It's a waste of time and money to design an AF amp for the Drake.
I used a (now) 75cent complete TDA2030 module from china.
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Like this one:
https://www.ebay.com/itm/314750105717?_skw=TDa2030+amplifier+module&itmmeta=01JGHB55413WV2745A8XBJYQBN&hash=item4948917875:g:upwAAOSwiFZky38Y&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKl9LzhQlEV7hr7qISFGACsJ4nRv905MP85TlwPdXY5R6c3VMsAxJIQKAv5Wui8d0Yi5pi9YIYuzUCSjP5ml2suXZumYP9VjoXxEuLgFUi%2FbDTCLNL%2Bfzq1996uV4tf62yNmyWpQMXYoXUZz8Vv9amSvPAB9B%2B0dDCc1DrezcMlCO9tR6%2FQCZNyVOKUH0VaPBtchCvaYlnLrPBcthdKwTS0tsusftmUTkrWDt3q1FPcmtYKvA7qfjd%2FramvBIYhkHsdzm2t9cFMXaqQoBKG16X7Bgfc83okBCT8p2OAuM1pXVw%3D%3D%7Ctkp%3ABk9SR57SlKuEZQ
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See my Folder in the Files section:
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73,
Gary
WB6OGD
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Gary WB6OGD