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| Solid-State TUBES !! |
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| peter-h:
This is old stuff but valve circuits generate lots of even harmonic distortion which sounds less harsh than the mostly odd harmonic distortion from badly designed transistor stuff. But anything that valves do one can do with transistors, fets, software, etc :) |
| Cyberdragon:
--- Quote from: peter-h on April 14, 2020, 07:35:15 pm ---But anything that valves do one can do with transistors, fets, software, etc :) --- End quote --- Except survive an EMP. >:D |
| retrolefty:
--- Quote from: Tomorokoshi on April 14, 2020, 05:16:28 pm ---I don't need solid-state tube replacements. I tracked down the problem 2D21 just fine. What I really need is a schematic for the thing. Otherwise obscuriorata is difficult to fix. --- End quote --- Boy the 2D21 brings back memories in the Air Force 66'-70'. They had a handful of them in the off-line KL-7 off-line cipher machine that were used to step the rotors. https://en.wikipedia.org/wiki/KL-7 |
| Tomorokoshi:
--- Quote from: retrolefty on April 14, 2020, 08:49:12 pm --- --- Quote from: Tomorokoshi on April 14, 2020, 05:16:28 pm ---I don't need solid-state tube replacements. I tracked down the problem 2D21 just fine. What I really need is a schematic for the thing. Otherwise obscuriorata is difficult to fix. --- End quote --- Boy the 2D21 brings back memories in the Air Force 66'-70'. They had a handful of them in the off-line KL-7 off-line cipher machine that were used to step the rotors. https://en.wikipedia.org/wiki/KL-7 --- End quote --- The failed 2D21 was in the reset circuit of a counter I'm working on. The plate shorted to the heater, so it took down the +100V supply every time it triggered. It glows a nice purple from the xenon fill when that happens. I borrowed one from the HP 405CR, where it runs the autoranging stepper, so now I need to get a couple replacements. And to think I replaced a Nixie in it only a week ago, and now I'm borrowing parts out of it already. |
| james_s:
--- Quote from: engrguy42 on April 14, 2020, 04:45:26 pm ---Anyone notice how discussions of analog stuff like scopes and tubes invariably end up with justifications like "it's like a fine wine" or "it's like driving a Bentley or a Mercedes" or dissing those who buy "cheap plastic toys from China"? Please, tell me there's more to it than that :-DD Look, if you like it just cuz you like it then admit it. No need to search for irrelevant and meaningless justifications to make it look more honorable. :-DD Reminds me of the PC techies who pee in their pants when a "faster" GPU with more fans and shiny lights comes out. Even if it's only 10% faster, with software that hasn't been developed yet. "Ooooo, more POWER !!!" --- End quote --- This just sounds to me like someone who either can't afford nice things or who has never bothered to try complaining about others who do see value in it. Have you ever driven a high end luxury car? Have you ever had good wine or an expensive steak? Have you ever used top quality tools? It has nothing to do with honor, some of us just enjoy nice stuff and I don't see what the issue is with that. Is there nothing in this world that you are enthusiastic enough about to dig into the finer nuances? Have you really never been tempted to spend more to get that extra 5%? Do you see no value in quality, fit & finish and attention to detail? Do you not appreciate the engineering and craftsmanship that goes into it? Or are you one of the masses of people who always shop purely by price and buy the cheapest stuff you can find in all categories while pretending it's as good as anything else around? I don't mindlessly "diss" people who buy cheap toys from China. I mean I also buy cheap toys from China, a lot of cheap crap is completely usable within its limitations. I do look down upon those who mindlessly sneer at anyone who can see the value in better quality equipment though. |
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