I know nothing about the TR7, but I searched the web for "drake tr7 output power adjustment” and found this useful-looking page, with photos.
http://www.wb4hfn.com/DRAKE/DrakeArticles/TR7_ALC_Control/TR7%20ACL%20Control.htm <http://www.wb4hfn.com/DRAKE/DrakeArticles/TR7_ALC_Control/TR7%20ACL%20Control.htm> wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Jan 14, 2019, at 7:56 PM, Gary Smith <[email protected]> wrote: > > I hesitate to answer to this, it's been so > long since I had a TR7 (My 2nd rig) and my > memory of it is not clear. > > Given this disclaimer, I believe you'll > find an adjustable piece, two wafers with > a rectangular key hole in the center part > to turn it. Cap or resistance, I don't > recall what it was, but it controlled the > output and you could lower it way down or > get more than the rated output with it (at > the expense of the transistors if you > pushed it too long). > > I wish I could remember exactly where it > was, but I believe it was on the heatsink > or close to it at the back side of the > rig. Might have been blue, I'm not sure, > maybe it was accessible from the outside > of the radio, from the bottom rear? I > think I'd remember it if I saw the TR7 > again, the adjustment was in plain sight. > > I suspect if you backed it down you'll be > fine with the output from the KPA-500. > > For some time the TR7 was used for EME, > the person who bought mine was modding it > for that and perhaps in an EME group > someone might have good knowledge of the > TR7 and where this was exactly located. > > 73, > > Gary > KA1J > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
