valve push tube
31Boiler — For the Limp Bizkit song, see Boiler (song). A portable boiler (preserved, Poland) …
32wind instrument — /wind/ a musical instrument sounded by the breath or other air current, as the trumpet, trombone, clarinet, or flute. [1575 85] * * * ▪ music Introduction any musical instrument that uses air as the primary vibrating medium for the… …
33Marshall Amplification — Industry Amplification, Musical Instrument Manufacturing Founded London, United Kingdom (1960) Founder(s) J …
34Chevrolet Big-Block engine — The Chevrolet big block is a series of large displacement V8 engines that were developed in the USA during the 1950s and 1960s. As American automobiles grew in size and weight following the Second World War the engines powering them had to keep… …
35Wolf tone — A wolf tone, or simply a wolf , is produced when a played note matches the natural resonating frequency of the body of a musical instrument, producing a sustaining sympathetic artificial overtone that amplifies and expands the frequencies of the… …
36Single-ended triode — In a single ended triode (SET) vacuum tube electronic amplifier the entire audio signal waveform is amplified by the power triode, in contrast to push pull amplifiers where two output tubes work together in phase opposition. Small signal audio… …
37Antique radio — DIORA AGA RSZ 50 ca.1947 from Poland An antique radio is a radio receiving set that is collectible because of its age and rarity. Although collectors may differ on the cutoff dates, most would use 50 years old, or the pre World War II Era, for… …
38Diesel engine — Diesel engines in a museum Diesel generator on an oil tanker …
39Mechanical ventilation — In architecture and climate control, mechanical or forced ventilation is the use of powered equipment, e.g. fans and blowers, to move air  see ventilation (architecture). Mechanical ventilation Intervention …
40Meillerwagen — Manufacturer Gollnow Son Assembly Germany Class trailer …
