Phase Linear 400 transistor replacements

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Can someone recomend curent output drivers & finals (the bottom row & the upper rows) for my phase linear pl-400 first series(the model with the power meters)That I can get from mouser,newark,digi-key.The original drivers were rca410. & the finals were pl909.I have been told that the mj15024 or mj21196 can be used for the finals but what do I use for the drivers?
 
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