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Old 11th September 2011, 11:30 PM   #1
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Default Good power Filter Capacitors

I heard that CDE 380lx are good filter caps can anyone confirm or recommend some good caps.
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Old 12th September 2011, 12:05 AM   #2
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Panasonic TSHA and TSHB.
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Old 12th September 2011, 12:17 AM   #3
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I literally was just looking at the datasheet for the tshb from panasonic
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Old 12th September 2011, 01:30 AM   #4
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+1 on the Panasonic TS-HA (400V), TS-HB (450V), TS-UP (500V). These are all rated for transient voltage 50V higher than nominal IIRC. To be conservative, select voltage rating based on transformer secondary X 2(sqrt2) since on start up without a delay of some sort the cold tubes won't conduct and the B+ voltage can rise to 1.4 X transformer secondary voltage.

Cornell Dublier 500V caps work well also.....you want high voltage, low ESR caps. 500V caps can be hard to find.....
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Old 12th September 2011, 04:00 PM   #5
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Famous: if this is for your 350-0-350 transformer from your PSUDII thread, 500V caps are the best choice, since 350 x sqrt(2)=495V. That's what the B+ voltage will rise to when the amp is first powered on with cold filaments.

Change the current taps in your PSUD model to 1ma or .1ma each to confirm.

The 450V TS-HB's are rated for 500V surge and will probably work fine, but a 500V cap allows some margin. Exploding caps are no fun, and clearly 400V caps won't cut it with a 350-0-350 transformer.

EDIT: My post directly above should be transformer secondary x sqrt(2)......not x 2 sqrt(2).......

Last edited by boywonder; 12th September 2011 at 04:20 PM.
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Old 12th September 2011, 04:25 PM   #6
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Excellent info guys thanks!

"500V caps can be hard to find..... " This is exactly why I posted to the forum, it seems like the caps rated for 500v (illinois, f&t etc...) that a lot of websites offer I can't find datasheets for. Not to mention that I have found other threads claiming that those caps are all garbage.

I plan on having a standby switch after the reservoir cap to help against a hard start up.

Last edited by famousmockingbird; 12th September 2011 at 04:28 PM.
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Old 12th September 2011, 04:42 PM   #7
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I think I will go with the Hammond 390bx transformer 330-0-330. I think the most the reservoir cap will see is 462v so 500v caps should be fine. Here is what the psu says:
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Old 12th September 2011, 04:43 PM   #8
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I don't know about undocumented 500 VDC caps being **** but they do probably have short life rubber seals in them. The typical can cap had a life of about 7 years. I've done the 525 VDC can cap in my ST70 3 times since 1971. The MacIntosh salesman measured the amp at 7 W/ch in 1971 and told me to replace the can cap, the rectifier, and the output tubes. In 1971 I used a bundle of axial Sprague atomlytics, which needed replacing in 1981. The CDE cardboard can cap I got from Stereo cost cutters in 1981 had about 10 hours on it when It leaked this year with new output tubes. This time I used 450 vdc nichicon radials rated 2000 hours up. Been using about 20 hours a week, 4 month life test down so far. No turn on delay components, but real 5AR4 rectifier tube. Did put a 47 ohm salvage 5 watt? resistor between the rectifier & the choke to slow things down at startup. With wall voltage creeping up 10 vAC since 1961 I am not worried about having enough power.
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Last edited by indianajo; 12th September 2011 at 04:50 PM.
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Old 12th September 2011, 05:01 PM   #9
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I don't want to go against the datasheet spec of 40uf for the reservoir cap. Is 47uf pushing the envelope or should I go with 33uf? Maybe two caps in series like 47uf and 220uf with a total capacitance of 38uf?
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Old 12th September 2011, 05:47 PM   #10
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Quote:
Originally Posted by famousmockingbird View Post
I think I will go with the Hammond 390bx transformer 330-0-330. I think the most the reservoir cap will see is 462v so 500v caps should be fine. Here is what the psu says:
Hammond power transformers usually run high voltage-wise, so the advertised 330-0-330 will probably be more like 350-0-350.............

Have you checked out Edcor's transformers? Nice prices, large selection...they'll even do customs for a $40 upcharge. 4-6 week lead time though. The output voltages are pretty spot-on for Edcor.

EDCOR Electronics Corporation
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