A curious question, but I have a few spare EF732, miniature pentode valves as used in the Telefunken AK47 microphone. I'd like to use them on a preamp and run it with a 'warmer' sound, - so some controllable harmonic generation. Can anybody advise on the best way to do this. I'l be running at 24V rail. I thought of straddling the supply with a divider chain having a pot in the middle to bias the grid. Would this work? Is there a better way? Thanks for help in advance.
Your image is not visable, attach it via the <Go Advanced> button. When you connect it as a triode spurious distortion (mostly H2) can be derived from sub-optimal loading. Altering the anode load resistance would have the biggest effect but amplification changes accordingly.
http://www.r-type.org/pdfs/5840.pdf
http://www.r-type.org/pdfs/5840.pdf