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Airhead-
Lol, a £2.99 tone control off eBay and some switches would probably do a similar job, such is the quality of even the cheapest modern components*. So this cost around a factor of 30 more to build and probably draws around 20W compared to maybe 0.5W?!
But it does sound so sweet. Can recommend an old Mullard if you have a big setup, especially paper cones on a valve or mosfet amp.
Jonny69
Been building a Mullard ‘two-valve’ preamp in my lunchtimes (build thread with almost no replies on Retro Rides if you’re interested). I’ve modified the circuit slightly so that the inputs have slightly different levels of amplification and the overall signal output has a slight gain to suit the big input wanted by both of my amps. Got it up and running and it sounds fabulous with my huge speakers. It’s got enormous bollocks because I didn’t put a rumble filter on it. Only thing I’m going to change now is the capacitors on the bass part on the tone control so it comes in and out at a lower frequency. Currently starts a gentle slope at about 1khz with full gain at about 30hz. So it’s got quite an old-fashioned sound, but I’m looking for it to start at maybe 500hz. I’ll start there by doubling the cap values and see what it sounds like.