhne, GmbH
Year: 1957–1959 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 7: EC92 EC92 ECH81 EBF89 EM84 EABC80 EL84
Semiconductors (the count is only for transistors) B250C100
Main principle Superheterodyne (common); ZF/IF 460/6750 kHz; 2 AF stage(s)
Tuned circuits 6 AM circuit(s)     9 FM circuit(s)
Wave bands Broadcast, Long Wave, Short Wave plus FM or UHF.
Power type and voltage Alternating Current supply (AC) / 110; 130; 155; 185; 220 Volt
Loudspeaker 4 Loudspeakers
Power out 4 W (unknown quality)
from Model: Freudenstadt 8 - SABA; Villingen
Material Wooden case
Shape Tablemodel with Push Buttons.
Dimensions (WHD) 615 x 390 x 280 mm / 24.2 x 15.4 x 11 inch
Notes dreh- und abschaltbare Ferritantenne.
Net weight (2.2 lb = 1 kg) 14.3 kg / 31 lb 8 oz (31.498 lb)
Price in first year of sale 409.00 DM
External source of data Erb
Source of data HdB d.Rdf-& Ferns-GrH 1957/58

All listed radios etc. from SABA; Villingen
Here you find 1614 models, 1457 with images and 1115 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
SABA; Villingen: Freudenstadt 8
Threads: 5 | Posts: 20
Hits: 3122     Replies: 0
saba: Freudenstadt 8 : Fehler im Schaltplan
Ottmar Lauth

Der Wert des im Schaltplan mit C 63 bezeichneten Kondensators wird fälschlicherweise mit 5 nF angegeben. Richtig muß es heißen : 25 nF.

Hits: 6040     Replies: 15
SABA Freudenstadt 8
Håkan Olsson

This is my first post on this forum...

I´m restoring a SABA Freudenstadt 8. I have put up some pictures on my websait:

The radio sounds great on UKV. The sound is excellent and crystal clear and it seems quite sensitive.

The only remaining problem to solve is the distorted sound on the Medium Wave Band. The radio seems quite sensitive but the signals I receive sounds like they are overloaded and not very pleasant to listen to. I have tried changing the tubes, but that did not help the matter.

Does anyone of you have any ideas of what might be the problem, and how to solve it?


Hans M. Knoll

Hallo Håkan.

Welcome here

It looks, as if your radio would not have any AGC. Maybe the IF- Stage is overloadet.

Can you measure a DC- Voltage with a tube voltmeter on three places?
Receive a strong station on Medium- or Long- Wave and measures by the point „R“ and „D“   of the SABA „Messbuchse“   and by the connecting point between C 45 with R27, all Values to Ground. Name the three values here in RMorg.
Regards Hans





Håkan Olsson

Hello Hans!


Thanks for taken an intrest in my little problem!


While receiving a strong station:

Messbuchsen R: 2 volt

Messbuchsen D: 25 volt

Between C45 and R27: 35 volt


 just removed empty frame  Martin

Hans M. Knoll

Hallo Håkan.

I see, i am on the right way! The ECH81 has no or verry low AGC Voltage.

Some condensors and resistors take part on this failure. 

And maybe Tube 4 EABC80.Tomorro i post a Detailet Diagramm with instructions what postition is to observe.



Håkan Olsson

Thanks Hans!

I do not think it is the EABC80. I have used two of them, both NOS-tubes.

Looking forward in hearing from you!


Hans M. Knoll

Hallo Håkan.

The SABA device „Freudernberg 8) uses the Philips technique of the 3 diode switching AGC (delayed AGC)
The AGC becomes a delay in order to get a good search funktion an AM. A negative Bias-Voltage ( ~ .2volts) is used before AGC works (is in funktion) .
I marked components which can cause a failure, she has a red marking.
 The third Diode is the Audio_Signaldiode (EBF89) Pin 8  not show!
First the three papers and the 10pF keramics and then the two 1,6 Meg Resistors must bee checked.
From SABA point ( R ) to ground, must at minimum an resistance 4 Megohms, ore more, exist. measured with resistancemeter.
I hoppe that’s brings an Result.
Håkan Olsson

Thanks for your effort Hans!



Between point R and ground I have 180 kiloohms.

I will check the specific components later today.



Hans M. Knoll

 Hallo Håkan


It seems, there is a shorting to the ground left of R1 200 Kohms,  .180 and 200 nearly the same.

Your 180 say that to mee, maybe???

Please look there. See new diagramm.V2


Håkan Olsson

I can not say that I have found what is wrong, but me poking around in the radio have resulted in that the resistance between messbuchse R and ground now is 2.57 Mohm.

May be the sound has improved a little bit...


Håkan Olsson

One observation...

Below the 10M resistor (that is between R65 and R68) there should be -12,5 volt on AM.

I have only 11 volts.

Is that significant?



Hans M. Knoll


Hallo Håkan.
An opinion, from where the 2,57Meg come now, is not to be expressed me possibly.
Dit you worked with spray (Kontakt 60) etc.? Then that is clear. Residues of that are electrical conductors.
You had promised to examine the components „rot. What is in this way?
In addition it is always necessary if changes turn out suddenly that what it was before to check new. In This Case, the measurements at the points in Posting 3
I wait.
The measurement 12,5 V DC according to plan is an average no required value. The Difference of 12,5 to 11 volts does not have any influence on the problem here.
The Bias voltage is responsible only for weak Signal. To the divider (10 Meg// 1,6Meg) those ones are 1,72 to 1,51 volts, to look therefore uncritically.
Håkan Olsson

Dear Hans,

I think I have found what was wrong. I remembered that I have read somewhere a while ago about the MF-filters and distortion.

After I replaced C31 and C32 in Fi.2 with NPO-capacitors everything is okay and the sound on Medium Wave is normal and clear. Obviously the old capacitors were (or had become with age) current dependent causing them in fact to "modulate" the signal in tune with the AGC-current.

I do not know, but did they not use to modulate the transmitters less than is the custom nowadays? Perhaps the radio was quite all right when it was produced, perhaps it is the "over-modulation" today that is causing the problem....


Konrad Birkner † 12.08.2014

Dear Hakan,

Congratulations for the successful repair. Nevertheless I think there is still a remaining fault in the AVC circuitry. The distortion may have gone, but the full performance is certainly not yet recovered.

H.Knoll has clearly analysed and depicted where and why the 2 Volts are not correct.
Being myself an experienced Engineer I am always amazed how thoughtful and skilled H.Knoll is going to assist.

I can understand Your pride, but between the lines one could also read "blame, You got the wrong track". And I could understand if he would lose his motivation. He has not deserved that, by no means.

I hope You may understand my open words. But I hate the idea to lose H.Knolls cooperation.


Ernst Erb

Here is the message from Mr. Olsson the language member admin received:

Please remove me from the membership list of Radiomuseum!

Håkan Olsson

I naturally did immediately what he asks for. Such a reaction is typical for certain persons who never will be "growing"/prospering because of their wrong pride. They stay "halfsighted" and are not really desirable members.

Konrad did gratulate him for having found an other problem and told him where the real problem still lies if he measured such a low AGC voltage. He also told WHY his answer may lead many readers to the wrong conclusion that HMK was wrong, but Hans M. Knoll outlined very clearly the primary problem - with quite some research and personal work which enables many others to understand how the delayed AGC is coming to birth.

In post 12 Mr. Olsson looses his way which can only mean that he does not understand why the found problem has to be solved. This can happen. With his measures, which might also have been necessary in a second step, he has a working set which works much below it's possibilities and some parts will not be pleased to get such a lot of current, working strong stations. Mr. Olsson is not aware of this problem and blames the transmitters ;-)

He could have gone on and do those few measurements ... and post differently. He might have found out that HMK is one of the most gifted radio engineers who has electrically designed just such radios for more than two dacedes! We all can learn a lot from his outlinings he does, even struggeling in a foreign langauge to help somebody.

For the end I show you an example how a positive thread might occur. I don't know if members can understand how much work it is to go this way of methodically and professionally find the way to help.

Omer Suleimanagich

Thank you Hans, and thank you all for maintaining and contributing to this amazing site!

Even though, there might have been a communication issue from this new/past member, please archive this thread for future use.

Han's help and contribution is invaluable to this site!

Thank you Konrad and Ernest, for keeping clarity and civilty, more is learned on RMorg than any textbook out there that I've seen to date.

Hans M. Knoll


Hello Omer.
Thanks for your opinion on the forum and this process.
Greeting to Calif. Hans
Hits: 3546     Replies: 0
saba: Freudenstadt 8 Tastensatz-Zierleiste
Georg Kniffki † 2015
  1 Sehr oft sind die breiten Tastensatz-Zierleisten - auch vieler anderer Saba-Modelle - durch Abrieb unansehnlich geworden. Ich habe sehr gute Erfahrungen mit nachstehendem Arbeitsablauf gemacht: Leiste ausbauen und innerhalb des sichtbaren Bereiches anschleifen, danach mit Presto Spritz-Spachtel grundieren. Danach mit "belton" Spezial Gold-Effekt-Sprühlack lackieren, zum Abschluß mit Klarlack auf Acrylbasis lackieren. Obwohl auf der Gold-Spray Dose der Hinweis steht, daß der Lack nicht weiter mit Klarlack lackiert werden soll, ist der Erfolg sehr gut. Der Lack ist absolut abriebfest und ist vom original Saba-Lack kaum zu unterscheiden. Alle drei Spraydosen sind bei Obi erhältlich.
Georg Kniffki
Hits: 2580     Replies: 0
saba: 8; Freudenstadt UKW-Tuner Induktive Abstimmung d
Andreas Reuther

Hallo an alle,

ich habe folgendes Problem. Beim Transport meines schönen SABA Freudenstadt8 ist der Glasstab gebrochen, der im UKW-Tuner die drei Abstimmkerne für die induktive Abstimmung trägt - unreparabel, da in mehrere Teile zerfallen. Hat jemand im Forum eventuell einen Tuner aus einem Schrottchassis oder den Stab aus dem Tuner, den er mir abgeben könnte? Oder hat jemand einen Tip zur Reparatur? Wie bekommt man die konischen Abstimmhülsen vom defekten Glasstab? Zur Not, wenn man die Abstimmhülsen zerstörungsfrei gewinnen könnnte, wäre ein Neuaufbau auf einem geeigneten Stab (Glas oder Calit 4mm Durchmesser) denkbar) Für jede Hilfe dankbar.

Gruß Andreas Reuther

Vielen Dank an all die freundlichen Hilfsangebote. Dank Ihrer Hilfe  funktioniert der Tuner wieder einwandfrei.

Hits: 2032     Replies: 0
saba: 8; Freudenstadt: Tasten gebrochen
H. P.

Hallo zusammen,

an meinem Saba Freudenstadt 8 ist mir dieser Tage die KW-Taste gebrochen. Eigentlich kein Wunder bei dieser Konstruktion. Die Tasten haben (von hinten gesehen) einen "Zwischenboden" auf den bei Tastendruck der aus dem Tastenaggregat ragende Stift drückt. Dieser "Zwischenboden" ist fragil und nach fast 50 Jahren eben brüchig. Im Vergleich zu den Tasten von Grundig oder Graetz ist das eine Fehlkonstruktion, finde ich.

Für das, was ich gemacht habe, werden mich die Puristen jetzt steinigen, aber da ich keine Reservetasten und auch kein Schlachtgerät mit heilen Tasten hatte, habe ich die Heißklebepistole genommen, die Taste randvoll mit dem klebrigen Zeug gefüllt (Vorsicht: Taste wird knallheiß !), 3 Minuten bis fast zum Erkalten gewartet und die Taste dann auf den Stift gedrückt und gerichtet.

Bei einem Gerät mit hinterleuchteten Tasten geht das wahrscheinlich nicht, was gibt es an besseren Methoden ?


Holger Pflug 

SABA; Villingen: Freudenstadt 8
End of forum contributions about this model