Service manuals, schematics, eproms for electrical technicians

HEATHKIT EA-3 SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    HEATHKIT EA-3 EA3 EA
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Relevant AUDIO forum topics:
Technics su-v650 nem szol.
Sziasztok. Egy technics su-v650 tip erositovel veszodok. Bekapcsolva a rele nem kattan, 10 mp alatt a volt. amp. hutoje forro. Tapfeszultsegek rendben, beleertve az AN7062-t is, zarlat nincs, hibas tranyot nem talaltam. Ami nincs rendben: az egyik csatorna volt. amp. kimenete +38v-on van. Bemenete +39.2v, tehat ez a resz mukodik. Az AN7062 3. laba ahova a visszacsatolas erkezik, 10v-on van 0v helyett. Kivett SVI3205-el a helyzet valtozatlan. Itt kifogytam az otletekbol. Rajz van fenn a tanyan, csak a pdf nem engedi a kivagast, igy nem tudom feltenni a rajzot. Kerlek adjatok valami otletet, hogy mivel probalkozzak. Udv.
Rotel RA-980BX equivalent transistors
Hi All,


I have a Rotel RA-980BX amp with a blown channel. I have sourced most of the transistors, but am struggling to find the other 4.


Part numbers as follow:
2SC3478
2SC4381
2SA1376
2SA1667


What would be suggested equivalents / suitable replacements?


Also, some advice, I suspect the bias pot to be bad. Based on the circuit, would you think that the bad bias pot would cause the drivers and outputs to blow? Any suggestion on modification to prevent this re-occurring?


Thanks



Regards,
Werner
AIWA-NSX 999MKII
Kedves Mindenki! Tudna-e nekem valaki hasznos tanáccsal segíteni, a fenti típusú készülék klasszul működik de... ISZONYÚ HALVÁNY A KIJELZŐJE és már nagyon égek a gyerekeim előtt valamit kellene vele csinálnom tudnátok segíteni? Köszi előre is :-) Üdv Róbert
Sony HCD-RG222 Nincs hangerő szabályzás
Jó éjszakát Mindenkinek! Van eme cuccban egy ic. neve: BD3401KS2. Tutira hulla. Fűt mint állat, ha hűtöm akkor megjön a hang, durrog, felbőg, elhallgat. Van-e valakinek tapasztalata arról, mitől sül ez meg?
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