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Sinewave · 29th Sep 2019, 11:26 pm

So good progress so far. I replaced all of the resistors in the HT regulator last night. The crystal calibrator gets some of the HT and there was one carbon resistor there which was also out of tolerance. Generally I'm looking to replace all of the carbon ones as they do tend to go high even if by a few percent over the specification.

Tonight the LT regulator saw all of the carbon resistors replaced. The only two which were ok are R214 and R215 which are metal oxide resistors.

I just need to make checks in other areas before the valves go back in and the power goes on. Any suggestions of what else I should test before hand?

29th Sep 2019, 11:26 pm	#29
Sinewave Octode Join Date: May 2016 Location: Oxfordshire/Bucks borders, UK. Posts: 1,604	Re: Marconi TF144H/4S So good progress so far. I replaced all of the resistors in the HT regulator last night. The crystal calibrator gets some of the HT and there was one carbon resistor there which was also out of tolerance. Generally I'm looking to replace all of the carbon ones as they do tend to go high even if by a few percent over the specification. Tonight the LT regulator saw all of the carbon resistors replaced. The only two which were ok are R214 and R215 which are metal oxide resistors. I just need to make checks in other areas before the valves go back in and the power goes on. Any suggestions of what else I should test before hand? __________________ Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW.