RM2 Metal Rectifier - UK Vintage Radio Repair and Restoration Discussion Forum

saddlestone-man · 12th Jan 2015, 2:43 pm

Does anyone have the voltage and current spec for the RM2?

best regards ... Stef

M0FYA Andy · 12th Jan 2015, 3:18 pm

Is that the Brimar SenTerCel RM2?
If so, my datasheet says RMS input per unit, 125v max, DC Disc to Rivet voltage, 700v max, and DC output 100mA.
Andy

saddlestone-man · 12th Jan 2015, 4:25 pm

Hi Andy

That sounds like the right one. My Barton's radio has two in series, fed from the mains, so the voltage rating makes sense. I'm about to find out soon if they are still functioning.

best regards ... Stef

Neil Purling · 31st May 2016, 10:26 am

What were the forward & reverse resistance measurements of them when new?
I pulled a pair off another kit radio that measured infinty one way. The other way each assembly had a different resistance: One was 348K, the other 1.38M.
I was thinking of dismantling the rectifiers and replacing all washers with insulators and wiring a diode across the tags. However... It looks like there is no way of dismantling these Brimar RM2.
I might see if I can dismantle one of those flat contact-cooled type to hide a diode inside, which would have the appearance of a later repair.

12th Jan 2015, 2:43 pm	#1
saddlestone-man Hexode Join Date: Mar 2009 Location: Cirencester, Gloucestershire, UK. Posts: 391	RM2 Metal Rectifier Does anyone have the voltage and current spec for the RM2? best regards ... Stef

12th Jan 2015, 3:18 pm	#2
M0FYA Andy Nonode Join Date: May 2007 Location: Preston, Lancashire, UK. Posts: 2,511	Re: RM2 Metal Rectifier Is that the Brimar SenTerCel RM2? If so, my datasheet says RMS input per unit, 125v max, DC Disc to Rivet voltage, 700v max, and DC output 100mA. Andy

12th Jan 2015, 4:25 pm	#3
saddlestone-man Hexode Join Date: Mar 2009 Location: Cirencester, Gloucestershire, UK. Posts: 391	Re: RM2 Metal Rectifier Hi Andy That sounds like the right one. My Barton's radio has two in series, fed from the mains, so the voltage rating makes sense. I'm about to find out soon if they are still functioning. best regards ... Stef

31st May 2016, 10:26 am	#4
Neil Purling Nonode Join Date: Jul 2005 Location: Hull, East Yorkshire, UK. Posts: 2,087	Re: RM2 Metal Rectifier What were the forward & reverse resistance measurements of them when new? I pulled a pair off another kit radio that measured infinty one way. The other way each assembly had a different resistance: One was 348K, the other 1.38M. I was thinking of dismantling the rectifiers and replacing all washers with insulators and wiring a diode across the tags. However... It looks like there is no way of dismantling these Brimar RM2. I might see if I can dismantle one of those flat contact-cooled type to hide a diode inside, which would have the appearance of a later repair.