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

space_charged · 17th Jul 2018, 9:56 pm

It looks like I'll probably have to replace all the top assemblies with built in 100pF caps. I have done just one IFT. The caps are built in to the top paxolin square. That is needed to hold the innards of the IFT in place so can't just be removed. Its made up of layers and careful use of a small hacksaw allows the silvered mica plates to be removed. Then the cleaned up plate is re-soldered and two 100pF silvered mica caps soldered in just below the paxolin. The resulting increase of gain is spectacular. Once all four IFTs are done there will be much more IF gain.

I know they are supposed to be 100pF "silvered mica" from the service manual.
Like to know if anyone any advice on what sort to buy?

17th Jul 2018, 9:56 pm	#40
space_charged Hexode Join Date: Dec 2014 Location: West Midlands, UK. Posts: 315	Re: IF fault on Eddystone 770R It looks like I'll probably have to replace all the top assemblies with built in 100pF caps. I have done just one IFT. The caps are built in to the top paxolin square. That is needed to hold the innards of the IFT in place so can't just be removed. Its made up of layers and careful use of a small hacksaw allows the silvered mica plates to be removed. Then the cleaned up plate is re-soldered and two 100pF silvered mica caps soldered in just below the paxolin. The resulting increase of gain is spectacular. Once all four IFTs are done there will be much more IF gain. I know they are supposed to be 100pF "silvered mica" from the service manual. Like to know if anyone any advice on what sort to buy?