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Gavotte 9U Licensed by Armstrong

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Gavotte 9U; Telefunken (ID = 105173) Radio
Telefunken: Gavotte 9U [Radio] ID = 105173 933x647
Select picture or schematic to display from thumbnails on the right and click for download.
For model Gavotte 9U Licensed by Armstrong, Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH:
US-Ausführung ; Sammlung Dale Steel, Ridgeland, Mississippi, USA
 
Country:  Germany
Manufacturer / Brand:  Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Year: 1958/1959 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 6: ECC85 ECH81 EF89 EABC80 EM80 EL84
schematic requested
Main principle Superheterodyne (common); ZF/IF 460/10700 kHz; Export model
Tuned circuits 6 AM circuit(s)     10 FM circuit(s)
Wave bands Broadcast, Long Wave, Short Wave plus FM or UHF.
Details
Power type and voltage Alternating Current supply (AC) / 110-240 Volt
Loudspeaker 3 Loudspeakers
Power out
from Radiomuseum.org Model: Gavotte 9U [Licensed by Armstrong] - Telefunken Deutschland TFK,
Material Wooden case
Shape Tablemodel with Push Buttons.
Dimensions (WHD) 460 x 300 x 200 mm / 18.1 x 11.8 x 7.9 inch
Notes

This Gavotte 9U is the export version (for the USA) of Gavotte 9. Gavotte 9 has no short waves.

Net weight (2.2 lb = 1 kg) 8.2 kg / 18 lb 1 oz (18.062 lb)
External source of data Dennis Daly

Model page created by Ernst Erb. See "Data change" for further contributors.



All listed radios etc. from Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Here you find 3460 models, 3030 with images and 2006 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



 


Forum contributions about this model
Telefunken: Gavotte 9U
Threads: 1 | Posts: 5
Hits: 1976     Replies: 4
telefunken: 9U (Export f. USA); Gavotte
Charles Jones
18.Nov.09
  1

hello all. i just acquired a nice telefunken gavotte 9u which powered up safely, but would not hold any fm (ukw) station without unpleasant static sibilance. this went away when i replaced the EABC80 detector valve, and i got the customary "big" gavotte sound. however, lately i'm getting a very loud hum (no station signal) when i power it up. once, while listening to a station, it reverted to this loud hum and i had to power down. what is the likely cause of such a noise? thank you.

Emilio Ciardiello
18.Nov.09
  2

Dear Charles,

try to replace the selenium bridge rectifier with a silicon bridge.

Best wishes, Emilio

Todd Stackhouse
19.Nov.09
  3

...Along with Emilio, I will entertain the possibility of something having gone amiss with the rectifier causing the loud hum. But the greater possibility by far is that one or both of the HT (or, to us Americans, B+) filtering capacitors have failed. 

...I have a schematic for an Opus 7U (probably very similar, but a slightly older model).  It shows two of these filter capacitors: two 50µF electrolytics; the first comes right off the output of the rectifier, then there is a choke, then the second one.  Most likely these are in a two-section 'can' which will probably be labelled something like '50+50µF 385V'.  These are always the 'prime suspect' in cases of loud hum in radios, especially as radios get older (electrolytics, especially those designed for high voltages, do not age well.)  In radios of this age (in your case, about 50 years), most restorers will replace these straightway as a matter of course.  Old electrolytics can also quickly progress from merely causing a loud hum to catastrophic failure (they have been known to explode), which can make quite a mess of the insides of the radio and turn a relatively easy repair into a nightmare.

...The first thing you should do is to replace those electrolytics before you try to power up the radio again.  If you don't want to do away with the old 'can' (many people don't, to preserve an 'all-original' appearance), you have two options:

1.  Obtain two 47µF 450V electrolytics (which you need to do in any case).  Disconnect the wires from the 'can', one at a time, from wherever they are connected underneath the chassis.  After disconnecting each wire, connect the positive lead of one of your new 47µF caps to the terminal you removed the wire from, and connect the negative lead to the chassis.  (Alternatively, you can cut the wires close to where they come out of the 'can' and wire them to separate lugs on a terminal strip, then wire your new caps to that strip (one positive lead to each separate wire, the two negative leads to the chassis.)  This way your original 'can' is in its original place, but is completely removed from the circuit and the new caps are discreetly 'hidden' under the chassis.

2.  Try to 'restuff' the original 'can' (which involves somehow opening up the 'can', completely cleaning out the original contents, actually mounting your new caps inside the 'can', connecting the positive leads to the wires coming out of the can and the negative leads to the inside of the 'can', and finally resealing the 'can').  Many restorers have done this successfully using different techniques, but it is considerably more work, and somewhat delicate, and is usually not something for a beginner to try.  (It is also possible to 'restuff' the rectifier in a similar manner, if it is in the form of a black 'can' that mounts onto the chassis and is usually marked 'AEG'.)

...If you already know all of this, my apologies.  You appear to be relatively new here, and I don't know your level of expertise with radios/electronics. 

Charles Jones
25.Nov.09
  4

wow! thanks, emilio and todd, for your very helpful responses. todd, i will start with replacing the electrolytics, and i'll do it under the chassis, leaving the disconnected "cans" attached on top. that'll be a fun repair, and i look forward to finding if this will do the fix. it'll be awhile (the holidays) before i can report back on this. you've sure left very little room for error in this repair. thanks again for your very helpful responses. i'm very grateful.

--charles jones

colorado

 

Charles Jones
03.Dec.09
  5

i replaced the filter caps with new electrolytics under the chassis and powered the radio on safely, only to learn that the ECC85 preamp valve was blown. the AM (MW) and shortwave bands seemed fine, but i got no FM (UKW) reception. after replacing the tube, the radio played beautifully on all bands, and even the EM80 indicator valve burns brighter green. thanks again for your valuable assistance.

 
Telefunken: Gavotte 9U
End of forum contributions about this model

  
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