Trying to repair an Yamaha A-1 integrated amplifier. The 2SK100 are faulty. Is the µPA68H a suitable replacement? I have seen that some Japanese guys are using a matched pair of 2SK30 or 2SK117. Is that a better solution?
I have once measured the four k100, labeled Y-K100, of an A1 and the Yfs is in the range of 25 mS, IDss about 10mA to 15mA. Therefore I think 2SK389, if you can find them, or a matched pair of 2SK170, high BL grade or V grade, will do nicely.
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