UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - U12 Rectifier

Paul JD · 15th Mar 2019, 5:17 pm

I had a similar problem with a U12 in a GEC AC37 a while ago. It had the purple glow but in my case it didn't blow the fuse, it just didn't work (there was no HT voltage).

As a temporary fix I removed the base from the failed valve and mounted a couple of diodes and a suitable dropping resistor to the valve base so it could be plugged in in place of the valve. Of course several months later the "temporary" fix is still in place!

15th Mar 2019, 5:17 pm	#12
Paul JD Pentode Join Date: Oct 2018 Location: Coventry, West Midlands, UK. Posts: 220	Re: U12 Rectifier - purple flash I had a similar problem with a U12 in a GEC AC37 a while ago. It had the purple glow but in my case it didn't blow the fuse, it just didn't work (there was no HT voltage). As a temporary fix I removed the base from the failed valve and mounted a couple of diodes and a suitable dropping resistor to the valve base so it could be plugged in in place of the valve. Of course several months later the "temporary" fix is still in place!