Most of the advances IMO are in the next gen HE required and smaller trigger devices. But, the underground tests data characterized and predicted weapon design so well in developing computer models, that a 'ban' on testing could be done. Now it is all designed in computer models/SIM design. Further modelling is done thru plasma research studies (fusion experiments, etc). Lots of new nuclear toys now... ones with enhanced radiation. Different types of radiation. Ones without radiation. Etc. If we wish, we can kill every living thing in a city without destroying the buildings and infrastructure... with short-lived radiation. What fun the next Big One will be.
We live in interesting times.
-RNM
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It is not the big guys I worry about. It is the small single stage device with only partial yields.
Nuclear weapons , is definitely stupidest human invention of all times,
My father was Corps of Engineers stationed on Okinawa Japan preparing for the invasion of Japan. Casualty rate on the European Omaha Beach landings was 41% for the Corps. It was expected to be much higher in Japan.
The simulation models show a very low Vaf for all but the BFSR19A and the BF821. Almost all of the rest of the transistors have a Vaf of ~20. Since Phillips didn't bother putting charts in the datasheets those of us who haven't used them are left to speculate that they really are that bad.
which are the remaining transistors that are good compl pairs with low C and high voltage and low Vaf?
THx-RNMarsh
These are very, very old devices that targeted TV applications and not audio.
I think Philips Semiconductors, now NXP, never got to be one of the biggest suppliers into the auto and banking industries (your credit card is NXP powered) with shitty data sheets.
Cheap shot in my view.
I don't see any good NXP transistors we don't already know about, and it's still possible the models are wrong and the BFR's have high Vaf. It would be nice if someone could confirm this.
My goodness - a lot of JFET's in there.
Did you consider going parallel single ended:-
-potentially less noise - BF862 is the lowest noise JFET available at <1nV/rt Hz with very low 1/f corner. Parallel 8 of 'em and you are in <0.3nV/rt Hz territory. They cost pennies at Mouser
-second harmonic dominates the distortion spectra - not odds - pleasing sonic signature
- certainly easier to source parts
- marry to a good quality 'Scottie' (aka AD797) and all active feedback RIAA EQ for >35dB OLM
- = best of all worlds
See Syn08's website for inspiration and Dennis Colin's LP797 for a good primer.
more l8r
Did you consider going parallel single ended:-
-potentially less noise - BF862 is the lowest noise JFET available at <1nV/rt Hz with very low 1/f corner. Parallel 8 of 'em and you are in <0.3nV/rt Hz territory. They cost pennies at Mouser
-second harmonic dominates the distortion spectra - not odds - pleasing sonic signature
- certainly easier to source parts
- marry to a good quality 'Scottie' (aka AD797) and all active feedback RIAA EQ for >35dB OLM
- = best of all worlds
See Syn08's website for inspiration and Dennis Colin's LP797 for a good primer.
more l8r
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