164
Item nr.


Aetherkruiser AK1500 Table top

A Van der Heem design.


Data for Aetherkruiser AK1500
ProductionThe Netherlands, 1950.
Price was 198 guilders.
BandsLW (950-2000m), MW (175-580m), SW (15-55m).
TubesECH42 EF41 EBC41 EL41 AZ41.
CabinetWood. Size 38x25x21 cm. Weight 6.8 kg.
PowerAC 110-250V, 40W.
DocumentsSchema of Erres KY504.

The Design

Electrically identical to the Erres KY504, this radio differs in the cabinet and in the position of the dial, which is on the upper front. The chassis has a small rack in front with wheels for running the tuning string.

Let me mention that around 1950 it was popular to obtain the negative grid bias from a resistor in the B- supply. More commonly, this grid is at (DC) ground level and the catode lead of the tube contains a resistor bringing it to a positive level. Such a cathode resistor would of course only pass the catode current for one tube, but the resistor (and its decoupling capacitor) must be repeated for various tubes. This radio, and also the famous Philips BX591A types for example, used the different way: the resistor in the B- builds up a real negative potential against ground, and this is fed to the grid. The resistor is decoupled by a 100uF electrolytic capacitor and taps supply the (lower) bias for the RF tubes. Because the B- resistor (of value 100 to 200 Ohms typically) runs the current of all the tubes, its decoupling is critical. The capacitor often dries out and looses its capacitance, leading to oscillations.


Obtained10/2000 from Winkeltje van Sinkeltje.
Condition8.
DisposedSold 1/1900.

This Object

Repairing the radio electrically was a quite standard job. With this radio I made my first attempt in refinishing a cabinet with original-looking varnish. I learned a lot from it, but am not completely satisfied with the result.

Part of Gerard's Radio Corner.
Generated by SiteBuilder on 26/2/2024 by Gerard (g.tel@uu.nl)