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R1155; MILITARY U.K. (ID = 280253) Receiver-C R1155; MILITARY U.K. (ID = 280270) Receiver-C
R1155; MILITARY U.K. (ID = 280678) Receiver-C R1155; MILITARY U.K. (ID = 879609) Receiver-C
R1155; MILITARY U.K. (ID = 879610) Receiver-C R1155; MILITARY U.K. (ID = 879612) Receiver-C
R1155; MILITARY U.K. (ID = 879613) Receiver-C R1155; MILITARY U.K. (ID = 879614) Receiver-C
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R1155; MILITARY U.K. (ID = 280253) Receiver-C
MILITARY U.K.: R1155 [Receiver-C] ID = 280253 463x243
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For model R1155, MILITARY U.K. (different makers for same model)
Country:  Great Britain (UK)
Manufacturer / Brand:  MILITARY U.K. (different makers for same model)
Year: 1940–1945 Category: Commercial Receiver (may include amateur bands)
Valves / Tubes 10: VR99A VR99A VR100 VR99 VR100 VR100 VR101 VR101 VR102 Vi103
Main principle Super-Heterodyne (Super in general); ZF/IF 560 kHz
Wave bands Wave Bands given in the notes.
Power type and voltage Other, details in remarks or not known.
Loudspeaker - For headphones or amp.
Power out
from Model: R1155 - MILITARY U.K. different makers
Material Metal case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 16.4 x 11.4 x 9.4 inch / 417 x 290 x 239 mm
Notes 75 kHz to 18.5 MHz in 5 bands; with D/F (Direction Finding) and homing functions. There are several different versions known. External power supply: HT 220V 75mA, LT 6,3V 4A. Aluminium case.
Net weight (2.2 lb = 1 kg) 11.8 kg / 25 lb 15.9 oz (25.991 lb)
Source of data -- Collector info (Sammler)
Literature/Schematics (1) Air Ministry A.P.2548A

Model page created by a member from A. See "Data change" for further contributors.

All listed radios etc. from MILITARY U.K. (different makers for same model)
Here you find 118 models, 86 with images and 42 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
Threads: 2 | Posts: 3
Hits: 793     Replies: 1
mil-gb: R1155;
Gabriele Seccia

Salve ai soci . Per la prova di questo ricevitore , mi sono autocostruito alimentatore e amplificatore valvolari , essendone il ricevitore sprovvisto.

Per provarlo ho voluto cominciare col collegare solo la tensione dei filamenti non vedendo accendersi questi ultimi , mi sono accorto che il cavo di collegamento che va dall'alimentatore al ricevitore era molto caldo , dopo aver tolto tensione , mi sono accorto che nn c'erano piu i 6,3 V all'uscita dell'alimentatore.

Dove potrei ricercare il guasto nel ricevitore ? 

Saluti Gabriele

Biagio Laureti

Ciao Gabriele, ma hai dimensionato correttamente l'alimentatore?.

Considera che l'assorbimento dei filamenti del solo ricevitore (n.10 valvole) è:
5,8A x 6,3V = 36,4VA +10% = 36,7 + 7 = 43,7 VoltAmper

inoltre l'assorbimento dell'amplifificatore, ipotizzando un pentodo 6V6 ed  preamplificatore con 6SN7 è:
1,04A x 6,3V = 6,5VA + 10% = 7,15 VA

ipotizzando che l'alta tensione sia ottenuta con 2 doppi diodi tipo 6X5 (ciascun può fornire solo 70 mA di anodica)
0,6A x 2 = 1,2A x 6,3V = 7,56 +10% = 8,3 VA

per un totale di 43,7+7,15 + 8,3 = (59,15) 60 VA cioè
6,3V 9A 60VA  che per il solo filamento non è male.

Con 9A se il filo non è ben dimensionato è normale che scaldi.

In merito poi alla corrente andica considerando una tensione alternata efficace di 250V si ottiene
250V x 0,07A = 17,5VA + 10% = (19,25) 20VA per ciascun avvoltimento primario, ottenendo per i 2 avvolgimenti = 20x2= 40VA che sommati al vattaggio per il riscaldamento si ottiene un bel trasformatore da 60 + 40 = 100 VA di potenza apparente

Penso tu abbia già esaminato gli assorbimenti  ma secondo me il trasformatore potrebbe essere sotto dimensionato.
Saluti biagio



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mil-gb: R-1155;
Bo Samuelsson


On order from the Air Ministry (AM), Marconi Wireless Telegraph Company in 1939 started the development of a transmitter/receiver system, the T1154/R1155, based on the AD77/AD6872 which was used in passenger aircraft. By that time Marconi was the leading manufacturer of aircraft radio in England and perhaps in the world. The system was intended for use in heavier military aircraft, and during the second world war it was used in light bombers like the Blenheim and Mosquitio, and in heavy bombers like the Stirling, the Halifax and above all the famous Avro Lancaster.

In the beginning of 1940 the Ministry of Aircraft Production (MAP), accepts the design and the first production set is installed and tested in june that year. Marconi has the overall technical responsibility and E K Cole (Ekco) is responsible for the production. Plessey and EMI are also producing in addition to Marconi and Ekco.

The R1155 was manufactured as models R1155, R1155A, B, C, D, E, F and L, M, N. Of these models R1155, R1155A, B, C, D, E and F were intended for use in aircraft. Model R1155 had no filters, A had the IF traps added and B also had the radar filters. D, E and F were the corresponding receivers with steal case instead of aluminium. C was a model with direction finding circuits working on HF, was taken out of production early, and L, M and N were used in ground stations and vehicles, and in sea vessels for the Coastal Command. When the war finally ended more then 80.000 R1155´s had been delivered!

Receiver Data
The R1155 is a single super with one HF stage and oscillator/mixer, a total of three tuned circuits, and two IF stages. With detector, BFO and AF stages there is a total of 6 valves plus a magic eye as tuning indicator. There are facilities for direction finding and homing and the D/F part has 3 valves.  The set covers 75 to 1500 kHz LF/MF in two bands and 3 to 18.5 MHz  HF in three bands. Bandwidth is 5 kHz @-6 dB and the sensitivity is better than 10 uV on all bands.

Although rather simple the receiver has a remarkably good performance for short and medium wave world radio listening.

My Receiver
I had an R1155 in the end of the 1950s and used it for DX-ing. I eventually sold it when I got married and had children. Now I am retired and I recently bought another R1155 which I have restored to its original state and again I use it for broadcast station DX-ing. The receiver was nearly untouched and after adding the DF valves it is like it came from the factory, probably in 1943. It is an R1155 modified to the A model by retrofitting the IF filter traps. The serial number is 32343.

Further info on my home page


End of forum contributions about this model