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CR9 ; Grebe, A.H. & Co.; (ID = 232112) Radio
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CR9 ; Grebe, A.H. & Co.; (ID = 2368237) Radio
Grebe, A.H. & Co.;: CR9 [Radio] ID = 2368237 1400x763
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For model CR9, Grebe, A.H. & Co.; Richmond Hill (NY):
Collection privée (réf. 0097)
Country:  United States of America (USA)
Manufacturer / Brand:  Grebe, A.H. & Co.; Richmond Hill (NY)
Year: 1921 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 3: C300 C301 C301
Main principle TRF with regeneration
Wave bands Broadcast (MW) and Long Wave.
Power type and voltage Storage and/or dry batteries
Loudspeaker - For headphones or amp.
Power out
from Model: CR9 - Grebe, A.H. & Co.; Richmond
Material Wooden case
Shape Tablemodel, Box - most often with Lid (NOT slant panel).
Dimensions (WHD) 22.2 x 7.25 x 8.5 mm / 0.9 x 0.3 x 0.3 inch

Tuning capacitor 40 - 510 pF;
plate coupling coil 165 µH;
tuning coil taps:
80 - 185 - 440 - 880 - 1610 - 2500 - 3800 - 5000 - 6780 - 8200 µH.
In 1923 other tubes were recommended: C300 C301A C301A for storage battery or 3xC299 for dry battery operation (Andrae catalog).

Price in first year of sale 130.00 $
External source of data Ernst Erb
Source of data Radio Collector`s Guide 1921-1932
Circuit diagram reference Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
Mentioned in The Radio Collector's Directory and Price Guide 1921 - 1965 (Andrae Catalog R-6 (1923))
Literature/Schematics (1) Radio Manufacturers of the 1920's, Vol. 2
Literature/Schematics (3) Le Guide du Collectionneur TSF Biraud/Foster, Vol. I (page 196)

All listed radios etc. from Grebe, A.H. & Co.; Richmond Hill (NY)
Here you find 186 models, 115 with images and 59 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
Grebe, A.H. & Co.;: CR9
Threads: 2 | Posts: 6
Hits: 1918     Replies: 4
grebe: CR9
Dino DiBernardo

I am restoring a Grebe CR-9. Does the unit require an external detector and amp to operate? I tried to connect the filament voltage and detecter / amp voltages to the terminals but i am not getting anything from the speaker. In fact the tubes are not even powered.

Have anyone successful fired up a Grebe CR-9?

Dietmar Rudolph

Dear Dino,

could you please specify which type of speaker you used? Preferably, this should be a high impedance type, say 2000 Ohms or even more.

If a low impedance speaker (e.g. 4 Ω)  is used, virtually nothing will be heared.

Did you check the tubes already? Even if the output tube drains a few mA only, this will be sufficient for a high impedance speaker. The anode current of the output tube can be measured directly if a meter is connected to the loud speaker posts.

If you can't measure an anode current, try the switch contacts of the 2nd stage. Are they clean?

You also can check the 2nd tube in the same way if it is plugged into the output stage.

If you can measure anode currents, you may touch the grid pin. Then a sratch and/or a hum will be heared with an appropriate speaker (or in a high impedance headphone).

Also the AF transformers should be checked with an Ohmmeter. Sometimes, old transformers suffer from interruptions of their coils (mostly near to their posts).



Dino DiBernardo

I managed to get the unit to work. I always use a high impedance speaker. the output transformer was bad but i had already replaced that. The issue was the CR-9 unit needs you to plug into the 2nd stage headphone jacks with a special plug. i used a stereo headphone plug and got the unit to work!

Thanks for your help though!

Konrad Birkner † 12.08.2014

Any ¼" standard phone plug will do the job, regardless if mono or stereo type, to connect the speaker terminals to the output stage.

There is no output transformer, so one of the two interstage transformers must have been defect. Open secondary, I guess?


Dino DiBernardo

Thanks for the reply, yes the second interstage transformer had a open primary.  all is good. Thanks again.

Hits: 1895     Replies: 0
grebe: CR9;
Konrad Birkner † 12.08.2014
  1 Baujahr: ab Aug.1921 (Douglas: Radio Manuf.of the 20s); Maße: 570 / 180 / 220 ; Röhren: UV200 or 201 / UV201 / UV201 , kurze Bauart ! (sonst sitzt der Deckel auf den "Spitzli"auf!); 
Grebe, A.H. & Co.;: CR9
End of forum contributions about this model