The instrument
Albiswerk Zürich AG was a Siemens production facility in Switzerland, based in Albisrieden-Zurich. It manufactured telephones, radios, military telephones and radios, and other electrotechnical products.
Details
The following elements are installed in the Ela amplifier power amplifier type Albis 502/63: Tubes 2 x EL 34, EF 86, E 80 F and electrolytic capacitors 3 x Mallory FP 234.