Murphy A24C Radio


 I acquired this ginormous console receiver dating back to 1934 from a chap near Bath many years ago. It's related to another Murphy which I examined only a few days before looking at this model again. I remember when I first got this set that it looked a little different to other pictures of the A24C. It has a set of four matching knobs which look original plus two extra ones that look different. In fact this example has two extra front panel controls.



Here's a full frontal of the rather large and heavy radio and below, the various labels and numbers. The bottom part of the case looks like maple and the top an exotic hardwood. Note the matching numbers unlike my A30.






 The loudspeaker is huge. The energising coil is something like seven inches long and nearly four inches in diameter and is mounted in a heavy iron casting.



 Here's a rear view. No expense spared when it came to the rear cover. It's hardwood, nearly half an inch thick, made from five pieces of wood jointed together and secured by decent quality captive screws , a far cry from the usual cheap fibreboard.




The valves fitted in this example are, left to right: an Osram AC/TP RF amp/mixer/oscillator with B9 base; a Mullard VP4A IF amp on a B7 base; an early AC/HL/DD detector/AVC detector/audio amp with a B7 base and an AC2/PEN audio output on a B7 base. The rectifier valve is missing, and judging by the layer of dust on the B4 socket, I guess someone might have fitted semiconductor diodes under the chassis. Originally the IF amplifier would have been an AC/VP1 and the rectifier a U12. I'm slightly puzzled by the red/white wire going the the top cap of the leftmost valve. Below is a view of the mains transformer. It's pretty well identical to that in my Murphy A30.  Good quality undegraded wiring!

Above: It looks like the external/internal speaker wiring has been modified because the dangling selector lead is missing.


 The tuning dial is identical to that in the Murphy A30.


 Below, the A24C circuit diagram. Click to see the service details.

Bottom left is the circuit of a block carrying a whole lot of condensers and resistors. If this hasn't already been checked out by the last owner it'll prove problematical due to leaky condensers and drifted resistors.

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