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UNICA FREGAT-1038 1945 SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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  • Also known:
    UNICA FREGAT1038 1945 FREGAT 1038
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Relevant AUDIO forum topics:
Házi gyártmányú erősítő....
Hi!

Hoznának egy ilyet, valami külső tápról ment, de az nincs meg. http://keptarhely.eu/view.php?file=20220608v01x4ecza.jpeg http://keptarhely.eu/view.php?file=20220608v01xr4lpa.jpeg http://keptarhely.eu/view.php?file=20220608v01x4lxvl.jpeg http://keptarhely.eu/view.php?file=20220608v01xdfp5f.jpeg Tudná Valaki, hogy a panelt, miből ollózta az alkotó? Esetleg a táp delej mekkora? Kösz
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
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