Well i blew up my 895A, and without the service manual it ain't looking good. But, to be fair, who ever heard of progress without sacrifice? I am learning vacuum tubes after all, like just then i learned what NOT to do.
Unlike solid state stuff vacuum tubes are pretty robust and you really have to try hard to fatally blow them up. What did you do?
Tubes are quite easy to blow up from experience, at least when in my hands
Labels 4 Mnementh including the point at which smoke may begin .
Mooning shot for Specmaster. Short riser block/mount for the pair of fans to be made when they arrive.That's a good mooning shot, good air flow assured [emoji16]
Bet yours was just a bit faster to make too
Continuing on with Passive Projects, getting back to my CapKilla. 3D Printed Case, Trashy evilbay 250 50W Resistors, junk meter leads I had in a box, DPDT Switch to throw the bank from 250 - 1k at the outputs. Not shown is the leftovers of a $10 Clampmeter I am going to drop across the leads so I know when it is dead. There is no such thing as overkill
edit: Labels fitted before Mnementh has a SOOK
Since when do you need multiple 50 watt resistors to discharge capacitors? You planning on going to the local power substation and play with HV?
There is NO SUCH THING AS OVERKILL
If you do the numbers the instantaneous inrush current is heaps. Throw some numbers here http://mustcalculate.com/electronics/capacitorchargeanddischarge.php?vfrom=600&vto=2&vs=0&c=.001&r=1000&time=30 It doesn't take much of a Cap at a few hundred volts to peak 500W+ depending on the resistor used. The 250 setting for dropping Fat low voltage Caps will speed it up. So an all in one.
The main reason to do it is the LCR Tweezers I own will smoke above a few volts.
Well i blew up my 895A, and without the service manual it ain't looking good. But, to be fair, who ever heard of progress without sacrifice? I am learning vacuum tubes after all, like just then i learned what NOT to do.
Tubes are quite easy to blow up from experience, at least when in my handsAnything in your hands blows up.
I was going to roll a 3DP mount for the fans so it would be easy to make them separately baffled. While I wait for the others to arrive I can have a go at in and out with the one I have and load it up without the speed holes in the case.
2430 Digital (Top) vs 2465 Analog (Bottom). Both in the 1986 Tek catalog. 2430 b/w 150MHz. 2465 b/w 300MHz. One must have really wanted a DSO in 1986. Why? 2430 cost $8900 USD. 2465 cost $5350 USD. Quite a difference.
Well yeah... the ability to capture nonrepetitive events was a game-changer back then; one of the Holy Grails of scope design. Along with ever-shorter risetimes, which was one of the 24xx series strong points.
Looks beautiful to me... empirical proof that DSO and CRO can not only peacefully coexist, but will in many cases happily cohabitate as well.
mnem
"No electron gun, no sale." ~ old man Kirsch
Well yeah... the ability to capture nonrepetitive events was a game-changer back then; one of the Holy Grails of scope design. Along with ever-shorter risetimes, which was one of the 24xx series strong points.Very true even though it's memory capacity is laughable by today's standards.
2430 Digital (Top) vs 2465 Analog (Bottom). Both in the 1986 Tek catalog. 2430 b/w 150MHz. 2465 b/w 300MHz. One must have really wanted a DSO in 1986. Why? 2430 cost $8900 USD. 2465 cost $5350 USD. Quite a difference.
Well yeah... the ability to capture nonrepetitive events was a game-changer back then; one of the Holy Grails of scope design.
Well yeah... the ability to capture nonrepetitive events was a game-changer back then; one of the Holy Grails of scope design. Along with ever-shorter risetimes, which was one of the 24xx series strong points.Very true even though it's memory capacity is laughable by today's standards.
Yeah... looking at the developments in RAM technology over the decades, it boggles my mind that they were able to make RAM fast enough with ANY usable depth to do this.
I think that's because most of the early digital storage ones were crap! Case in point, this horrid thing which passed through my hands very quickly:
Been playing with 10MHz OCXO's and wanted another dedicated power supply I could run for some long term testing. Found what looked to be a clean, late version HP 6227B (0-25v, 0-2A, dual channel) on eBay not to far from me. This was the only test equipment item in the sellers store, so I made an offer for $75 from the $135 asking and they accepted. Shipped fast, and very well packaged which was a pleasant surprise. Its in better shape than I had hopped for, appears 100% original and no signs of any work. I am seeing some ripple at max load, more so from the main channel. The main filter bank caps do appear week, and C10 on the master regulator board needs to be replaced, but this is to be expected. The hunt is on for some caps, but well worth it for such a nice peace of gear, they don't make things like they use to.
I think that's because most of the early digital storage ones were crap! Case in point, this horrid thing which passed through my hands very quickly:
Yes indeed. Stunning ADC (and DAC) improvements have been made since the early/mid 90s. That was one of the disappointingly few major differences when I returned to electronics a few years ago. (Nanopower is the other).
I think that's because most of the early digital storage ones were crap! Case in point, this horrid thing which passed through my hands very quickly:
Yes indeed. Stunning ADC (and DAC) improvements have been made since the early/mid 90s. That was one of the disappointingly few major differences when I returned to electronics a few years ago. (Nanopower is the other).
At the same time it has led to "commidity integration" where every device is the same digital ARM black blob with some light weight analogue interfaces around the edge. As always I'm too late to the party to enjoy the good bits.