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Am primit un amplif. Luxman L-111a, care e ars si cam tre sa il fac...Plb ii k majoritatea tranzistorilor is speciali si nu cred ca ii gasesc, deci tre sa ii inlocuiesc cu altceva cine poate sa imi dea sugesti...Finali:-C2665;Alti tranz:-B647c;-D667c;Astept...

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poate sa imi dea sugesti...Finali:-C2665;Alti tranz:-B647c;-D667c;

C2665=2SC2655B647=2SB647D557=2SD557PS: discutie mutata unde-i e locul?!

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Mai ii o plb cine mio dat amplifu o scos 2 tranzistori finali cei care is dispusi in centru(are 4 ) si nu stiu daca cei doi scosi sun alt tip sau la fel. Nu puteti sa imi ras la aceasta dilema pls?

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2SC2665 e fabricat de Sanken si are Ucb=100V, Uce<100V, Ic=4A, P=55W, beta=90 tipic/1A.Complementarul lui e 2SA1135 cu Ucb=80V, Uce=80V, Ic=4A, P=55W, beta=90 tipic/1A.Se pot inlocui cu BD243/244C, BD911/912 etc, sau chiar cu unii in capsula mai mare si mai puternici ca BD245/246C, BD249/250C, TIP35/36C etc.In locul trz mai mici, cu rol de prefinali banuiesc, poti sa pui BD139/140 daca nu ii gasesti de cumparat.Bafta!

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Merci mult. K finali folosesc BD245 etc. Daca is mai puternici in cazu asta is de 10A si 80W ar trebui sa reziste mai mult nu?

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Desigur.Cred totusi ca ai trz complementari in etajul final. Deci poti sa pui BD245C (npn) si BD246C (pnp). Asta se poate verifica daca te uiti la trz prefinali, cum comanda bazele trz finali. Daca trz prefinali au legat emitoril de bazele trz finali, atunci sint si acestia complementari (adica ai si npn si pnp). Daca trz prefinal npn are legat emitorul de baza trz final, iar trz prefinal pnp are legat colectorul de baza trz final, atunci toti trz finali sint npn. Nu uita sa masori si trz prefinali, rezistentele din jurul lor, diode etc.Bafta!

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Bravo! Dar ce trz finali ai folosit acolo? Sa nu-mi spui ca cei din margini sint BD245C... :smt003

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Da am folosit BD245c si BD246c si merge de minune singura ploblema ii k se cam incalzeste. Dar cred k rezolv plobleema cu un ventilator de calculator cu tot cu radiator :supz:

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Cu regret te informez ca ce vad in poza sint facaturi, de obicei BU-uri cazute la testare si remarcate ca BD-uri diverse. Capsula originala e TOP3. Se gasesc BD245/246C bune facute de ST, de ce umbli cu gunoaie?

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Yo iam cumparat de la magazin nu am de unde sa stiu care sunt originali si care nu, o sa caut originali dar nu stiu de unde ai vreo idee?

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Uite cum arata trz original, are gaura de prindere neizolata:

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bine ca mam scapat de ei :smt005 iam reparat lu cineva o statie pe 2n3442 si nu am avut dinaia si iam pus pe cei de la amplifu asta aqm caut sa cumpar alti :tonqe:

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