[RadioSvit]

Made a new video about the Telefunken T-776 GWK radio receiver . Here is the English translation of the subtitles

The Telefunken 776 GWK radio receiver of 1937 is a bright representative of the heyday of German pre-war radio technology, which fell precisely in 1937..39 years. In 1937, in the company's line, it occupied a niche below the company's flagship T 7000, but above the middle class.
Three ranges - Long waves, Medium waves and Short waves from 20 to 50 meters. Six radio lamps "C" series СК-1, CF-3, CB-2, C/EM-2, CL-4, AZ-1 and one Urdox (current stabilizer for heating cathode filaments).
It is a bit surprising, but with its arbitrarily high status, excellent high-sensitivity acoustics on a speaker with a diameter of 26 cm, a powerful amplifier and the complexity of the design, there is no high-frequency input amplifier... The receiver is intended for use in alternating and direct current networks from 130 to 240 volts.
In contrast to the American principle of engineering design, "We will make everything difficult simple, but qualitatively and with a reserve", in pre-war Germany designers adhered to another principle - "We will achieve the maximum at the limit of possibilities, but with a minimum of resources, even if it is difficult."
And this Telefunken is a vivid representative of this concept. Sometimes it is difficult to understand why in a 6-tube radio receiver with a universal power supply unit, which already automatically leads to the idea of its simplification due to the rejection of a power transformer, a sophisticated system of switching from direct current to alternating current is installed using ... an autotransformer , and for switching the voltage power supply from 220 volts to 127 volts, it is necessary to change the urdox in the power supply unit to the corresponding voltage value. Why do it simply, when you can do it complicatedly and cunningly... It is not otherwise to provide radio services with work as much as possible, because few clients can do it on their own at home... .
Such intricate schemes help to achieve the maximum characteristics of the device with a minimum of radio lamps, but hardly increase its reliability and durability. And at the same time, the use of a combined triode radio tube and an optical indicator of precise tuning to the station in the first stage of UHF is surprising, as well as the use of a single continuous HF band with the refusal to divide it into several sub-bands.
Nevertheless, the receiver is quite sensitive and has a very powerful and balanced sound.
Let's evaluate it...

[Video: https://www.youtube.com/watch?v=JSXwhQDyRsE&t=5s]