Everyone loves this thoriated-tungsten DHT valve. I’ve only used it in a preamp and was hooked with its sound. Really warm and nice. Downside is, it’s very pricey these days and also is quite demanding from a filament perspective. You can check the characteristics here.
For those who like testing their designs with LT SPICE, I produced a model which matches really well the traced curves. Would like anyone to use this one, to drop me a note with any feedback 🙂
Here is the VT-25 spice model. Let me know how it works for you!
Hi, Ale,
Thanks for sharing. Is the curve for VT25 with regular 1.2A filament current or starved? I suppose if the filament current is reduced by 10%, then the RA will be increased by roughly the same proportion (or only slightly less)? Thanks.
Wayne