niobium capacitors

[Grog]

has anyone tried these? look an interesting alternative to Tantalum?
https://www.electronicproducts.com/audio-coupling-with-niobium-oxide-capacitors/

current stock in RS are low voltage, but price also very reasonable?

 

[John Caswell]

Just had look at these, not much use to valve/tube aficionados as they are low voltage and surface mount. Apart from that they do look interesting.
John

 

[Grog]

yes, certainly not available in the valve friendly voltages, SMT makes them trickier, but not impossible to hand solder.
they look to be like a 'better' tantalum, without the failure worries,

as an aside, I've noticed it's becoming harder to easily source good commercial capacitors for Valve projects, most of the usual suspects RS/Farnell etc now have a very limited range of Electrolytic and film caps at higher voltages.