Here we go, there's the data on hFE and Vbe sorted by both and a spreadsheet (linked) with all the data / graphs this Peak DCA75 can output split by sheet for each transistor which is:
Measurements: hFE, Vbe, VceSat, IcLeak
Graphs: Ic / Vce, hFE / Vce, hFE / Ic, Ic / Vbe, Ic / Ib
Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.
Yep, they did come with the mounting kits for them all too, that was a spot of luck!
Measurements: hFE, Vbe, VceSat, IcLeak
Graphs: Ic / Vce, hFE / Vce, hFE / Ic, Ic / Vbe, Ic / Ib
Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.
Yep, they did come with the mounting kits for them all too, that was a spot of luck!
Attachments
Germanium triode found . . .
I was looking at a document on a Tektronix 576 component tester.
Lo and behold: them there found GERMANIUM solid state triodes in production far before the SIT's.
They changed the leads
That leads to an all too recognized curve.
as (s)he says a few laine on, after doing the same with an 6SN7 . . : "I guess we have all seen a Titanic movie."
(It surprised mee before that in many JFETs the drain and source are also interchangeable.)
I was looking at a document on a Tektronix 576 component tester.
Lo and behold: them there found GERMANIUM solid state triodes in production far before the SIT's.
They changed the leads
That leads to an all too recognized curve.
as (s)he says a few laine on, after doing the same with an 6SN7 . . : "I guess we have all seen a Titanic movie."
(It surprised mee before that in many JFETs the drain and source are also interchangeable.)
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..it'd be nice to put some of these into something and see how they sound, they look very cool
Congratulations ElliotA
In my photos archives I find this , looks familiar like 2SB***
Was from old DIY blog who are not more available on line.
Ge power darlington output stages....maybe
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Hi SoundHappy
Could Ypu please post the schematic of the tested circuit?
(from page 4)
With trimmed values of R You tested?
Thanks
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He tested germanium with 20 x times higher voltages as well
What would a real life circuit look like exploiting this? I can imagine stacking a device to keep the voltage constant.
@ Zoran
Was from this funny video germanium transistors, audio pre amplifier, part 2 - YouTube
Was from this funny video germanium transistors, audio pre amplifier, part 2 - YouTube
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I found EMT NoiseX output stage, transformer driver, schematic. I sketch sch, but some values of Cs I simply cant read... .
At the very output end are Germanium pair trnasistors.
I remember that this circuit had high amplifiaction rate. (And output interstage transformers are simply excellent.)
Power suply is also with Germanium pass transistor, but I didnt took the scematic. Sorry
.At the very output end are Germanium pair trnasistors.
I remember that this circuit had high amplifiaction rate. (And output interstage transformers are simply excellent.)
Power suply is also with Germanium pass transistor, but I didnt took the scematic. Sorry
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Congratulations ElliotA
In my photos archives I find this , looks familiar like 2SB***
Was from old DIY blog who are not more available on line.
Ge power darlington output stages....maybe
Thanks! Definitely an interesting thing to see isn't it, and agree on the 2SB**, there's more a similarity there I'd say....
There's somebody selling germanium 2N174, 25pcs, CHF 250.–
(I don't know this guy)
This is way above my head, I just saw there's a bit a "hype" for them, so ...
Maybe it is as good as the sony VFET?
(I don't know this guy)
This is way above my head, I just saw there's a bit a "hype" for them, so ...
Maybe it is as good as the sony VFET?
No, 10kc. Makes you feel old.
With some faster drivers, such fat slow parts can "do audio", testing at the 1W level at the top of the audio band. Since real speech/music falls-off past 1kHz/kc, this is rational. (We used to be warned to NOT try full power at high frequency because the shoot-through current would melt the transistors.)