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#6692
Billy
Moderator

In the build notes it advises if you use a high gain transistor like the BC549C you should use a resistance of 33K as a starting point so I’d socket R25 and try different values

The BC549C can go from 100 to 800 hFE according to the datasheet

The ones I have all test using a DCA55 from 420 to 560 hFE