Naval Communications Receiver B40

Murphy Radio Ltd.; Welwyn Garden City

Data
Forum
Pictures
Collections

  • Year
  • 1953–1956
  • Category
  • Commercial Receiver (may include amateur bands)
  • Radiomuseum.org ID
  • 76120

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 14
  • Main principle
  • Superhet with RF-stage; ZF/IF 500 kHz; 2 AF stage(s)
  • Wave bands
  • Broadcast plus more than 2 Short Wave bands.
  • Power type and voltage
  • Alternating Current supply (AC) / 115/230 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 7 cm = 2.8 inch
  • Power out
  • 2 W (unknown quality)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Naval Communications Receiver B40 - Murphy Radio Ltd.; Welwyn
  • Shape
  • Boatanchor (heavy military or commercial set >20 kg).
  • Dimensions (WHD)
  • 13 x 19 x 16 inch / 330 x 483 x 406 mm
  • 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".
  • Net weight (2.2 lb = 1 kg)
  • 46 kg / 101 lb 5.1 oz (101.322 lb)
  • Price in first year of sale
  • 500.00 BP
  • Author
  • Model page created by Alexander Küffer. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

The model Naval Communications Receiver is part of the collections of the following members.

 Forum

Forum contributions about this model: Murphy Radio Ltd.;: Naval Communications Receiver B40

Threads: 2 | Posts: 2

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
V205 Noise Limiter CV140 6AL5 CV4007 5726
V301 AF Amp CV454 EF93 CV4009 5749
V302 Output CV2136 6BW6 CV4043 6061
V303 Rectifier CV493 6X4 CV4005 6063
V304 Rectifier CV493 6X4 CV4005 6063
V305 Stabiliser     CV1832 0A2

In most cases, "Preferred" valves were fited by the manufacturer, and when replacements were necessary, "Reliable" types were used if available. Excerpt from original manual.

Martin Bösch, 03.Jun.07

Weitere Posts (1) zu diesem Thema.

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.

Martin Bösch, 02.Jun.07

Weitere Posts (1) zu diesem Thema.