Mullard continued, more of the MAS24

This being 1938, obviously pushbuttons were provided, and the method used in this receiver is the direct action system. The pushbutton method was different to the more common system found in that the cover of each pushbutton could be removed. Then a key would be inserted into the button, and by turning the key the frequency selected could be changed. This was rather more user friendly than the system of presets which required access to the chassis, and were therefore a rather more daunting prospect to the average owner. The receiver is a 4 valve plus rectifier circuit using the Mullard "E" series of valves. This was a comparatively short-lived valve range that had side contacts on the base of the valve rather than the more usual pins. (See picture above right). The valve line-up was EF8, EK2, EF9, EBL1, AZ1, EM1. The EM1 was the tuning indicator, and this also had side contacts. As it was fitted in very few receivers these devices are very hard to find nowadays, either new or used. It may seem that such a high quality receiver appears to have few valves, of course it is not a simple as that, as some valves have two elements. Unusual in this receiver is the EBL1 output valve, which also includes two diodes. Philips also produced an equivalent of this set, designated the 660A.

Continue for the Mullard MAS8 "Magicontrol" set

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