Fidelity RG35 radiogram running too fast. - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

John10b · 20th Nov 2019, 8:04 pm

Yes that is a puzzle, you say it’s working for now , let’s hope the “fault” doesn’t reappear.
Cheers
John

Techman · 20th Nov 2019, 11:18 pm

Glad you came back to the thread for a conformation on the original fault and how bad it actually was. It's certainly a bit of a mystery, but you would think that there must be a simple answer as to why sanding the wheel as it spun, cured the fault.

Edward Huggins · 20th Nov 2019, 11:43 pm

I doubt if sanding the idler had any effect at all. Just taking off the platter and maybe pulling the idler away from the stepped spindle and then back again was all that was needed.

Techman · 21st Nov 2019, 11:28 pm

It's a strange one, Edward. It seems he had to sand the idler several times before it actually came down to the correct speed. He says it was the same on all speeds, so in that case the question that I would ask is was it too fast on 78rpm, as beyond that pulley step there's nowhere else to go if it really was riding on the wrong step.

vidjoman · 22nd Nov 2019, 10:07 am

I've had several BSR decks that have slightly sticky stepping mechs where the grease/oil has caused it to not cleanly change speed and the idler rests between steps. It almost always runs on the faster step. Just taking the mech apart and playing with it will sometimes get it working but the fault will return. It needs a careful strip and clean then re-grease to work smoothly. Unless the idler is hard and slippery - sanding will not make any difference.

20th Nov 2019, 8:04 pm	#21
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,887	Re: Fidelity RG35 radiogram running too fast. Yes that is a puzzle, you say it’s working for now , let’s hope the “fault” doesn’t reappear. Cheers John

20th Nov 2019, 11:18 pm	#22
Techman Dekatron Join Date: Nov 2009 Location: Lincolnshire, UK. Posts: 5,000	Re: Fidelity RG35 radiogram running too fast. Glad you came back to the thread for a conformation on the original fault and how bad it actually was. It's certainly a bit of a mystery, but you would think that there must be a simple answer as to why sanding the wheel as it spun, cured the fault.

20th Nov 2019, 11:43 pm	#23
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,335	Re: Fidelity RG35 radiogram running too fast. I doubt if sanding the idler had any effect at all. Just taking off the platter and maybe pulling the idler away from the stepped spindle and then back again was all that was needed. __________________ Edward.

21st Nov 2019, 11:28 pm	#24
Techman Dekatron Join Date: Nov 2009 Location: Lincolnshire, UK. Posts: 5,000	Re: Fidelity RG35 radiogram running too fast. It's a strange one, Edward. It seems he had to sand the idler several times before it actually came down to the correct speed. He says it was the same on all speeds, so in that case the question that I would ask is was it too fast on 78rpm, as beyond that pulley step there's nowhere else to go if it really was riding on the wrong step.

22nd Nov 2019, 10:07 am	#25
vidjoman Dekatron Join Date: Jun 2013 Location: East Sussex, UK. Posts: 3,326	Re: Fidelity RG35 radiogram running too fast. I've had several BSR decks that have slightly sticky stepping mechs where the grease/oil has caused it to not cleanly change speed and the idler rests between steps. It almost always runs on the faster step. Just taking the mech apart and playing with it will sometimes get it working but the fault will return. It needs a careful strip and clean then re-grease to work smoothly. Unless the idler is hard and slippery - sanding will not make any difference.