Re: What’s actually better?

 

Hi ohwenzelph,

Allison's metal 2n2222a transistors should be comparable to 2n2219a transistors, but like always the source of the transistors needs to be researched.  If Allison got good results with her 2n2222a and Farhan got bad results with his 2n2219, then it could be that the latter transistors were suspect.

Also note that she was using the improved "A" version of the transistor and it seems that Farhan was not.  The "A" version has higher hFE and hfe  and lower Vsat than the non-A version.

73.

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