More powerful 2n3055 transistor11/7/2022 ![]() Quasi Complementary means the final output transistors are on the same configuration. ![]() On the Elliott Sound Products site there are several articles about basic Quasi Complementary amplifiers. The do work well as audio amplifiers, provided the circuit can provide them with enough drive current and the feedback loop is good. By the late 70's they had been replaced by higher beta transistors in nearly every audio application. Not the most efficient, yes, but it won't be much hassle xDĢN3055's were used in audio because they were stable and cheap. As of the power supply, I can easily find an old stereo system and salvage its power supply transformer, from which I can design my own linear supply. ![]() That may make it suitable for other uses, eventually. It's almost a full-range amplifier with bass-boost, come to think of it LOL. My project can take the form of multiple circuits (say one circuit per driver, thus 4 circuits), this way I can give both the bass and full-range their own on/off and volume control if necessary. So, to summarize this, I'm not sure which amplifier circuit(s) I should choose among all the schematics I can find on the net. For the bass driver(s) however, I'm pretty much stuck to the four 2N3055s I got, if I don't buy anything that is. More powerful 2n3055 transistor drivers#I assume the amplifier for the full-range drivers can be built using parts that are fairly easy to find. As for the drivers themselves, I already have a pair of 80s Diatones that sound particularly good with higher frequencies. Since connecting anything on my piano's audio output automatically disables internal speakers, I'm going to need an amplifier circuit for another pair of speakers covering full-range. They sound just fine, but the bass sounds a little weak. They're not exactly big in terms of physical size, but I'm fairly sure they could provide more powerful bass for my Yamaha NP-31 electronic piano, which has a pair of 6W speakers. More powerful 2n3055 transistor tv#Then while searching information about them I saw they apparently used to be among the top-notch transistors for audio amplifiers in the 60s! A few days later I was examining the frame of an old Toshiba projection TV to see if the boards were worth salvaging, then I noticed the 15W speakers. The circuit boards didn't have much interesting stuff, but I did grab the transistors. The two main things that dogged early transistors were high frequency (parasitic) oscillation, which led to thermal runaway, and secondary breakdown, whereby a flaw in one part of the transistor (the base-emitter junction) caused it to draw increasing amounts of current and fail, even when working well within tolerance.Īn element slightly lost in the wash, is the "format" of the early RCA 2N3055s - they were "homotaxial" - identifiable internally by thin substrates of silicon and a large chip (die).Here's the thing: This week I found a nice big power supply using four 2N3055s. ![]() "Exemplifying all that was admirable in British hi-fi, the 33 preamp (£43) and 303 power amp (£55) were Quad’s first commercial solid-state offerings, the company having waited for the new-fangled transistor to settle down before embracing it in 1967." A factor also contributing may have been the difficulty of obtaining in early 1966 good reliable 2N3055s.Ĭertainly British hifi manufacturers hung fire. It may have been the reported problems in Super Beatles, notably the failure of power transistors, that delayed the adoption in England of a new range of fully transistorized amps - the 4 and 7-series amps, released in May 1966, stand as a sort of half-way house, the preamps of most of the range being transistor, but the power amps all valve. For more on these, see the excellent pages on the Vox Showroom website, and R. The V1141 was preceded by the V14 and V114. The power section topology of the second version of the Super Beatle. ![]()
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