75V is a rarer value, too low for SMPS, too high for computer logic. Most likely aimed at motor and stepper motor driver modules, but for audio use it will have gone away as class-D amps with SMPS's don't need bulk capacitance except at the mains side of the SMPS. Its often easier to parallel smaller caps for lower ESR and lower ESL and better cooling.
"Computer grade" capacitors largely went away along with mainframe computers.
I see various screw-terminal capacitors still being made, but 75V and low-profile are unlikely.
Ed
I see various screw-terminal capacitors still being made, but 75V and low-profile are unlikely.
Ed
Good points Mark and Ed. The ones I find on Ebay are older than the installed caps. I will look to install maybe 4 caps. I will get one of those caps boards.
Hee, hee. Whenever I see old power transistor datasheets that say:
Designed for high power audio, disk head positioners, and other linear applications
I think:
At least disk drives are no longer the size of refrigerators! 😉
Ed
Designed for high power audio, disk head positioners, and other linear applications
I think:
At least disk drives are no longer the size of refrigerators! 😉
Ed
That’s true. A place where I worked in the 80s had I think a IBM system 36. The computer needed its own AC! The printer had it own noise case and still you couldn’t talk by it. I don’t think it saved the company any money!
Yeah, disk head positioners are little bitty SMD mosfets these days. Or part of some 768 pin IC.
Caps have just gone to snap in these days. Lifetimes and ripple current ratings can be just as high. May be possible to retrofit - possibly with a group of smaller ones in parallel to get the form factor, mounted to a PCB, with screw terminals on it.
Caps have just gone to snap in these days. Lifetimes and ripple current ratings can be just as high. May be possible to retrofit - possibly with a group of smaller ones in parallel to get the form factor, mounted to a PCB, with screw terminals on it.
48V in DC/DC converters are still common, for UPS usage. As switching frequencies have gone up, these are unlikely to use big bulk input capacitors anymore.
48V converters might use 75v caps, but 4700 uF would be a common output cap value. Three snap ins in that size in a parallel might fit.
Is that a Hafler amplifier? If so, which model? Most of the filter caps for the Transnova series were custom-ordered to fit the low-profile chassis. Which means that even when such capacitors were still being commonly manufactured, this particular package style (or shape-factor) was not available off-the-shelf. Unfortunately, I suspect this issue has side-lined a lot of these amplifiers.
Too bad they only have one left in stock
https://www.tedss.com/2020056509
This one is bigger, 3" dia. x 3 5/8" h
https://www.tedss.com/2020122199
https://www.tedss.com/2020056509
This one is bigger, 3" dia. x 3 5/8" h
https://www.tedss.com/2020122199
The found (credit to Chris) on tedss.com seems to fit your case. Not talking about the price/shipping, but be aware of the suitable height and shelf life of this rare one-piece offer.
Rick, your pictures doesn't show how well the PC board fits overall in a chassis. Otherwise, you might consider using a higher one or fitting the cap through an open hole. If the specifications are not far off, snap-in type is also a good choice.
Would you mind to tell what is the application of your module? 🤔
Rick, your pictures doesn't show how well the PC board fits overall in a chassis. Otherwise, you might consider using a higher one or fitting the cap through an open hole. If the specifications are not far off, snap-in type is also a good choice.
Would you mind to tell what is the application of your module? 🤔