5800uF/300v

[Viitalahde]

I just got a bunch of huge capacitors for free, 5800uF/300v. Brand new, probably less than 3 years old.

Is there any sensible way to use these in PSU's for tube projects? The inrush current is going to be huge. I'm thinking that these bastards should only be fed through a properly sized choke.

The voltage rating is also too low for a lot of stuff, but I remember reading that the voltage rating in electrolytics is not absolute but a function of current and voltage. The 300v rating might be stated at a given ripple current, but used at typical tube project current levels (few 10's of milliamps) we'd still be on the safe size.

Any input before I fry myself? :razz:

 

[Gus]

There is the old use a series current limit resistor and time delay relay that shorts out the resistor after a few RC.

 

[rafafredd]

Now you have to build a big tube transformerless output amp, with 16 output tubes on each channel just to use these things... :?

 

[clintrubber]

Value is so huge that you could stack two for 600V rating and still have a massive capacitance. In combination with the anyway advisable bleeder resistors to evenly distribute the voltage.

Hey, we want pics of those Faradzilla's ! :wink:

Bye,

Peter

 

[Viitalahde]

Here goes, pic taken by the guy who gave me these. I think he's around here too. :wink: I got the other caps also..

0706L might be a date code? July 2006?

[quote author="Gus"]There is the old use a series current limit resistor and time delay relay that shorts out the resistor after a few RC.[/quote]

Yep, I've done this in a console power supply to limit the current of the huge toroids. Has been working reliably.

[quote author="clintrubber"]Value is so huge that you could stack two for 600V rating and still have a massive capacitance. In combination with the anyway advisable bleeder resistors to evenly distribute the voltage.[/quote]

True. This would probably work well. The capacitance is still going to be huge.. I think the caps could easily be way smaller in a single C stage and they'd still be smoothing the DC almost as good. But hey, free capacitors!

[quote author="faradfredd"]Now you have to build a big tube transformerless output amp, with 16 output tubes on each channel just to use these things...[/quote]

Hehe, I actually thought I should do something insane with these and sell it for a good price. Say, 16x Pultec MB-1's. Or an 8-track console with a LA2A in each channel. :green:

 

[clintrubber]

[quote author="Viitalahde"]
quote="faradfredd"[/quote]
:grin:

[quote author="Viitalahde"]Hehe, I actually thought I should do something insane with these [/quote]
It's new years eve before you know it... :twisted: let me warn a friend though if you're really going to, he lives a few hours from you and I'd hate it if he would get hurt :wink:

 

[bcarso]

Those chemi-con caps are high quality. Very nice score.

 

[Viitalahde]

[quote author="bcarso"]Those chemi-con caps are high quality. Very nice score.[/quote]

Yeah, I'm going to put a pair of those 63 volters in a power supply of my new parametric EQ when I start building it. External PSU.

Talking about HQ caps.. I have a bunch of Siemens Sikorel series electrolytics for a Hypex UcD amp I need to build soon. A 100uF/10000uF cap is an impressive beast.

One Facon cap I just put in the DC heater thing I was struggling with.

 

[kooma]

glad to get them in use
we had even bigger ones, but that was more than I could carry home..

I've had loads of them, sold two boxes, but never got around building enything,
I've started cleaning our warehouse and gave rest to jaakko.
I still got some huge (mikävittuon jäähdytyssiili enkuks?) aluminium cooling profiles if anyone want em...

 

[Viitalahde]

Yeah, thanks to Kooma! :thumb:

Jäähdytysiili = heat sink, and Kooma has some pretty damn huge ones. I think you could build a radiator out of them. :green:

 

[PRR]

> Is there any sensible way to use these in PSU's for tube projects?

No. But don't let that stop you.

> The inrush current is going to be huge.

In any audio-clean power supply, first-cycles inrush current is all about winding resistance, NOT capacitance.

However 5,600uFd from a 200V 200VA transformer will touch 14A first-cycle (1N4007 is OK) but still be over 3A at 0.5 seconds (1N1007 is starting to heat), settling at 1.7A RMS for 0.5ADC load.

Use a physically large rectifier.

I think room lamp dimming will be an issue for transformers over 200VA.

Single-cap filtering will never get "small" ripple, because of stray resistance. You get far better filtering with C-R-C filtering, each cap half the size of the one. Pity you can't slice it like pepperoni.

> I remember reading that the voltage rating in electrolytics is not absolute but a function of current

Current does not matter (in audio we never pull so much current the cap heats). It is basic film-thickness breakdown. If you put 350V or 400V on this cap, at any current, it is going to blow up. And it is big enough to really plaster the room (and your face) with caustic confetti. I'd generally sneak a rating if it pleased me, say 310V on "300V" part; but on a firecracker this size I'd err way low, 280V or less.

Stacking makes sense. Two of these would support fifty 2*6L6 power amps, 2,000 Watts output (if you had a wall outlet big enough).

The temperature rating is just-good for tube amps. If you really stuffed a hundred 6L6 in a chassis, you do not want that heat flowing over the 85C caps.

 

[CJ]

Use the Low Voltage guys for a Heater Supply.

You can use the 5800's for a couple of Push Pull tubes.
Over filtering can be a problem with guitar amps.
But a home stereo?
I do not know. Never tried it.
I would imagine it would sound about the same, only with less hum.

It is fun to watch the fireworks when you get a tube failure with 16 million Joules waiting for their freedom.
Arc Welding in a vacuum is such a treat to watch.

But not the expensive output trans primary.

There is enuff juice in one of those caps to run that Lllama for a full year.
Go Green.

 

[clintrubber]

[quote author="CJ"]Go Green.[/quote]
That'd be fun indeed, using that 5800uF for the gain-pot decoupling in de Green mic-pre :wink:
Would likely make it the heaviest solid-state mic-pre...

 

[beatpoet]

Could you use one of these connected to an autotune to deliver an electric shock to a singer every time he went off key?

 

[mwkeene]

[quote author="bcarso"]Those chemi-con caps are high quality. Very nice score.[/quote]

I've been using chemi-con aluminum electrolytics almost exclusively in my PS designs. They're cheap, low-ESR, and have a high ripple current capability. There seems to be many panasonic series of caps that match almost exactly the chemi-cons in terms of specs. I wonder if panasonic and chemi-con have the same source?

-Mike