Line stage preamp, based on SY's "Heretical Unity gain line stage"

[SY]

No, it's a full redesign if you want gain higher than unity.

 

[Danko]

Okay, you convinced me!

here are some pictures!

http://sziget.mine.nu/~danko/aramkor/amp-for-danko-tube-preamp/dscn7257.jpg
http://sziget.mine.nu/~danko/aramkor/amp-for-danko-tube-preamp/dscn7256.jpg
http://sziget.mine.nu/~danko/aramkor/amp-for-danko-tube-preamp/dscn7253.jpg
http://sziget.mine.nu/~danko/aramkor/amp-for-danko-tube-preamp/dscn7252.jpg
http://sziget.mine.nu/~danko/aramkor/amp-for-danko-tube-preamp/dscn7251.jpg =-> state of the art wiring

 

[Steve Eddy]

You could use an input transformer with a small step-up ratio. That would be easiest.

Here's a schematic for both 1:2 and 1:5 step up transformers with the RC network values optimized for 10k and 50k loads so they can be used with standard potentiometer values.

For a 1:10 like the CineMag CMMI-10C, just load it with 100k and no RC network.

An externally hosted image should be here but it was not working when we last tested it.

se

 

[rdf]

Many thanks for the transformer info, I've been looking for exactly this but passed by those marked as microphone step-ups. Any concerns about running the Cinemag's at consumer audio level? Are they conservatively rated? Thanks again in advance.