Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Thanks for that info...

Posted by Lew (A) on January 9, 2007 at 10:43:29

In Reply to: Yes. Accepting their 1200VDC rating, I used the Silver/Oils in parafeed DC-blocking position... posted by jeffreybehr on January 9, 2007 at 09:20:42:

There is scuttlebutt that some (a few? one? who knows?) Mundorf's became unreliable after longterm use at much lower voltages, more like 200 to 400V. Nevertheless, I am growing more and more convinced to try them at the output of the phono stage in my Atma-spere MP1 preamp, where the B+ is 250V with an actual 130V at the output node. The concern is, as you know, that failure of a coupling or bypass cap can be catastrophic. It seems odd to have to worry about putting 400V or even 700V across a cap that is rated for much higher voltage. I just had two NOS Infinicaps (taken from my spare never used parts box) go bad within minutes of installation as bypass caps, despite the fact that they both tested OK on my LCR meter prior to installation. One took out my B+ supply; the other took out my B- supply. In the process, I discovered that two Audio Note copper PIOs in my parts box were also so leaky as to preclude their use. One thing about REL MIT RTX and PPFX-s, none has ever failed on me.

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