I have an L7 run on 120VAC and have used it on 160M many times. I only drive it with about 50W and it gives me about 450W out, same as the other bands. Never had an issue and the fan doesn't even come on at that power level. I have never run it at higher power because I don't have 220V in the shack. The tubes are very old and predate my ownership by a great deal.
On Tue, Mar 16, 2010 at 3:41 PM, <[email protected]> wrote: > > Fellow enthusiasts, > > Wonder if anybody has had "bad" experiences with the Drake L7 on 160 > meters. I'm checking one out for a local ham that needs some assistance and > have found some strange things, some, but not likely all. The amp seems to > have been, how do we say it, "worked on". Everything seems to be ok except > on 160 meters. Original tubes in the amp were soft, so I put in a known set > that were good, and that didn't change things in terms of the problem on > 160. > > Here is the test setup. Using a dummy load with 1:1 SWR. Power supply > is fine. No parasitics observed. Driving with a TR-7 (tests at 50 and 100 > watts). SWR to the input of the amp is less than 1.2:1 so the input coil > is reasonably well adjusted. Power out is only 500-600 watts DC on a > calibrated wattmeter. Other bands, like 80 and 40, produce closer to 900 > watts DC output. Typically the power goes down as you go higher in > frequency, which happens here on 80-15 meters, but 160 is way down. > > Has anybody experienced anything like this with their L7? Inquiring > minds want to know. > > 73, > > Evan, K9SQG > > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist > >
_______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
