Yes, tubes please! Perhaps a few of the most common ready to use, and then if I could customize them by filling in parameters from data sheets, then I could basically have everything I need without (I suspect) too much dev work.

I'm ready to buy as soon as some common audio tubes types are added - triodes and pentodes like 12A*7 family, 6V6, 6L6, EL34, EL84, and some common diode rectifier types e.g. 5Y3. Sure, they're nonlinear and weird, but data sheets abound and we're (speaking for myself) looking more for circuit viability within normal operating ranges rather than totally accurate physical simulation.

Please consider including vacuum tube components as well as a sufficiently robust simulator for same. Please.

This is literally the reason I got this. Any updates on development?

I agree with this suggestion. If you could add a selection of diode, triode and pentode valves (tubes) then we who love to restore old radios (and other communication equipment) will be able to draw and share the circuit diagrams of many "lost" pieces of radio equipment.

Please add tubes model. Thanks

Tubes are, basically, 'Glass FETs' -- so I'm hopeful a 'Generic' vacuum tube model, as suggested, can be provided so that we can fill in the parameters from the data books to 'create' specific tube types. I am very eager for this addition. Thank you.

Would also like to see some tubes added please

This would help me, Im designing a guitar Tube/Vacuum Amp and would be great to at least model the pre-amp 12AX7 stage

Now that Korg is producing new low voltage vacuum tubes I think this becomes a necessity http://korgnutube.com/en/faq/

I would gladly fork over twice the price for tube functionality.

Maybe three or four times. Analog circuit designers are notorious for spending way too much money on tubes.

Any time frame on when this will be added? It's been 6 years now.

I agree, if this app gets support for Vacuum Tubes, I'll buy it! Analogue is all I work on.

The growth in tube amps and the interest in them should spell out the need and the profit as an app that could fill a massive hole in the market.
Maybe if you joined with electronic toolbox app all the references are already done just need to simulate signal

I would buy it if it had tubes options

It's THE feature I'm waiting for.

Until then:
One can use a n-MOSFET as substitute with 2 resistors of the same value (1-5M) from gate to drain and source, as a substitute.
It will not clip symmetrically though, but acts just like a tube below saturation.

A push-pull configuration with p- and n-MOSFET (high voltage types) a cap (between 10-100pF) and some resistors will be a substitute which you can even put into your amplifier. (symmetrical clipping).
I did it once, and it sounded OK - but produces only even harmonics.

I wood also like to have this feature in the app

Please

One more vote for valves/tubes. I modify guitar amps and design vintage style equipment.
An app like this would give me many more hours at the bench.
Perhaps a few popular tubes and, perhaps, NTC thermistors?
Let me know when it's available, please.

This is not just a requested feature, this will drive sales! You know what would be even cooler? Allow the component devices to be modeled from test equipment data: put a linear regression ML module and a bulk data field to allow example components of a high and low quality (or even failing) parameters.