UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Hameg HM307-3 Cleaning and Repair

OldTechFan96 · 6th Jun 2019, 12:41 pm

I replaced R310 last week because it had drifted a bit high. I have replaced it again and we are back in business! The -1000V rail is now what it should be. You were both correct about the HV breakdown.

This shows that the new BF232 and op amp are working correctly.

If I remember correctly, the last thing I did before the PSU fault was replace a zener in the CRT section. We were also investigating the lack of brightness of the CRT.

6th Jun 2019, 12:41 pm	#75
OldTechFan96 Octode Join Date: Jul 2017 Location: Newcastle Upon Tyne, Tyne & Wear, UK. Posts: 1,181	Re: Hameg HM307-3 Cleaning and Repair I replaced R310 last week because it had drifted a bit high. I have replaced it again and we are back in business! The -1000V rail is now what it should be. You were both correct about the HV breakdown. This shows that the new BF232 and op amp are working correctly. If I remember correctly, the last thing I did before the PSU fault was replace a zener in the CRT section. We were also investigating the lack of brightness of the CRT.