Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: cyborg_stew on March 02, 2020, 01:52:53 pm
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I'm looking to replace the original filter caps on my '78 Princeton. Has anyone had any bad experiences with the CE cans? I am skeptical to use it, since they're only rated at 55C or 65C, and the original can is 85C. I don't wanna install something that isn't going to last, or even worse, have the possibility of damaging the amp.
But, on the other hand, I think that if they are billed as a direct replacement for amps like mine, then they must be reliable. Any thoughts? Thanks!
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pricey but they do work well.
--pete
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I put a CE 30/20/20/20µF @ 525V 55°C in my Sunn Sceptre back in 2006. Still running fine.
You do realize that 55°C is 131°F, right? That's pretty hot. However that Princeton will retain heat just because of the way the chassis is mounted in that combo cab. I would not hesitate to use it though. If you really want to know how hot your amp gets just tape an oven thermometer to your cap can.
But if you are really concerned about that 55°C operating temp spec, you could use the JJ 40/20/20/20 can that's rated for 70°C and only $16. But it will not fit the Mallory mounting cutout. It needs a 1-3/8" or 1-1/2" hole and a clamp. You will have to modify the chassis to mount it.
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Thanks guys! I'm not too concerned about it. I was told that the temp rating has more to do with the current that's passing thru the components, rather than the ambient temperature in the amp. It certainly does get hot in there though.
I've seen the JJ's, and the price seems much more reasonable. But I'm not looking to drill holes in the chassis. Plus, the CE cans look more like the originals.
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Have used CE's in Princeton, Champ & numerous other amps including 100 watters. Work fine.
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I was told that the temp rating has more to do with the current that's passing thru the components, rather than the ambient temperature in the amp.
If a cap or even a cap can is generating any heat, it is failing.
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I was told that the temp rating has more to do with the current that's passing thru the components, rather than the ambient temperature in the amp.
If a cap or even a cap can is generating any heat, it is failing.
And it you hear a sound like something is stretching, it's very close to stinking the place up too.
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but no worries, it's just confetti :icon_biggrin: