Hello, I recently acquired an L-7 amp and I tried it out yesterday. I used my Pro II as the exciter, an amp keyer, and a dummy load. There seems to be some problem on 80, unfortunately. On all bands,
Thanks to all who responded on and off line. As suggested by Carl, I removed the cover and tried it again. Rig was connected to a Heathkit Cantenna dummy load. As suggested by several, I set the Load
Many thanks to all who watched the video and emailed me with ideas. I have watched it 50 times and I'm now convinced that the arc occurred in the plate cap stator that has the white graffiti-like tra
Carl and all, I may have lucked out this time. I was able to obtain full 1200 watts output on both 80 and 160 meters simply by refusing to turn the Load capacitor to less than 4.5. I left the Load ca
Apparently the guy who set a $1400 starting price on his L-B was not being as wild as we thought, as today an L-4 sold on eBay for even more ($1401 plus $89 shipping), see http://cgi.ebay.com/ws/eBay
Hi, I'm looking at the spec sheet for the 3-500Z at http://www.scottbecker.net/tube/sheets/088/3/3-500Z.pdf At the top of the second pages, it gives numbers for various parameters at different levels
Thanks for the reply, but I don't think I follow. Guess I had interpreted the spec sheet as meaning that, if you configure the tube in class B grounded grid and apply HV of 2000v, you should expect t
Does anyone have any further thoughts or comments on this? Is it OK to put the amp into WSJT service at 400 watts? 73, Bill NZ5N _______________________________________________ Amps mailing list Amps
Thanks, Lou. There is little info available about this homebrew amp so I'm just trying to be safe. Have not yet tried it in WSJT mode but tube appears normal in color during my testing so far. The
Thanks for the replies, fellows. It seems clear that the problem with this amp is that it needs higher plate voltage. Probably not cost effective to buy a new transformer, and doubtful whether it wo
In connection with my homebrew 6m 3-500Z amp that we discussed in an earlier thread, I would like to try a test with a power supply from a different amp. The homebrew amp's internal power supply has
In connection with my homebrew 6m 3-500Z amp that we discussed in an earlier thread, I would like to try a test with a power supply from a different amp. The homebrew amp's internal power supply has
Well, it seems it is OK to run the p/s without a load, but there may be other issues. What I have here is a homebrew 6m amp with a 3-500Z tube. The amp has a built-in power supply using an SB-200 tra
Tried it again. At the suggestion of folks who contacted me off-line, this time ran the Drake B- to ground through a different one ohm resistor, a resistor that is totally separate and apart from the
Hello, As you may know from my prior post, I have a homebrew 6m 3-500Z amp that I am trying to get to work with a Drake L-7 power supply, so far without success. The amp has an internal power supply,
Any Russian tube experts on this board? Picked up a homebrew GS-35B 2 meter amp, seems to be working OK, about 650 watts out with 50 watts drive from my FT-847. The anode is tuned with a piece of cop
Thanks to all who replied. I was able to extend the plunger, and output increased to 850 watts, with 50 watts drive. And I was able to find a dip. The only thing that seems odd is that the plate curr
Hello, My homebrew 6 meter 3-500Z amp has made the trip to Europe. The only visible damage was that one of the lines to the filament pin of the 3-500Z had broken off. I soldered it back on. The amp p