In addition, before doing a lot of surgery you should check the input coil "box" on the bottom of the amp and count the number of caps that are across the coils and compare that to the number you see on the schematic of a export version amp as those two 68pf caps MAY already be there. In my L7 they were....I'm thinking that some of the amps may have been fitted with the caps even though intended for the ham market....my L7 purchased used from another ham worked just fine on 10m without modification....the 10m markings were missing but the bandswitch had a 10m position (possibly opened by my previous owner)....the two additional caps didn't look like after factory additions....if you look down where those caps need to go I think it would take a three-handed miniature monkey with extra long forceps to even get them down in to position, much less solder them in....others had said they had no problems....YMMV.
So much easier to mod my brand new L-4B back in the day as it was all nice and open and the mod kit from Drake did the trick....the 10m band numbers on the front panel were delicately covered over with gray paint and a gentle rub with a pencil eraser brought them to the forefront....still chugging along since 1979 with the original tubes. 73 - Dino KL0S On Oct192011, at 1246 PM, K9sqg wrote: > Woody and Everyone, > > There are four basic things that have to be done on an L7 to get it on 10 > meters. > > 1. Bypass/remove the 10 meter filter board on the input circuit. > > 2. Remove the mechanical stop on the bandswitch; there are at least two, and > possibly more, ways in which Drake implemented it so you have to adjust your > approach commensurate with what was used on your amp. It can get ugly and be > aware of dropped parts that go into unwanted places. Use of blue "Painters' > tape" can help to catch the falling parts. > > 3. Install two 68 pf mica caps on the input circuit per the article that is > out on the Internet. I have it but don't have time right now to post the > link or reference. Removing the bandswitch shaft is necessary to do this > properly. > > 4. Adjust the 15 meter input coil as warranted. > > 73, > > Evan, K9SQG > > > -----Original Message----- > From: Woody <ko4...@gmail.com> > To: Drake List <drakelist@zerobeat.net> > Sent: Wed, Oct 19, 2011 7:40 am > Subject: [Drakelist] 10 Mtrs on a L7 > > Hello Everyone from a Very Cool "Heart of Dixie" > What has to be done to the L7 to get it to work on 10 Mtrs? Now before you > get too technical on me remember I'm Dumb as a Rock, so please explain in > lets say Electronics for Dummies mode. > Thanks > Woody > > -- > > If you forward this e-mail, please delete the forwarding history, which > includes my email address. It is a courtesy to me and to others who do not > wish to have their e-mail addresses sent all over the world. > > If you are including me in a multi-address email, please use the Bcc > feature. In your email address which will be under the TO: block. It still > sends emails the same but everyone does not see the other address only > theirs. > Thanks > "Woody" > > _______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist > _______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist
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