Marconiphone 8903 Gram deck motor stops - UK Vintage Radio Repair and Restoration Discussion Forum

angus012 · 21st Jun 2020, 4:29 pm

Recently found my Great Grandfather's gramophone so am trying to restore it to working condition again. I have replaced the 1.1uF capacitor with 1uF and 0.1uF in parallel and the 1.3uF capacitor with 1uF and 0.33uF in parallel- as couldn't find exact matches online. Motor began turning but slowed down and stopped, so we took apart motor unit and replaced bearing and lubricated spindle. When we reassembled it, the motor ran perfectly at working speed, so we put the turntable on again and tried running it all together. Motor and table got up to speed perfectly for about 10s then gradually slowed down and stopped. We took the turntable off and tried running the motor again but it now won't run by itself for longer than about 5s if I start spinning it by hand. Constant humming sound from the motor when switched on so power is reaching it- not sure what's wrong! Any help would be greatly appreciated.

Angus

John10b · 21st Jun 2020, 5:55 pm

Hi welcome. There was a post from PhilG4SPZ in August 2013, on this topic who had same problem suggest you take a look. I don’t know how to link you perhaps Mod will do it.
John

Michael Maurice · 21st Jun 2020, 11:30 pm

this thread

What type of capacitors did you use?

angus012 · 22nd Jun 2020, 3:14 pm

Looked on that thread already but doesn't seem to have fixed it. Using yellow polypropylene capacitors rated at 630V AC.

angus012 · 22nd Jun 2020, 5:57 pm

Apologies- the 1uF and 0.33uF are 630V DC, 400V AC. The 0.1uF I could only find 2000V DC and 630V AC. Could this be the problem?

21st Jun 2020, 4:29 pm	#1
angus012 Diode Join Date: Jun 2020 Location: Loughborough, Leicestershire, UK. Posts: 3	Marconiphone 8903 Gram deck motor stops Recently found my Great Grandfather's gramophone so am trying to restore it to working condition again. I have replaced the 1.1uF capacitor with 1uF and 0.1uF in parallel and the 1.3uF capacitor with 1uF and 0.33uF in parallel- as couldn't find exact matches online. Motor began turning but slowed down and stopped, so we took apart motor unit and replaced bearing and lubricated spindle. When we reassembled it, the motor ran perfectly at working speed, so we put the turntable on again and tried running it all together. Motor and table got up to speed perfectly for about 10s then gradually slowed down and stopped. We took the turntable off and tried running the motor again but it now won't run by itself for longer than about 5s if I start spinning it by hand. Constant humming sound from the motor when switched on so power is reaching it- not sure what's wrong! Any help would be greatly appreciated. Angus

21st Jun 2020, 5:55 pm	#2
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Marconiphone 8903 Gram deck motor stops Hi welcome. There was a post from PhilG4SPZ in August 2013, on this topic who had same problem suggest you take a look. I don’t know how to link you perhaps Mod will do it. John

21st Jun 2020, 11:30 pm	#3
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,224	Re: Marconiphone 8903 Gram deck motor stops this thread What type of capacitors did you use? __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/

22nd Jun 2020, 3:14 pm	#4
angus012 Diode Join Date: Jun 2020 Location: Loughborough, Leicestershire, UK. Posts: 3	Re: Marconiphone 8903 Gram deck motor stops Looked on that thread already but doesn't seem to have fixed it. Using yellow polypropylene capacitors rated at 630V AC.

22nd Jun 2020, 5:57 pm	#5
angus012 Diode Join Date: Jun 2020 Location: Loughborough, Leicestershire, UK. Posts: 3	Re: Marconiphone 8903 Gram deck motor stops Apologies- the 1uF and 0.33uF are 630V DC, 400V AC. The 0.1uF I could only find 2000V DC and 630V AC. Could this be the problem?