I wish I was able to read more about this 1929 Soviet portable set. But the text is in Russian, and the quality of the scan is rather poor, so I can’t even make out any words to give me hints. But this is obviously a portable receiver from ninety years ago, and some lucky comrade was able to put it together and pull in the signals.

The set appears to be a two-tube regenerative receiver which fits handily into a suitcase.  One tube servies as detector and the other as audio amplifier.  The circuit appears to be regenerative, with a tickler coil feeding the signal back into the main antenna coil.  Tuning is accomplished with a tapped coil and variable capacitor.  The cut-out in one corner is obviously to stash the batteries, and perhaps the headphones and antenna wire.

The plans for the set appeared 90 years ago this month in the May 1929 issue of Радио любитель (Radio amateur) magazine.