Who makes this Pre-amp?

Ralph, do you mean if it has tube regulated voltage, e.g., using OD3/VR150 type tubes, etc., or something else? How can one visually tell if a point to point wired preamp has regulated power supply? Thanks.

Whether it is tube regulated or not should not make a difference. An effective regulator will not allow of the sawtooth waveform generated by a rectification to pass to the output. BTW, 0D3s and the like are voltage reference tubes, sort of the vacuum tube equivalent of a zener diode. They are known to make noise and so must be adequately bypassed, and generally are not of much use unless also used with an active regulator circuit, which if in a tube embodiment will have some sort of power tube involved.

It can be hard to tell if the high voltage is regulated but if there are no power devices like a transistor or tube for the task its a pretty good bet that no regulation is employed.

hoopster OP179 posts04-04-2019 1:45pm

rx8man

"Very little information on the vuja de website. Also their price points are a bit beyond me. I am looking at $3K or so max. The Don Sachs or DeHavilland look to be my alternatives."

Sorry I couldn’t help, good luck in your search.

04-04-2019 10:59am, I wrote: “Doug Sachs preamps include PCB’s..”

I meant to write: “DON Sachs preamps include PCB’s..” (emphasis added) 

I hate getting names wrong, so I apologize to Don for having done so here.

Cary Audio SL-P 05 might satisfy what you are looking for. I have one and has great SQ. 

If I recall correctly I seen a few used TRL Dude preamps that had an option volume control along with the core requirements you laid out. There are a number of rightly regarded members praise it somic capabilities..