good preamp for dynaco mk3 monoblocks with maggies

I myself would most definitely go with Atmasphere's suggestion.
You would then have a made for each other set-up, and very hard to beat.

Frank Van Alstine has a great mod for the Dynaco Pas 2 & 3.

If it don't glow....out it goes.

Try to find a used Doge 8.

I own a pair of the Dyna’s and have owned both the Promethius TVC and the ARC SP11. Given the choice, I would take the ARC in a heartbeat. The ARC is high gain and has a very good phono stage in it should you ever choose to use it. I’ve driven the Dyna’s passively with my Placette + phono stage without any issues but then again, that phono stage is a bit of an animal.

Zvovchik, since you are thinking of getting vinyl, you really owe it to yourself to get a tube preamp.

If you run an outboard phono section you have two problems- one is the audible effect of the additional connections (interconnect cable and the like). The other is the output level of the phono section. It may not be high enough.

A decent phono section may well set you back the same as a full function preamp.

A good active linestage can keep up with any TVC or PVC with ease. It does not have to be expensive but it does have to be built right. We started business almost 4 decades ago doing modifications on the old Dyna PAS 3 and we have continued to do so to this day. I'll just put it this way: Its possible to put a very simple circuit in the PAS 3 that will keep up with most preamps made and often for a fraction of the cost. There are tons of DIY circuits and articles out there if you want to do it yourself and have the skills.

Another preamp you can find inexpensively is the MFA Magus. Its not been around for a long time but they were a simple circuit that worked quite well.