Re: L7 makes alot of smoke
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Bob, your exciter is a TR7 on 40M, correct? I wonder if the nasty "40M oscillation" that has been batted around here may be in play at this juncture.?
After you get the amp back to an operational condition, I would try a different radio even if you have to borrow one. Make sure any other rig especially?solid state,?can either handle the voltage and current of the L7 or use an interface. I mentioned this as I am not familiar with the keying arrangement of the L7.
Bob K9JU
On Tuesday, April 23, 2024 at 06:21:22 PM EDT, Jim Shorney <jimnu0c@...> wrote:
The tubes may have been gassy. That can happen if they are babied. You might have been able to recondition them by running them for a while at low voltage with some red in the plates. They need to get that hot for the getter materiel to scavenge the gas. That's why they can fail early if they have been babied.
73
-Jim
NU0C
On Tue, 23 Apr 2024 22:06:45 +0000 (UTC) "amfone via groups.io" <amfone20000@...> wrote: >? Wish you had another pair of 3-500Z tubes to put in. I had that problem with what looked like a new set of Eimac tubes, the red ink was perfect, the guy that sold them to me said he had just used them. I checked them with an ohm meter, no issue. I put them in the amp(L7) and in low power no issues in high power lighting struck fuse resistor fried. I took the tubes out of course and put in my old tubes and all was OK. The seller did after I found him refund my money. > > 73 Tim > WB8UHZ
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