Large diaphragm condenser tube preamp needed

[N2qlsradio]

Looking for 5840 tube preamp circuits. Any and all. Thanks!

 

[TheOhmBreaker]

To find schematics for a 5840 pentode preamp, take a look at Duncan's Amp Pages and TubeCAD. Old military radio schematics could be helpful too, since 5840s were often used there. You can also try using circuits designed for a 6AK5 they should work.

 

[N2qlsradio]

Thank you very much!