murphy: Murphy B40 variants
ID: 142000
This article refers to the model: Naval Communications Receiver B40 (Murphy Radio Ltd.; Welwyn Garden City)
murphy: Murphy B40 variants
02.Jun.07 22:10
3643
| 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. |
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