Dan Bedford's 1 Transistor Reflex Set

Dan Bedford's 1 transistor radio

Dan Bedford's 1 transistor radio

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Hello Dave,

Here is a set that I have wanted to build since it appeared in Radio, Television and Hobbies in June of 1963. It used the (at the time) very latest "drift" transistor. As a school student on pocket money, the transistor was out of my reach.

Life and many other projects got in the way but here it is after a space of forty two years. The set is a one transistor reflex design with voltage doubling detection and regeneration. The transistor used is an OC169, but could be an OC170 or OC171. American builders could use a 2N370 or 2N371. The later AF117 would also be suitable.

I followed the circuit and general layout of Jim Rowe's original but the regeneration was touchy and would go from none to full oscillation harshly. I rewound the coil using 44/40 litz wire on a thin styrene former with no taps. It is now possible to sneak up on the "sweet spot" smoothly.

The set is a very hot performer and receives all my locals without aerial or earth. I'm happy to correspond with anyone wishing to build this set.

Kind regards,
Dan Bedford

Here is the original article: (600-800k each JPG)
Transistor Reflex Radio Project, Page 1
Transistor Reflex Radio Project, Page 2
Transistor Reflex Radio Project, Page 3
Transistor Reflex Radio Project, Page 4