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looking for multicap capacitor - dual 450uF (80V) - Luxman SQ38FD

smurfer77

smurfer77

Super Member
Hi,

I usually restuff my tube amp multicap cans, but I have an amp that has flimsy plastic cap housings and I just don't think it is going to work.

For the caps in the 50uF (500V) range it is no problem to find multicaps from JJ, F&T or CE, etc. However, in an amp (Luxman SQ38FD) I have there is a dual 470uF (80V). Does anyone make something that large? My Physical limitations are ~35mm diameter and 70mm (or maybe a bit more) length.
 
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Nevermind ..Its a 4 pin/lug. ---- Not looking promising. Might have to go with axial or radial singles.
 
Tinkerbelle said:
Is there space underneath the chassis to fit two caps?
Click to expand...

There is likely space somewhere if I'm careful with picking caps, but I have never done such a thing. I don't really like the look of those additional caps stuck onto the chassis and will try to avoid that situation.

avionic said:
Nevermind ..Its a 4 pin/lug. ---- Not looking promising. Might have to go with axial or radial singles.
Click to expand...

Yeah, I kind of new that from the beginning, was just hoping someone had some magic solution.

I think I might look again at whether the old caps can be restuffed, or perhaps I can make a new shell for the radials as the old caps have just a plain black covering. I have the rest of the caps arriving this week, so when I have the machine open again I will check out the situation again...
 
shoot us a pic of chassis area cube dims.. frisco can't be devoid of USA contributors.. figure something out.

i've seen a lot of fugly looking stuff inside amps? this isn't a holly wood pic shoot like your amp is going to be published into some hall of fame. :D
 
This is a pic underneath, courtesy of HiFiDo. Most of the caps are under there mounted horizontal; two more should fit right in with that scene.

Once it is buttoned up, who looks underneath when the music is playing sweetly? :)
 
jheu02 said:
http://www.mouser.com/ProductDetail/Nichicon/UHW2A471MHD/?qs=sGAEpiMZZMtZ1n0r9vR22XrAbqid7dckOqVI%2bCgwqq3iye5iEvdlLQ==

12.5mm diameter x 40mm long. These are 100V rated since I didn't know how close to the original 80V rating the amp is running. There's also an 80V version. Most of the other caps are 16mm or larger diameter. I know you don't really want to restuff, but still may be the best option.
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Thanks John. I do want to restuff and that is what I usually do. For example see my Sansui AU-70. The issue here is that the multicaps are not in a rigid metal housing and I am not sure they filmsy and thin plastic housing of the old caps will stand up to being gutted and restuff (but I may still try this). I definitely don't want to slap a couple of extra caps under the chassis; each to their own, but contrary to some comments here I really do care what is under the hood even if nobody looks at it. And, I do regard my amps as works of art. I know that sounds a bit high and might, but I pour my sweat and love into these restorations and want to do them to the highest possible standard. I don't mind if anyone else wants to do it differently, as long as it is safe and sound.

Okay, so the Luxman is stored away for now, waiting for another project or two to be cleared, but I will soon get it out on the bench and take some pics for everyone and let folks know how this turns out.
 
Would you be able to reinforce the plastic housing of the original multi-cap and then restuff? Maybe some thin wall PVC pipe or even a cardboard tube.

I could have sworn Bob Anderson (bandersontv on YouTube) mentioned there was an outfit that would custom make any multi-caps you want but I can't find the video now. I'll keep looking.
 
OMGCat! said:
Would you be able to reinforce the plastic housing of the original multi-cap and then restuff? Maybe some thin wall PVC pipe or even a cardboard tube.

I could have sworn Bob Anderson (bandersontv on YouTube) mentioned there was an outfit that would custom make any multi-caps you want but I can't find the video now. I'll keep looking.
Click to expand...

Yeah, some kind of reinforcement is what I was thinking too... as long as I can gut the cap without ripping the casing. If you find that info about the people making custom multicaps let me know! :)
 
smurfer77 said:
Yeah, some kind of reinforcement is what I was thinking too... as long as I can gut the cap without ripping the casing. If you find that info about the people making custom multicaps let me know! :)
Click to expand...

Toilet paper roll. If it's diameter is too big, slice it lengthwise, overlap the sides to the correct diameter, and then tape/glue together. Alternatively, PVC drain pipe from a sink hookup may be the correct diameter. 35mm = 1 3/8". There should be at least 1 1/4" PVC then wrap with tape til snug in the original sleeve.
 
LOL for a moment I was reading a plumbing repair.

just going back scan.. plastic wrapped are pretty usually better rated caps. (cap abyss) wonder if these can be charged some and see if are draining off? well equally.. that would show dissipation but usually very fast discharging. So wondering if the caps are totally dead or could they be bumped with a parallel in route. bolstering current ones with v rated volts but a few uf or perhaps half the value of caps x 2 or less or more.. maybe current caps need more uf? is that plausible?

thus no messy fuss.. I've seen caps in parallel with a plastic tie wrap and glue against the orig. vertical. maybe the old caps have some balls left in them.

(again I'm not a under the box museum fashion guy. ) :D
 
Binkman said:
LOL for a moment I was reading a plumbing repair.

just going back scan.. plastic wrapped are pretty usually better rated caps. (cap abyss) wonder if these can be charged some and see if are draining off? well equally.. that would show dissipation but usually very fast discharging. So wondering if the caps are totally dead or could they be bumped with a parallel in route. bolstering current ones with v rated volts but a few uf or perhaps half the value of caps x 2 or less or more.. maybe current caps need more uf? is that plausible?

thus no messy fuss.. I've seen caps in parallel with a plastic tie wrap and glue against the orig. vertical. maybe the old caps have some balls left in them.

(again I'm not a under the box museum fashion guy. ) :D
Click to expand...

One of the multicaps has a bunch of elelectrolyte that has escaped so in this particular case I'm will replace the lot at the same time.
 
I'm not thinking we're talking about a plastic sleeve around and aluminum can...more like the older cardboard sleeves, only flimsier. Thus the need for a former of sorts to make the whole can a little more rigid.
 
Okay I've finally cleared the bench and cracked this open. The cans are more of a cardboard, not metal... covered in plastic; sorry if I wasn't clear about that. But on further inspection the cases are actually quite solid and I could probably restuff them without further reinforcement. However, now I'm curious to see if someone out there will do a custom multicap for this type of job, even though I always restuff my own usually.

avionic said:
Nevermind ..Its a 4 pin/lug. ---- Not looking promising. Might have to go with axial or radial singles.
Click to expand...
All 5 multicaps are 3-pin, common negative.
uV9yobu.jpg

While we are at it, here is the overall view;
YsrhfZF.jpg


Here is the dual 470uF (80V) cap that is the hard to find from standard multicap makers.
9STZl3l.jpg


Hipocrates said:
Maybe those guys of hayseed caps can make you a neat one.
Click to expand...
Sending them a message. Thanks. I"m confident I can restuff these after further inspection, but am curious if someone would actually make customs for it... will report back. Thanks everyone.
 
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