Good idea to specify which devices you are proposing to replace. These the drivers for the power amp output? Qe13~Qe16?
Stock devices -
2SA913 - 150V, 1A, 15W, B=150, ft=120MHz
2SC1913 - ditto
Your proposal to replace them with a 4MHz part is probably not a good one. Better choice: Toshiba 2SA1837 / 2SC4793. As long as you don't need a conductive tab, that is.
Stock devices -
2SA913 - 150V, 1A, 15W, B=150, ft=120MHz
2SC1913 - ditto
Your proposal to replace them with a 4MHz part is probably not a good one. Better choice: Toshiba 2SA1837 / 2SC4793. As long as you don't need a conductive tab, that is.
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