OLD stuff...

[okean]

Anul 1961, un radio deosebit  Toshiba model 9TM-40  , scala iluminata, amplificator de RF, cunoscut si ca " robot radio ", o bijuterie cu 9 transistori !

 

 

[dumitrumy]

[okean]

Firma " Tappan " vinde primul cuptor cu microunde, era 25 octombrie 1955 !

 

Editat Octombrie 26, 2023 de okean

[okean]

Condensator variabil " Faradon " cu mercur si mica model UC 1819 folosit in " radio spark transmissions " circa 1919 ...

 

Editat Octombrie 27, 2023 de okean

[okean]

Radio cu variometru circa 1920 ...

 

 

[daniels]

https://fb.watch/nZI7TQsF13/

[okean]

30 octombrie 1894: Daniel M. Cooper din Rochester, N.Y. a primit primul brevet din SUA pentru un ceas de pontaj !

 

[okean]

Reclama " Zenith "  1959 New York !

 

[dumitrumy]

[okean]

In 1969 aparea popularul Heatkit IG 18 care s-a produs pana in 1975 !

 

[BRANCA]

 Văd că mai "trăieşte" IG-ul Heatkit...

https://shop.heathkit.com/shop/product/thd-improvement-kit-for-ig-18-series-audio-generator-test-equipment-complete-kit-iga-18-1-17

[okean]

Un excelent oscilator audio cu distorsiuni reduse... in cuplaj cu un  VTVM (Vacuum Tube Volt Meter) erai " profesor "

In poza modelul  IM-18

 

 

 

[okean]

Originalul SNR Model Excelsior 52  model 1952 Franta

 

 

 

 

Si copia  Zvezda 54 model 1954 URSS

 

 

[dumitrumy]

The RAYDAC (Raytheon Digital Automatic Computer). A technician is performing a memory integrity check during the construction phase of the 30-bit RAYDAC computer on August 2, 1952. Designed for use in Project Hurricane, this four address binary machine built by Raytheon was installed in July 1953 at the Naval Air Missile Test Center at Point Mugu, California and was used for guidance/navigation system development, orbital trajectory computations for the CIA Corona spy satellite program, and radar tracking data analysis of rocket tests. Cooled by a liquid Freon®, its 5,200 vacuum tubes consumed 28 kW of power. It had 18,000 crystal diodes, 1,152 words of 36-bit 305 µs acoustic delay line memory, and 630 relays. With a 3.77 MHz clock, addition took 38 µs, multiplication 240 µs, and division 375 µs, excluding the memory-access time, with 5-bit check numbers (Hamming type error detection) for self-checking the built-in hardware double-precision floating point circuitry with normalization. The system was architected like a Princeton IAS machine so did not have an operating system, programming was strictly in machine language because RAYDAC did not even have an assembler, not enough memory for it. Back then CPU opcodes were called orders and had to be tediously coded by hand in groups of 18 octal digits representing a 54 bit instruction. Because of this, the 18.6 m² computer required a large staff to operate, 4 operators, 14 maintenance, 25 mathematicians, 5 clerks, and had 4 coders in training.

 

[icar]