In a message dated 3/6/05 1:40:13 PM, [EMAIL PROTECTED] writes:
> I, also,would like to build a QRP AM rig. I have the 6L6's and 1625's. > What I need is a modulation trandformer. Any suggestions, anyone? Thanks. > For a plate modulator that works great and does not require a hard-to-find transformer try the circuit described by Dale Hileman in the April 1955 issue of Radio and Television news. Heising circuit with a clever bias shifting scheme included. Hileman called it a "Reference Shift" modulator. Circuit revisited in ER #91, November 1996 with some updates for using several popular sweep tubes in place of the 807 originally employed by Hileman. Dennis D. W7QHO Glendale, CA
