Not for a DRIVER ... (600pF cob/30mhz Ft) In the driver category you want
<300 Cob/>25mhz. This usually the realm of to-220 devices - mje xxxxx or
the famous 2sa1837/2sc4793(70mhz). Rare to find an output class device in this league.
Those sankens are in the "league" , with enough 70V SOA to drive even 5
pair+ of low beta mt-200's with ease (at 2R). Try that with a TO-220 !
PS - as output devices , also a perfect match for the toshiba 2sa1837/2sc4793.
(in a EF2 configuration)
All those projects on the forum that do not take this driver/output match into
consideration are not very "robust" .
OS
Hehehe that's what I told the 2 shop owners (tho I don't understand the "wasting resources" part) but they showed me the empirical proof (which is more important than incomplete theory). The guy with the class-H amp doesn't understand electronics so he couldn't tell me the detail of the circuit (it was build-up). But the input voltage was 95Vdc.
The class-B one (at the other shop) is using thin heatsink but built on tunnel with fans at both openings. The sound level is way beyond my needs for home listening. I'm not sure it can withstand "full power" as in "on the stage" application, but he is selling the amps for PA used so what do I know.
What I meant to say is have you ever come across a transistor pair that is wildly mismatched at the DMM level (as you have described above, stating that the PNPs outside the range of the NPNs, and which is my experience too with the MJE150xx) so if for example your typical MJE150xx NPN shows hfe=90 and the typical PNP shows hfe=200 or hfe=300, what is the point in feeding them 100mA or 1A to see what will happen? They are so wildly out that you will have to find yourself a broken PNP to make it match the NPNs. FWIW I did feed them up to 1A and nothing much changed. I believe they would need to be relatively close to start with (DMM level) in order to even qualify for further testing.
The problem with my meters from atlas is that they can't deliver the current , needed for
the esd-meter( no not the esr), nice for matching smaller parts. But counterfits can't be stopped. If the large companies allready sold wrong panasonic fc's, then they're or made good or , and that's what it has to be, too little quality control.
the esd-meter( no not the esr), nice for matching smaller parts. But counterfits can't be stopped. If the large companies allready sold wrong panasonic fc's, then they're or made good or , and that's what it has to be, too little quality control.
testing genuine or not
Hi friends.
Here the test and gave me results.but interesting thing happened fake c5200/a1943 are hold on 120AC supply,but 150AC they burn imidietly and bulb stays on as you plug supply 🙂
Other are holding on 150AC voltage supply should i push them more or is it enough?Datasheet says 230v min.what voltage can be correct value to test it?In SOA says 200v like 0.05a (50ma) 🙂 do you think even original ones can hold on this?
And anyway i will not use these transistor in future.but i made mistake and bought some few time ago.
Hi friends.
Here the test and gave me results.but interesting thing happened fake c5200/a1943 are hold on 120AC supply,but 150AC they burn imidietly and bulb stays on as you plug supply 🙂
Other are holding on 150AC voltage supply should i push them more or is it enough?Datasheet says 230v min.what voltage can be correct value to test it?In SOA says 200v like 0.05a (50ma) 🙂 do you think even original ones can hold on this?
And anyway i will not use these transistor in future.but i made mistake and bought some few time ago.
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120 V ac will give a peak of 170V dc and 150 V ac will give 212 V dc . I assume the the 120V and 150V ac are measured values and not assumed values !
?This is "BONKERS"
the base current when at 120Vac is ~36mApk
That will allow ~3.5Apk when the Vce is ~170Vce and dissipate an instantaneous 600W that will repeat every 10ms.
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