Jupiter Copper Foil, Paper & Wax Cap Versus Jensen Cap 0.10uF 630Vdc Copper Foil Ceramic

@marish200   What you experienced is why we don't use paper and oil coupling capacitors in our products. They sound great but we've seen a good number of paper and oil caps develop a slight amount of electrical leakage (which is to say they can develop enough resistance that they don't entirely block all the DC that they are supposed to), which can mess with the bias on the output section- and cause the symptom you describe.

A capacitor that can do the same job of musical delivery is the copper foil V-Cap Teflon. No electrical leakage over time- very reliable.

I would love to hear comparisons with the Audyn TC. A relative bargain!

Bob,

Have used both Jupiter and Jensen in a number of my own amps and amps I have upgraded for friends.

would agree with jmolsberg, the Jupiter copper caps are really good souning caps; very organic sounding.

The Jensens are very similar, maybe a tad less organic, but the aluminum case is a plus.

but before you buy either, would suggest you take a look at the cap that caused your tube to fail. if the amp runs hot and there is not enough ventilation, the Jupiter and Jensen caps do not do well in a hot environment.

in one of the amps I upgraded with copper foil and wax caps, an output tube also redplated. The owner brought it back. Popped the bottom cover off and found the wax had melted and dripped out of the cap, and ran through the ventilation slots on the bottom cover. Must have made a mess on the surface the amp was sitting on.
Likely failure is the the cap eventually passed DC, or became electrically leaky.

In that hot running amp, put in the Jupiter Vintage Tone caps. Not as nice sounding as the coppers, but much more robust for hot amp applications. 

I have never had an issue with Jupiter copper foils leaking or breaking down in any way over the years.  I have with Duelund and Jensen however.  Jupiter is richer sounding than Vcaps with better meat on the bones weight and body. Vcaps are more resolving and sharper leading edges. However this resolution comes with a slightly thinner sound.