microphone tube preamp

[mirza]

does any1 have schematic of something like this? with pcb maybe?
thnx a lat

[Mike Burgundy]

What do you want, exactly?
Paia has a "tube mic pre" That runs on low-voltage and uses a hybrid design, using the tube to "warm things up".
There are also a LOT of good tube mic preamp designs out there for sale or DIY (do a search on Gyraf audio). Also check out the Jensen site (transformer manufacturer with good example schems)
Old Altec stuff is simple but okay, too.

The problem is IMHO a tube mic pre only makes sense if you also use *very* good in-and output transformers which are very expensive. See Jensen, for those.
Once you have the transformers, it's basically a low-noise amp, maybe with added phase switching, phantom power and ground lift...
I wouldn't build anything with tubes on a PCB - these things get HOT and pcb material doesn't like that.

[mirza]

all i want is "warm things up".....sound...not pcb

[The Landlord is Dead]

take a look at the G9 http://www.gyraf.dk/
PCB available here http://www.prodigy-pro.com/forum/viewtopic.php?t=233