UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Joe_Lorenz · 12th Oct 2021, 8:04 pm

Hello,
referring to the low level on FM I'd suggest to check there is no oxidation having built up resistance on valve sockets, ECC 85 tuners can be quite sensible as well as following stages. I also have had Grundig anode resistors gone up in value so the ECC was operating on much too low anode voltage. According to the schematic, measurements of voltages are no impossible job.
You are very brave digging so deep!
Regards,Joe

12th Oct 2021, 8:04 pm	#17
Joe_Lorenz Hexode Join Date: Dec 2019 Location: Hohenroda, Eastern Hesse, Germany Posts: 460	Re: Grundig 5399/u/s Hello, referring to the low level on FM I'd suggest to check there is no oxidation having built up resistance on valve sockets, ECC 85 tuners can be quite sensible as well as following stages. I also have had Grundig anode resistors gone up in value so the ECC was operating on much too low anode voltage. According to the schematic, measurements of voltages are no impossible job. You are very brave digging so deep! Regards,Joe