HMV 2007R transportable record player

 Restorations  Comments Off on HMV 2007R transportable record player
Aug 132020
 
HMV 2007R transportable record player

I was surprised to see this in the local animal welfare charity shop. I thought it looked too large to be an attaché case radio and too small to be a record player. Though it was styled like many 1950s UK attaché case radio models. Opening it revealed it was a record player. I was […]

Herge-2

 Russian Rod Pentode, Valve project  Comments Off on Herge-2
Apr 042018
 
Herge-2

The finalised design has a generous gain Audio Amplifier that can even drive a loudspeaker via a transformer and actually needs a volume control on stronger stations! The finished Hergé radio (with reaction for volume)   The theory is that using a loop aerial as the tuning coil (with a feedback coil on it too) […]

herge-radio-1

 Russian Rod Pentode, Uncategorized  Comments Off on herge-radio-1
Apr 042018
 
herge-radio-1

 We’ll call this 1 valve Regenerative Radio “The Hergé” in honour of his research and attention to detail. (fun stories too) Hergé wrote that strip (in French) for the Belgian newspaper in 1934 or 1935 just after the Japanese invaded China and blew up the Manchurian Railway. Tintin is picking up Japanese transmissions to/from spies […]

Experimenting with 1j18b

 Experiments, Russian Rod Pentode, Uncategorized  Comments Off on Experimenting with 1j18b
Apr 292014
 
Experimenting with 1j18b

Experimenting with Russian Rod Pentodes Here is Russian 1j18b (aka 1zh18b, 1sh18b really 1Ж18Б ) on IC breadboard. The 1j24b and 1j29b are actually better purchases. Testing 5.4MHz Hartley Oscillator at 16V and 25V. 1j18b with 1.2V NiMH for filament and  +15V to +32V test bench PSU This valve concept  was invented in 1950s but […]