05-02-2025, 12:20 PM
This is the spec sheet for the Germanium AF139 https://www.silicon-ark.co.uk/datasheets...iemens.pdf . I have some that I bought from Langrex at £10 for 5.
Quite apart from the low frequency specification being on the money on my Peak tester, there is no leakage current. The last gasp of Germanium mesa structure transistors were quite amazing.
But hfe is rather important for RF oscillators.
Quite apart from the low frequency specification being on the money on my Peak tester, there is no leakage current. The last gasp of Germanium mesa structure transistors were quite amazing.
But hfe is rather important for RF oscillators.
