Audio Maintenance ez1073-pre by D_T_Music
Stripped down to it's heart and soul; the AML1073-Pre has no DI and no EQ but all the classic 1073 character you'd expect with Carnhill input and output transformers.
As a pure Pre goes it's hard to imagine anything better anywhere near the price. I've made two so far and I'd like to do about 8 more.
I haven't tried all the various low end 1073 knock-offs but I did have a BAE 1073d (with EQ) and while the AML doesn't have all the bells and whistles that the BAE has, it's also about 1/7th the cost and I don't think the BAE actually sounds any better just using the pre. If you want you can expand the AML with an EQ module and even then it would still only take up 2 slots in a 500 chassis as opposed to the 3 taken by the BAE.
I've done a lot of DIY audio and these are one of the best DIY products I've come across.
Quality of components, neat organized kit presentation, incredibly detailed step by step instructions, and the end result is a stellar sounding preamp.
If you know how to solder and you know how to use a multimeter this is a nearly fool-proof build, but I did put "ease of use" at 4 because you do still have to build it yourself.