murphy: Murphy B40 variants |
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02.Jun.07 22:10
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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.
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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.
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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.
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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).
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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).
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| B41 |
VLF variant
Typenumber above dial moulded, lettering printed on faceplate.
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| B41 |
VLF variant
Typeplate above dial screwed, faceplate with lettering screwed on set.
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| 62B |
VLF / HF general coverage variant.
Typeplate screwed above dial, AGC switch underneath speaker grid, speaker switch above mains switch. |
This article was edited 03.Jun.07 07:53 by Martin Bösch .
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