Miloslavskij class A amplifier

These designs, using single-ended and/or push-pull layouts with no overall feedback, were adopted as a basis for a 3-way power amplifier (0.5 to 10W) with passive (phase-linear) filters of 6dB/octave. Intended to drive efficient speakers within sound pressure level peaks of 100 to 108dB in rooms with volumes of 30 to 120 cubic metres, comparable to listening to symphonic music somewhere in the centre of the pits at the fortissimo, the upper frequency limit of such amplifiers may be 20MHz or more. This approach, then, recognises the fact that the maximum undistorted sound output of a speaker occurs long before the rated maximum electrical handling specification.

Non-linear distortion of the emitter follower depends primarily on the ratio between R3 and the emitter follower's input resistance, as well as on transistor linearity and the local negative feedback of this stage (0.1 to 0.2% max). The smaller the ratio, the lower the distortion. Diodes can be paralleled across the output devices to cope with adverse loads.

Input transistors - Vce(max) of 120-300V, Ic(max) 0.5-1A, fT of 20-50MHz, Pc(max) of 0.6-1.5W and a current gain of 70-140. Output transistors - Vce(max) of 300-500V, Ic(max) 2-5A, Pc(max) of 25-50W and a current gain (Darlington) of 3-5,000. Capacitors in the signal path are chosen to attenuate LF gain.

A push-pull version gives a higher output.

Output transistors - Vce(max) of 120-400V, Ic(max) 8-12A, Pc(max) of 50-120W, fT of 3-20MHz and a current gain (Darlington) of 5-10,000 (output device 60-90). For good symmetry of arms R8 ≈ R9 and βTr3 x βTr2 ≈ βTr4 x βTr5 and preferably βTr3 ≈ βTr5. To reduce instability (10 to 20%) of continuous quiescent current with temperature, R8 and R9 can be PTC thermistors. Maximum temperature of transistor junctions must not exceed 70-80°C.

A set of three amplifiers, associated filters and controls, regulator and supply could be fitted inside individual speakers thus producing an active system. Alternatively, a separate enclosure could be used. A suitable regulator might be that shown below which, with a 5V operating differential for a 29V supply, can be fed from a 25Vac primary (full-wave rectification to reduce transformer noise). Additional smoothing and decoupling can be placed near the amplifiers.

An "Audio preamplifier (RIAA) with no t.i.d." by Yuri Miloslavskij, was described in the August '79 edition of Wireless World. This used three transistors and was passively equalised (diagram here).

Other class A designs; Linsley Hood, Stan Curtis' ETI System A and Jean Hiraga's 'Le Monstre'.

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楩⁦㬩 †††椠⡦戠⤠ †††笠 †††††戠椮獮牥䉴晥牯⡥摣癩‬⹢慬瑳桃汩⥤਻††††੽††⥽⤨਻紊ਊ㰊猯牣灩㹴ਊ猼祴敬ਾ⌉潢祤⸠摡敃瑮牥汃獡筳慭杲湩〺愠瑵絯㰊猯祴敬ਾ㰊楤⁶瑳汹㵥戢捡杫潲湵㩤愣敢昶㬶戠牯敤⵲潢瑴浯ㄺ硰猠汯摩⌠〵愷㜸※潰楳楴湯爺汥瑡癩㭥稠椭摮硥㤺㤹㤹㤹㸢 †㰠ⴡ‭敓牡档䈠硯ⴠ㸭㰊ⴡ㰭潦浲渠浡㵥猢慥捲≨漠卮扵業㵴爢瑥牵敳牡档瑩⤨•摩✽敨摡牥獟慥捲❨㸠 †††††㰠湩異⁴祴数∽整瑸•汰捡桥汯敤㵲匢慥捲≨猠穩㵥〳渠浡㵥猢慥捲㉨•慶畬㵥∢ਾ††††††椼灮瑵琠灹㵥戢瑵潴≮瘠污敵∽潇∡漠䍮楬正∽敳牡档瑩⤨㸢 †††††㰠是牯㹭 †††††㰠瑳汹㹥 †††††映牯⍭敨摡牥獟慥捲⁨੻††††††††楷瑤㩨㤠㘱硰਻††††††††慭杲湩›‰畡潴㠠硰਻††††††††潰楳楴湯›敲慬楴敶਻††††††੽ਊ††††††潦浲栣慥敤彲敳牡档椠灮瑵笠 †††††††栠楥桧㩴㐠瀰㭸 †††††††映湯⵴楳敺›㐱硰਻††††††††楬敮栭楥桧㩴㐠瀰㭸 †††††††瀠摡楤杮›‰瀸㭸 †††††††戠硯猭穩湩㩧戠牯敤⵲潢㭸 †††††††戠捡杫潲湵㩤⌠㑆㉆㥅਻††††††††潢摲牥›瀱⁸潳楬⁤䈣䉂䈸㬸 †††††††琠慲獮瑩潩㩮戠捡杫潲湵ⵤ潣潬⁲〳洰⁳慥敳漭瑵ਬ††††††††††††††潣潬⁲〳洰⁳慥敳਻††††††੽ †††††映牯⍭敨摡牥獟慥捲⁨湩異孴祴数∽整瑸崢笠 †††††††眠摩桴›〱┰਻††††††੽††††††潦浲栣慥敤彲敳牡档椠灮瑵瑛灹㵥琢硥≴㩝潦畣⁳੻††††††††潢摲牥挭汯牯›䄣䐲㔰㬴 †††††††戠捡杫潲湵ⵤ潣潬㩲⌠晦㭦 †††††††戠硯猭慨潤㩷〠〠硰ㄠ瀲⁸㐭硰⌠㉁い㐵਻††††††੽ਊ †††††映牯⍭敨摡牥獟慥捲⁨湩異孴祴数∽畢瑴湯崢笠 †††††††瀠獯瑩潩㩮愠獢汯瑵㭥 †††††††琠灯›瀱㭸 †††††††爠杩瑨›瀱㭸 †††††††漠慰楣祴›㬱 †††††††戠捡杫潲湵㩤⌠䙄䍄䙃਻††††††††潣潬㩲⌠㘴㜳㐳਻††††††††楷瑤㩨ㄠ㔲硰਻††††††††畣獲牯›潰湩整㭲 †††††††栠楥桧㩴㌠瀸㭸 †††††††戠牯敤㩲渠湯㭥 †††††素 †††††映牯⍭敨摡牥獟慥捲⁨湩異孴祴数∽整瑸崢昺捯獵縠椠灮瑵瑛灹㵥戧瑵潴❮㩝潨敶Ⱳ †††††映牯⍭敨摡牥獟慥捲⁨湩異孴祴数✽畢瑴湯崧栺癯牥笠 †††††††戠捡杫潲湵ⵤ潣潬㩲⌠㕁䕃㘵਻††††††††潣潬㩲⌠晦㭦 †††††素 †††††映牯⍭敨摡牥獟慥捲⁨湩異孴祴数∽整瑸崢昺捯獵縠椠灮瑵瑛灹㵥戧瑵潴❮⁝੻††††††††慢正牧畯摮挭汯牯›㔣䄲䑅㭆 †††††††挠汯牯›昣晦਻††††††੽ †††††㰠猯祴敬ਾ †††††㰠捳楲瑰ਾ††††††畦据楴湯猠慥捲楨⡴笩 †††††††ਠ††††††††⼯搠瑥牥業敮攠癮物湯敭瑮ਠ††††††††慶⁲敳牡档敟癮ਠ††††††††晩⠠祬潣彳摡睟睷獟牥敶⹲湩敤佸⡦⸢摰∮
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੻†††††††††猠慥捲彨湥⁶‽栧瑴㩰⼯敳牡档㈵瀮⹤祬潣⹳潣⽭⽡㬧 †††††††素攠獬⁥晩⠠祬潣彳摡睟睷獟牥敶⹲湩敤佸⡦⸢慱∮
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੻†††††††††猠慥捲彨湥⁶‽栧瑴㩰⼯敳牡档㈵焮⹡祬潣⹳潣⽭⽡㬧 †††††††素攠獬⁥੻†††††††††猠慥捲彨湥⁶‽栧瑴㩰⼯敳牡档㈵氮捹獯挮浯愯✯਻††††††††੽ †††††瘠牡猠慥捲彨整浲㴠攠据摯啥䥒潃灭湯湥⡴潤畣敭瑮献慥捲⹨敳牡档⸲慶畬⥥ †††††瘠牡猠慥捲彨牵‽敳牡档敟癮猫慥捲彨整浲਻††††††楷摮睯漮数⡮敳牡档畟汲㬩ਊ††††††敲畴湲映污敳 †††††素 †††††㰠猯牣灩⵴㸭 †††㰠ⴡ攭摮猠慥捲⁨潢⁸ⴭਾਊ††搼癩挠慬獳∽摡敃瑮牥汃獡≳猠祴敬∽楤灳慬㩹汢捯Ⅻ浩潰瑲湡㭴漠敶晲潬㩷楨摤湥※楷瑤㩨ㄹ瀶㭸㸢 †††㰠⁡牨晥∽瑨灴⼺眯睷愮杮汥楦敲氮捹獯挮浯∯琠瑩敬∽湁敧晬物⹥潣㩭戠極摬礠畯⁲牦敥眠扥楳整琠摯祡∡猠祴敬∽楤灳慬㩹汢捯㭫映潬瑡氺晥㭴眠摩桴ㄺ㘸硰※潢摲牥〺㸢 †††㰠浩⁧牳㵣⼢摡⽭摡愯杮汥楦敲昭敲䅥⹤灪≧愠瑬∽楓整栠獯整⁤祢䄠杮汥楦敲挮浯›畂汩⁤潹牵映敲⁥敷獢瑩⁥潴慤ⅹ•瑳汹㵥搢獩汰祡戺潬正※潢摲牥〺•㸯 †††㰠愯ਾ††††搼癩椠㵤愢彤潣瑮楡敮≲猠祴敬∽楤灳慬㩹汢捯Ⅻ浩潰瑲湡㭴映潬瑡氺晥㭴眠摩桴㜺㠲硰∠ਾ††††††猼牣灩⁴祴数∽整瑸樯癡獡牣灩≴搾捯浵湥⹴牷瑩⡥祬潣彳摡❛敬摡牥潢牡❤⥝㰻猯牣灩㹴 †††㰠搯癩ਾ††⼼楤㹶㰊搯癩ਾ㰊ⴡ‭⼯⼯⼯⼯⼯⼯⼯⼯⼯⼯⼯⼯⼯⼯⼯⼯⼯⼯ ⴭਾ猼牣灩⁴祴数∽整瑸樯癡獡牣灩≴搾捯浵湥⹴牷瑩⡥祬潣彳摡❛汳摩牥崧㬩⼼捳楲瑰ਾਊ搼癩椠㵤氢捹獯潆瑯牥摁•瑳汹㵥戢捡杫潲湵㩤愣敢昶㬶戠牯敤⵲潴㩰瀱⁸潳楬⁤㔣㜰㡡㬷挠敬牡戺瑯㭨搠獩汰祡渺湯㭥瀠獯瑩潩㩮敲慬楴敶※⵺湩敤㩸㤹㤹㤹∹ਾ搼癩挠慬獳∽摡敃瑮牥汃獡≳猠祴敬∽楤灳慬㩹汢捯Ⅻ浩潰瑲湡㭴漠敶晲潬㩷楨摤湥※楷瑤㩨㌹瀶㭸㸢ऊ搼癩椠㵤愢汦湩獫潨摬牥•瑳汹㵥昢潬瑡氺晥㭴眠摩桴ㄺ㘸硰∻ਾ††††愼栠敲㵦栢瑴㩰⼯睷⹷湡敧晬物⹥祬潣⹳潣⽭•楴汴㵥䄢杮汥楦敲挮浯›畢汩⁤潹牵映敲⁥敷獢瑩⁥潴慤ⅹ•瑳汹㵥搢獩汰祡戺潬正※潢摲牥〺㸢 †††††㰠浩⁧牳㵣⼢摡⽭摡愯杮汥楦敲昭敲䅥㉤樮杰•污㵴匢瑩⁥潨瑳摥戠⁹湁敧晬物⹥潣㩭䈠極摬礠畯⁲牦敥眠扥楳整琠摯祡∡猠祴敬∽楤灳慬㩹汢捯㭫戠牯敤㩲∰⼠ਾ††††⼼㹡 †㰠搯癩ਾ††椼牦浡⁥摩∽祬潣䙳潯整䅲楤牆浡≥猠祴敬∽潢摲牥〺※楤灳慬㩹汢捯㭫映潬瑡氺晥㭴栠楥桧㩴㘹硰※癯牥汦睯栺摩敤㭮瀠摡楤杮〺※楷瑤㩨㔷瀰≸㰾椯牦浡㹥㰊搯癩ਾ⼼楤㹶ਊਊ