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Konzertgerät 6099

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Konzertgerät 6099; Grundig Radio- (ID = 11802) Radio
Grundig Radio-: Konzertgerät 6099 [Radio] ID = 11802 934x700
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For model Konzertgerät 6099, Grundig (Radio-Vertrieb, RVF, Radiowerke)
Country:  Germany
Manufacturer / Brand:  Grundig (Radio-Vertrieb, RVF, Radiowerke)
alternative name
Grundig Portugal || Grundig USA / Lextronix
Year: 1958/1959 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 12: EC92 EC92 ECH81 EF89 EM84 EBF89 EF80 EAA91 ECC83 ECC82 EL84 EL84
Semiconductors (the count is only for transistors) OA70 B250C150
Main principle Superheterodyne (common); ZF/IF 460/10700 kHz
Tuned circuits 8 AM circuit(s)     14 FM circuit(s)
Wave bands Broadcast, Long Wave, Short Wave plus FM or UHF.
Power type and voltage Alternating Current supply (AC) / 110; 125; 220 Volt
Loudspeaker 4 Loudspeakers
Power out
from Model: Konzertgerät 6099 - Grundig Radio-Vertrieb, RVF,
Material Wooden case
Shape Tablemodel with Push Buttons.
Dimensions (WHD) 710 x 430 x 320 mm / 28 x 16.9 x 12.6 inch

Grundig Wunschklang - Register.
Drehbare Ferritantenne. 5 Tasten und 5 Seilzüge für UKW. AFC. Mit Dynamik-Expander (funktioniert mit Glühlampe).

Net weight (2.2 lb = 1 kg) 17.6 kg / 38 lb 12.3 oz (38.767 lb)
Price in first year of sale 598.00 DM
External source of data Erb
Source of data HdB d.Rdf-& Ferns-GrH 1958/59
Literature/Schematics (1) -- Original-techn. papers.

All listed radios etc. from Grundig (Radio-Vertrieb, RVF, Radiowerke)
Here you find 6070 models, 5290 with images and 4088 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
Grundig Radio-: Konzertgerät 6099
Threads: 3 | Posts: 8
Hits: 2413     Replies: 1
grundig: 6099; Konzertgerät
Antoni Regeling



A while back I started to restore a Grundig 6099 that was in pretty deplorable state when I got it. Not only had it been stored in a damp environment for a long time but it also had physical damage: cracked cabinet including plastic surround etc. Anyway I'm now at the point where the cabinet has been restored (glued back together, refinished etc.), the chassis has been recapped etc. and the radio is working again, on FM and AM, so I'm now at the point where I have to iron out the remaining wrinkles.

One of the problems I'm dealing with is FM tuning range. It should be from 88 to 100 Mhz but presently the tuning range is from 80 to 92 Mhz, albeit that stations in that range come in loud and clear. My conclusion would be that the oscillator frequency is off, correct? I know that there are adjustable coils on the FM head but my experience with other radios has been that the range of adjustment using those normally is < 5 Mhz, and I'm off 8 Mhz or so.

My question is: what components control the FM oscillator frequency and what should I be checking? I do have the schematics but I guess I'm not experienced enough to really tell what the oscillator's main components are.

Another problem is with the amplifier section. Sound is loud and clear without any distortion for 30 minutes or so, regardless of volume and then there will be a series of loud cracks and plops for a minute or so, followed by another period with it playing perfectly. It does this both when playing FM stations and also when I have an iPod hooked up to the TA input, which is why I believe the problem is in the amp section. What are likely causes for this? Right now I'm cleaning all tube socket contacts - any other suggestions?

Lastly, what is the best way to temporarily disable the automatic tuning adjust? It's a great feature for normal use but it's annoying when trying to troubleshoot the radio.

Best regards,

Ton Regeling


Antoni Regeling


Hello all,

A follow up on my previous message: I found what caused the cracks and plops. It was a bad ECC82. I found it by gently tapping each tube with a pen with the radio playing - and when touching the ECC82 there were lots of cracks and plops. Replacing the tube cured the problem.

I also found the problem with the tuning range being very far off. The wire that pulls the core through the one of the chokes (coils) on the FM head got itself tangled up in one of the springs on the metal bar that pulls the core back and forth. Untangling the wire and cleaning the choke and core (it didn't slide freely) solved that problem.

The only problems that remain are that the entire mechanism for the FM preselect buttons is badly rusted, so the bar that pulls the cores through the chokes in the FM head doesn't move freely, so you have to help it when searching for radio stations. Any ideas here are greatly appreciated. The other problem is that the plastic pinion gears that drive the dial indicators are worn to the point that they no longer catch, making the dial indicators useless. If anyone has these, I'm very interested.

Otherwise this radio now plays great, with a fantastic sound quality, despite the rusty speaker frames and radio chassis.

Best regards,

Ton Regeling

Hits: 2700     Replies: 4
grundig: 6099; Konzertgerät - "Dezent" control
Bill Liers



I am presently working on restoring this fine Grundig radio. However, one of the controls is unfamiliar to me. I have translated the term "dezent" as "discrete" and see the corresponding function in the schematic as a mid to high frequency rolloff.

Would someone please describe the intention of this control for me?

Thank you,

Bill Liers

Markus Schumacher

Hello Bill,

the original manual shows the poor information (translated): "If you hear (music) in the late evening, press the button "Dezent".

This button is a gadget to decrease the volume/sound by pressing only one key (during night time or incoming telephone call ??), you don't have to use the loudness potentiometer.

I can provide you with a scan of the German manual, if you wish.

Knut Rothstein

Dear Bill

I don't know your Grundig radio. But, I mean the correct translation of the German "Dezent" should be "decent" in this case.

Another German term for "dezent" is "unaufdringlich" which describes the function you derived from the schematic very well. "Unostentatious" is one translation of the German "unaufdringlich".

With a high frequency rolloff you may find the sound of the radio less ostentatious.

Kind regards

Knut Rothstein


Bill Liers


Thank you for the clarification. I would of course, like to have a scan of the manual when you have the time.

Regards, Bill

Bill Liers



Thank you for your input. As I take another look at the schematic, I see that this control seems to connect only a simple RC to ground (the "B" section of the switch seems to be unused). So this is not simply a function of attenuation. Although when pushed the volume drops a good 6 dB but not so much of course at the low frequencies.

Dezent translated to Discrete possibly allows the user some Discretion as the listening situation changes, possibly for a phone call etc. without changing other controls? This would agree with your assessment, although It is a curious function to say the least.




Hits: 4186     Replies: 0
grundig: 6099; Konzertgerät
Eckhard Kull
  1 Der nachfolgende Artikel über die Senderwahltasten für 5 UKW-Programme beim RF-Gerät 6099 ist den Technischen Informationen, Heft 4/1958 der Firma Grundig entnommen. 


Grundig Radio-: Konzertgerät 6099
End of forum contributions about this model