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

Uncle Bulgaria · 13th Mar 2019, 5:50 pm

Thanks both.

Yes Bill, I've had in mind your recommendation - unfortunately I bought the arms before your initial post on the first page! However, these longer wire pieces look crucial for engaging the springs so I'll have to re-felt them rather than use the new ones.

New problem: R35 burning.

Attached is the PSU circuit section. On 'record' the manual suggests I should have 240V on the anode of V6, the EL84 oscillator. Each time I've engaged 'Record', R35 starts smoking. I've replaced it but it was a symptom not the problem.

Could this be a valve fault, in which case are there any measurements I can do with a multimeter or AVO to check? Or where else in the circuit should I be looking?

The heads are not connected, if that matters.

13th Mar 2019, 5:50 pm	#47
Uncle Bulgaria Nonode Join Date: May 2016 Location: Cornwall, UK. Posts: 2,329	Re: Ferrograph 4A: Restoration advice needed Thanks both. Yes Bill, I've had in mind your recommendation - unfortunately I bought the arms before your initial post on the first page! However, these longer wire pieces look crucial for engaging the springs so I'll have to re-felt them rather than use the new ones. New problem: R35 burning. Attached is the PSU circuit section. On 'record' the manual suggests I should have 240V on the anode of V6, the EL84 oscillator. Each time I've engaged 'Record', R35 starts smoking. I've replaced it but it was a symptom not the problem. Could this be a valve fault, in which case are there any measurements I can do with a multimeter or AVO to check? Or where else in the circuit should I be looking? The heads are not connected, if that matters. Attached Thumbnails