UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Racal 9081 SSG No FM but he meter reads OK

Markany · 1st Feb 2018, 4:10 pm

Hi All

Just to let you know the unit is now fixed thanks to those diagrams, in the end i have three different circuits and finally matched up what was what. It would be nice to have the extra board layouts but the circuit is much more important.

The fault was three of the 24v rails down with SC caps and burned out resisters. Once i worked out how the unit functioned the red herrings of meter fine but no output and also the buffer amp having input but no output were ignored.

Basically the buffer amp has gain control and that was shut hard off due tot he loss of rails further upstream.

I now have two of these fine machines in working order, well until more caps go of course.

Regards

Mark

1st Feb 2018, 4:10 pm	#5
Markany Retired Dormant Member Join Date: Jan 2018 Location: Andover, Hampshire, UK. Posts: 4	Re: Racal 9081 SSG No FM but he meter reads OK Hi All Just to let you know the unit is now fixed thanks to those diagrams, in the end i have three different circuits and finally matched up what was what. It would be nice to have the extra board layouts but the circuit is much more important. The fault was three of the 24v rails down with SC caps and burned out resisters. Once i worked out how the unit functioned the red herrings of meter fine but no output and also the buffer amp having input but no output were ignored. Basically the buffer amp has gain control and that was shut hard off due tot he loss of rails further upstream. I now have two of these fine machines in working order, well until more caps go of course. Regards Mark