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murphy: Murphy B40 variants

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Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » murphy: Murphy B40 variants
           
Martin Bösch
Martin Bösch
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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.

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.

This article was edited 03.Jun.07 07:53 by Martin Bösch .

  
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