Cossor MM 501AC Live or Neutral? - UK Vintage Radio Repair and Restoration Discussion Forum

Oldelectronics · 20th Apr 2017, 7:57 pm

Hi the Cosser MM 501AC I am currently working on ( Which appears to have been previously worked on this is the one with some components covered in black cloth backed tape!previous post) It has neutral going to the on off switch then to a tapping I assume at one end of the primary of the MT the live lead goes to the transformer directly then to the voltage selector press studs at the other end of the primary. I will be fitting a mains earth to this. Is it normal practice to swap this round ie live to the switch and neutral to the transformer on this model. Or is it best to leave as is?

Regards

Kev

Cobaltblue · 20th Apr 2017, 8:12 pm

ISTR that switching in the neutral is normal on this set.

The live going to the voltage selector.

As its a transformer isolated set it in reality makes no difference.

Although the original mains lead has red and black cores a lot of these sets would originally had 2 pin mains connectors meaning there was a 50/50 chance which way around it would be plugged in.

IMHO leave as it is and connect the Earth to the chassis

Cheers

Mike T

Oldelectronics · 20th Apr 2017, 8:31 pm

Thanks Mike much appreciated.

regards

Kev

20th Apr 2017, 7:57 pm	#1
Oldelectronics Heptode Join Date: Jan 2016 Location: Nottinghamshire, UK. Posts: 676	Cossor MM 501AC Live or Neutral? Hi the Cosser MM 501AC I am currently working on ( Which appears to have been previously worked on this is the one with some components covered in black cloth backed tape!previous post) It has neutral going to the on off switch then to a tapping I assume at one end of the primary of the MT the live lead goes to the transformer directly then to the voltage selector press studs at the other end of the primary. I will be fitting a mains earth to this. Is it normal practice to swap this round ie live to the switch and neutral to the transformer on this model. Or is it best to leave as is? Regards Kev Attached Thumbnails

20th Apr 2017, 8:12 pm	#2
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,865	Re: Cosser MM 501AC Live or Neutral? ISTR that switching in the neutral is normal on this set. The live going to the voltage selector. As its a transformer isolated set it in reality makes no difference. Although the original mains lead has red and black cores a lot of these sets would originally had 2 pin mains connectors meaning there was a 50/50 chance which way around it would be plugged in. IMHO leave as it is and connect the Earth to the chassis Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

20th Apr 2017, 8:31 pm	#3
Oldelectronics Heptode Join Date: Jan 2016 Location: Nottinghamshire, UK. Posts: 676	Re: Cosser MM 501AC Live or Neutral? Thanks Mike much appreciated. regards Kev