Model: Naval Communications Receiver B40 (B 40)
Antique radios, Old Time Radios
Naval Communications Receiver B40 (B 40)
Country:
Great Britain (UK)
Manufacturer/Brand:
Murphy Radio Ltd.; Welwyn Garden City
Year: 1953 – 1956
Type:
Receiver used for civil commercial purposes, e.g. point-to-point maritime or aviation communications, used or second hand sets often used by radio amateurs. Often used also for military communications, partly special variants to military specifications.Communication Receiver (also Amateur)
Mod.-ID = 76120
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Schematics etc.: 9 (for
members)
Principle
Superhet with a preamplification stage.
Please use «To add informations to model» if you know more! Thanks.
Récepteur TSF superhétérodyne avec préamplification de HF.
Superhet mit HF-Vorstufe.
Superhet with RF-stage; IF-Freq. 500 kHz; 2 AF-stage(s)
Wave bands
Bei der KW kann es sich um einen Gesamtbereich plus gespreizte Bänder oder um mehrere Bänder ohne Gesamtbereich handeln.Broadcast plus more than 2 Short Wave bands.
Power type and voltage
AC set plus voltage range.
/ = 2 different voltages
- = voltage from-to
* = «Special»
Apparareil à courant alternatif. Tensions mentionnées.
/ = 2 Spannungswahlen
- = von-bis
* = Fabrikwahl/«Spezial»
Trafo ist nicht immer mit Primär- undSekundärwicklungen versehen. Dadurch kann das Chassis ein gefährlichesPotential führen.Alternating Current supply (AC) / 115/230 Volt
Loudspeaker/pwr.out
Permanent magnet type moving coil speaker (principle by Rice-Kellog, without field excitation coil).
Haut-parleur avec système dynamique à aimant permanent (sans bobine d`excitation).
Permanentdynamischer Lautsprecher, also (modernes) Tauchspulenprinzip mit Selbsterregung bzw. Permanentmagnet statt Magnetspule. Siehe «Radios von gestern» Seiten 329ff.Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
/ 2 W
/ Ø 7 cm = 2.8 inch
from Radiomuseum.org
Model: Naval Communications Receiver B40 (B 40)
Material
Metal case.
Caisse en métal.
Gerät, dessen Gehäuse aus Metall gefertigt ist. Es kann sich um verschiedenartige Metalle und Oberflächenbearbeitungen handeln. Ist es hingegen nur ein Chassis, so erhält das Gerät eine andere Bezeichnung.Metal case
Shape
Tablemodel, high profile (upright - NOT Cathedral nor Tombstone).
Dimensions (WHD)
13 x 19 x 16 inch / 330 x 483 x 406 mm
Valves / Tubes
14:
CV4014
(more
for members)
Notes
The Murphy B40 Series of Naval Communications Receivers are receivers for shipboard use (British Navy, submarine), coverage 640 kHz to 30600 kHz in five ranges, IF-selectivity 1kHz/3kHz/8kHz, BFO. Also fix-frequency xtal-option. Model suffix A, B, C or D, the B40A, B40B, B40C and B40D, are some in details different variants. Also referred as "lighthouse- or tower-receiver".
This model was suggested by Alexander Küffer.
Variant C
More pictures
More information on
Naval Communications Receiver B40 (B 40) (Murphy Radio Ltd.; Welwyn Garden City)
B40/A/B/C
Circuit Reference
Stage
CV no.
Equivalent
V101
First RF
CV327
EF52
V102
Second RF
CV303
EF22
V103
Mixer
CV302
ECH22
V104
Oscillator
CV327
EF52
V201/2/3
1st, 2nd, 3rd IF
CV303
EF22
V204
Det. and AGC
CV140
EB91, 6AL5, CV4025
V205
Noise Limiter
CV140
EB91, 6AL5, CV4025
V206
BFO
CV303
EF22
V301
AF Amp
CV303
EF22
V302
Output
CV304 or CV2136
EL22, 7C5 or 6BW6, 6061
V303
Rectifier
CV346 or CV1790
EZ22 or 7Z4
V304
Stabiliser
CV287
150B3
B40/D (FSK Option)
Circuit Reference
Stage
"Preferred"
CV no.
Equivalent
"Reliable"
CV no.
Equivalent
V101
First RF
CV138
EF91
CV4014
6064
V102
Second RF
CV454
EF93
CV4009
5749
V103
Mixer
CV2128
ECH81
V104
Oscillator
CV138
EF91
CV4014
6064
V201/2/3
1st, 2nd, 3rd IF
CV131
EF92
CV4015
M8161
V204
Det. and AGC
CV140
6AL5
CV4007
5726
Model No. /
Admirality Pattern
B40 prototype
57140
Typenumber engraved in flat cover above dial
modes CAL, R/T, Tune system, CW high/low, listen through
dial lock in left lower corner of main tuning knob.
B40A
57140A
Typenumber above dial moulded in cast front panel
modes CAL, R/T, Tune and CW high/low.
Speaker switch lefthand under speaker grid.
Physical changes in layout, mechanical changes to facilitate maintenance, substitution of improved components.
B40B
57140B
Typeplate above dial screwed
Re-designed tuning drive, addition of crystal filter in circuit, note filter deleted.
AGC switch left under speaker and speaker switch fitted above mains switch .
B40C
57140C
Typeplate above dial screwed ,
AGC switch left under speaker and speaker switch fitted above mains switch.
RF assembly modified to allow Common Aerial working (use of several receivers on same antenna).
B40D
57140D
Typeplate above dial screwed
Modes CAL, R/T, Tune, FSK narrow CW high/low and FSK wide high/low
additional control for Oscillator Trim (fine tuning) left under CRYSTAL switch.
Different valve layout (additional rectifier, EF9x series).
B41
VLF variant
Typenumber above dial moulded , lettering printed on faceplate.
B41
VLF variant
Typeplate above dial screwed , faceplate with lettering screwed on set.
62B
VLF / HF general coverage variant .
Typeplate screwed above dial, AGC switch underneath speaker grid, speaker switch above mains switch.
