• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

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

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#22
#23
SY said:
You could use an input transformer with a small step-up ratio. That would be easiest.
Click to expand...

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
 
#24
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.
 
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