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Yes, you are completly sure, it was indeed a failed tube that damaged the resistance. Thanks and 73!

Yes, there was a resistance that did not make contact.

Unfortunately the KUP14D15 it's not in stock, but I found another 8-pin relay for 20Amp 12V, I think it's pretty good.

Many thanks for the reply. I understand that this relay has to be replaced, because of it my IC-7300 had to take one of the transistors from the final stage, but in Portugal it will be impossible to buy it, I'll do a search on the internet. Thank you again. 73! I found a site where they sell...

When I went to remove 3 valves, leaving only one connected, I noticed that the RX TX relay was glued to TX. I think I found the fault. There didn't seem to be any burnt resistances. Now that I've bought new tubes, I'm afraid to test the amp.

Thanks for the answer. I will do it.

Thanks for the answer. Plate currente a litle more than 625mA Plate voltage 1700V (1.7KV) Plate current 75mA

I bought an Ameritron AL-811H to a colleague and he warned me that the amplifier had a problem, the problem is even with no drive it shows about 40 mA of grid current. Please help me, thanks.