AVO RF sig gen HF133 - UK Vintage Radio Repair and Restoration Discussion Forum

robjkmannering · 25th Oct 2014, 10:01 pm

I bought this one valve sig gen from a forum member a couple of years ago. It had a known fault that the af modulation did not work. I used it a couple of times and then the fuse blew and it was put aside.
An hours fault finding eventually lead me to a charred resistor broken in 2 inside the neon indicator housing. It had shorted live to neutral.
One metal film resistor and all was well again.
I would now like to tackle the AF modulation issue, any ideas?

Thanks, Rob

25th Oct 2014, 10:01 pm	#1
robjkmannering Retired Dormant Member Join Date: May 2009 Location: Norwich, Norfolk, UK. Posts: 717	AVO RF sig gen HF133 I bought this one valve sig gen from a forum member a couple of years ago. It had a known fault that the af modulation did not work. I used it a couple of times and then the fuse blew and it was put aside. An hours fault finding eventually lead me to a charred resistor broken in 2 inside the neon indicator housing. It had shorted live to neutral. One metal film resistor and all was well again. I would now like to tackle the AF modulation issue, any ideas? Thanks, Rob