BD139-16 & BD140-16? Anyone use these transistors?

[tinitus]

Originally Posted by terranigma

You must have a capacitance meter which able to measure in picofarads.

actually, I'm lucky to have one I use for my speaker projects

will look at it tomorrow
thanks!

[tinitus]

capacitance figures seems quite high
fluctuates on the pf setting
nf setting gives stable readings


testing Hfe with multimeter appear to give correct readings, around 40
but I need a more stable way to connect transistor to meter
maybe just solder small wire bits to the legs for easy plug in
hmm, a sil/dil socket, or something

[ictmanager]

Originally Posted by jacco vermeulen

Back in the old days you had to open a semiconductor book to look at a datasheet, instead of clicking a pdf.
Of course, the semiconductor data book comes free if you've got a relative employed at the Philips NatLab in Eindhoven.
Free online datasheets often are abbreviated versions, sometimes saves you 10 to 14 pages.

A bunch of BD139/140s in parallel make a fantastic class A headphone amp output stage.
Philips versions are much nicer, Cob of 5.7pF, downside that the power they handle is 2/3d of the different die version.

Does anyone have a couple of genuine Philips BD139-16 and BD140-16 pairs for sale?