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Yamaha Poor Quality Control

R

richardjhy

New Member
A-1020 got right channel blown due to accidentally shorted speaker terminal. Output transistors VAS pairs and a few resistors damaged, but driver transistors survive. To my surprise, Yamaha used C3298A batch O and A1306A batch Y as driver pair with measured Hfe = 99 and 200! Sounds to me Yamaha had a poor quality control in part selection at the time.20261105_141919.jpg
 
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