Here's a web site that might help, http://antiqueradio.org/lil7.htm

73
Richard WB8KRN

"mac" wrote in message ...
Hello

I am looking for schematics and any other help in making one tube CW QRP
transmitter for 80m band, BATTERY operated. I think about 3s4t or 1t4t
(DL96, df96).
What is minimal anode voltage (typical is 67,5v) which I can use with
this lamp?

MAc