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John, that was an amplifier that belonged to me. ?I was sent an AL1200by a person up north of here to look at, he claim the amp was was problematic. ?I told him how to pack the tube for safe trip about??300 miles. ?I got the AL1200 safely. ?I put the tube in the amp and the tube was totally dead! ?Wouldn’t do anything. ?I called the guy and told him the tube?is totally dead and I couldn’t get a lick of power out of it. ?He said it was working. ?Anyhow I said you need a new tube. ?Trying to get a new one was out of the question. ?Finding a good used one is sketchy and I wouldn’t stick my neck out. ?Bad?situation??at this point. ?Told him I would take the 1200 and give him this AL1500 of mine which was working just fine. ?Did a swap on the RF deck and he just paid less money than he’d pay for a 3cx1200a7. ?Shipped him the AL1500. ?He got it and in a while mentioned issues much like he had with the AL1200. ?I told him with two amps acting strangely it sounded like antenna or feedline issues. ?Sounded like high common mode to me. ?Told him two amps not working properly is suspect of load or something. ?Again amp working fine at time of swap. ?Ends up he sells amp to a guy. ?That guy blows up radios. ?Amp guy gets it and finds it’s got a bad tube. ?Probably arcing plate to cathode sending power back to radio. ?So who knows what happened in the interim? ?Amp eventually got another tube. A bad tube problem the cause of guy #2 problem, probably blown like the original 3cx1200?in the amp of guy #1. ?Other issues like a line filter were already installed when I got that amp. ?A harmless line filter doesn’t blow radios but was removed. ?Step start relays always have a black spot over time ?but still work, doesn’t blow radios. ?The so called train wreck amp ?worked for me no problem. ?It seems to me the that amp fell victim to the same fate as the AL1200 with a bad tube. ??
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On Saturday, October 19, 2024, 5:22 AM, John Sparkes <vk6jx1@...> wrote:
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