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I'll take a look when i get home but they are the standard old, large, metal, rectangular 600V caps. I tried 3-4 other similar oil caps but this pair sounded significantly better than all the rest. Maybe just lucked out with a cap that matches real well with my system or is just a really nice sounding old oil cap?

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Walt

LOL! Getting old sucks, my recollection of plate voltage was way off.

Single stage 1626 with B+ of 245v, plate load of 5.1K ohms, plate voltage is 170v.

I calculated output impedance at about 1753 ohms. Input impedance is roughly 100k (100k grid resister) although I once calculated it with miller capacitance and I think it was closer to 78k ohms. I just used 100k ohms and got 1.4uF for -3db at 1.5Hz so I rounded up to 1.5uF.

The oil caps are "Gudeman Company" oil condensors.

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Walt

Gudeman caps can be decent. There is no real ranking outside of performance in situ.

It wouldn't surprise me a bit if they are better than Jupiters in some ways. Why should Jupiter caps be great (think they are electrocube mfr)?

I would put a 1-2uf Russian KBG cap in there if forced to pick something I could snag offa ebay any day of the week.

If it is a CF, parallel a couple low volt 0.25 KBGs...I can slip you 4 if you want to experiment. I have some 2uf KBGs also.

These are not too dark and thick, just right.

Or a Sprague Vitamin Q 196P 0.47-1uf from the obsolete vintage cap sector, still one of my preferred parts after 30+ years of cap swapping.

I'd pay $150 for a cap, but it would have to be delivered by a cute young woman naked except for a fur coat, carrying a bottle of single malt scotch. And I would still demand a 30 day return privilege.

But that's just how I roll...

PS: Have you tried that Gudeman in your furnace?

Thanks for the recommendations. I think I already have some of the low value russian teflon caps. Now that I am thinking about caps again, some experimentation may be in order.

I think that is a good point, performace in situ is all that really matters. You really have to just try them in your system. Of course I have also tweaked and tuned my system with the old oil caps in situ, so the new Jupiter caps do not have the benefit of that experimentation at this point.

I remember listening to identical brand caps of different sizes (or voltage) and finding that sometimes they sound very different (and not a simple function of -3db cutoff). The 600v Hovlands sounded a lot better than equal value 400v Hovland versions.

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Walt

I have followed Wayne's (SoundMods) advice on caps on a couple of my projects with very good results.
I have not and will not spent much on costly audiophile caps, but all I can say is that Wayne's recipe sounds like music to me.