All the amp gurus must still be recovering from Dayton. Bill, you didn't mention if you were testing with an antenna or a dummy load.
73 -Jim On Sun, 16 May 2010 09:19:35 -0700 (PDT), Bill Dzurilla wrote: >I opened up the amp and everything looks OK, except for one of the 25 or so >stators on the plate tuning capacitor has graffiti-like white traces on it. I >suspect this is the source of the 80m arcing, as the rotor does not the spot >with the traces on 40m and up. I have not tried the amp on 160m, but if my >theory is correct it would arc on 160 as well as 80. > >The capacitor plates are not dented or deformed in any way. > >So, do you think this is the source of the problem? If yes, is there any fix? > >73, Bill NZ5N > >--- On Fri, 5/14/10, Bill Dzurilla <[email protected]> wrote: > >> From: Bill Dzurilla <[email protected]> >> Subject: Drake L-7 arc and loose band switch knob >> To: [email protected] >> Date: Friday, May 14, 2010, 10:35 PM >> Hi, >> >> I recently acquired an L-7 amp and I tried it out >> today. I used my Pro II as the exciter and an amp >> keyer. >> >> There seems to be some problem on 80, unfortunately. >> On all bands, I started with 20 watts drive and slowly >> increased the drive while tuning for max output. When >> I got up to about 600 watts out on 80, I heard and saw >> through the meter a blue arc. This happened twice on >> 80, and I did not want to try it again. Not sure what >> this means, no arc on any other band. Any thoughts on >> what might be wrong on 80? >> >> 73, Bill NZ5N > > > > > >_______________________________________________ >Drakelist mailing list >[email protected] >http://mailman.zerobeat.net/mailman/listinfo/drakelist -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://radiojim.exofire.net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
