UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Trio 9R-59D restoration

Peterdee · 25th Sep 2021, 1:20 pm

Hi all
I see there are a lot of posts on this radio already, so I guess if I was to plough through all of them all my questions would be answered, but being lazy I would be truly grateful for any answers and advice regarding my questions as I progress. When I first gingerly plugged the rig in, bringing the voltage up slowly, there was a loud scratchy hum, and nothing being received except some strong broadcast stations on AM, which were very distorted. The AF gain is very scratchy, so I sprayed it with switch cleaner, but no improvement. On advice from a colleague, I replaced all the electrolytics, and now the rig is receiving some signals, but rather weakly, and distorted. My colleague suggested checking for any volts on the AF pot. There is about 1.7v on the pot but only on function switch pos 5 (ssb/cw). Looking at the cct diagram could this be a leaky R30, or C32? I haven't done any of the voltage checks yet.
Any advice would be greatly appreciated.
Regards
Peter G0JJI (PeeDee)

25th Sep 2021, 1:20 pm	#1
Peterdee Triode Join Date: Jan 2017 Location: Poole, Dorsetshire, UK. Posts: 25	Trio 9R-59D restoration Hi all I see there are a lot of posts on this radio already, so I guess if I was to plough through all of them all my questions would be answered, but being lazy I would be truly grateful for any answers and advice regarding my questions as I progress. When I first gingerly plugged the rig in, bringing the voltage up slowly, there was a loud scratchy hum, and nothing being received except some strong broadcast stations on AM, which were very distorted. The AF gain is very scratchy, so I sprayed it with switch cleaner, but no improvement. On advice from a colleague, I replaced all the electrolytics, and now the rig is receiving some signals, but rather weakly, and distorted. My colleague suggested checking for any volts on the AF pot. There is about 1.7v on the pot but only on function switch pos 5 (ssb/cw). Looking at the cct diagram could this be a leaky R30, or C32? I haven't done any of the voltage checks yet. Any advice would be greatly appreciated. Regards Peter G0JJI (PeeDee)