Valves Archives - Don Zalmrol

A Chernobyl visit with an Arduino Geiger counter

By Laurens Gregoir Sunday 01 September 2019ElectronicsArduino, Arduino Geiger Counter, Chernobyl, Exclusion Zone, Geiger Counter, Geiger Müller, Pripyat, SBM-20, SI-3, Terra-P, Tubes, ValvesNo Comments

Introduction Perhaps an odd project for my site but with some friends we visited the Chernobyl exclusion zone, small town of Zalyssa, city of Pripyat (Get out of here Stalker), Chernobyl (Vladimir Ilyich Lenin) nuclear power plant and Duga 3 Over The Horizon (OTH) Radar installation receiver on the 29th of…

Philips B6X12A valve radio

By Laurens Gregoir Wednesday 15 August 2018ElectronicsB6X12A, Electronics, OTL, Philips, Philips B6X12A, Tubes, ValvesNo Comments

Intro This is my postwar Philips B6X12A valve radio from 1962. The amplifier is designed in such a way you bi-amplify effect.Bi-amplify is just separating your high tones from your low tones and running them through their own separate amplifier. Specifications: Country of origin: The Netherlands Build-year: 1961-1962 Valves: 10…

Seeburg M100A Jukebox

By Laurens Gregoir Thursday 09 August 2018ElectronicsElectronics, M100A, Seeburg, Seeburg M100A, Tubes, ValvesNo Comments

The Seeburg M100A jukebox was the first in it's kind that allowed you to insert and play 100 selection (50 records with 2 sides). Other systems at that time only allowed you to insert around 20~30 records. This was all possible due the rail system that Seeburg used for this…

12AU7-6CG7 Headphone amplifier

By Laurens Gregoir Monday 26 December 2011Electronics12AU7, 6CG7, Amplifier, Electronics, Headphone, Headphone Amplifier, OTL, ValvesNo Comments

About This is my DIY build headset class-A tube amplifier that uses an OTL (Output Transformer Less) and MU follower design. The amplification is around 25dB with the 6CG7 valves, but you can also 6FQ7 for a little higher amplification. The downside of this is however that 6FQ7 doesn't have…