saba: Meersburg W4 - Funktion of Knobs

My apologies for the incorrect model designation in the Title
The FM unit is installed in the Meersburg W according to the rear panel

Reviewing the schematic for the model 840-780a (dated 6.6.50) and presumably for radios produced in 1950/51, I have not completely understood the function of the right front knob and the lower right rear knob on the side of the radio.
I believe the use and function of the lower right rear knob is the same as that of the Saba S455WK that I have.

I believed the right front knob, however, is used to select the Mode of Operation as follows:

with 5 possible selections, I estimated the Modes to be---
1. TA only
2. All except UKW operation
3. UKW only
4. UKW muting
5. Sensitivity selection (weak or strong) and EM4 circuitry correlation

I realize there were many issues being resolved, after the Copenhagen convention, and improvements to reduce interferences and allow for interstation suppression of "excess noise". The use of the EQ80 FM discriminator (the phase detectors) appears to be somewhat brief in FM circuit developments, and also possibly added to the earliest models to reduce the number of tubes in the radio.

I would be most appreciative to determine the proper use and function of these knobs.

Respectfully,
Robert

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Dear Robert,

first i wasn't shure to reply to Your Question.

I descided to post the reply under The "Meersburg W", because this is the Model, to which the Question is, as far as i underrstood.

Please have a look there.

Regards,

Henning

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Dear Henning,

Thank you so very much.

My confusion stems from the fact that the FM tuner has the paper tag still attached and it appears as though it may be from the 1953 year for production. Also, it could easily have been installed after production.

I shall review your reply there.

Respectfully,
Robert

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