Oxxford Instruments 2137 MPSU - UK Vintage Radio Repair and Restoration Discussion Forum

Herald1360 · 20th Jan 2019, 2:11 pm

Just found this whilst poking about looking for HMV 2126 (I guess it came up because there was a 2126 MPSU too).

It's a unit I worked on the design of back in the early '80s used for running up an early OXFORD superconducting MRI magnet.

Bit of nostalgia and nice to hear it still works after 36 years in service!

https://www.ebay.co.uk/itm/OXFORD-IN...-/231942077875

It's a conventional 3-phase rectified choke input filter basic supply with a watercooled linear regulator (about 50 RCS258s if I recall). The Hubbell mains inlet looks like an aftermarket fit- the original probably wouldn't have met with UL approval. It has a control unit with a switched rate sweep generator and operates in variable constant current mode with a two volt compliance limit.

Craig Sawyers · 20th Jan 2019, 5:52 pm

Who was running OMT back then? I ran engineering at the Research Instruments Division during the 90's - worked for John Pilcher.

Herald1360 · 20th Jan 2019, 10:56 pm

I think it was Nick Randall.

The 2137 was a development of the 2115 150A 10V unit used on an OI magnet and was developed before the electronics dept I was in was transferred to OMT around 1984. We lived away from the Osney Mead site out at the ARC site at Wootton before OMT moved en masse out to the new Eynsham factory. Roger Littlewood was electronics manager who I believe reported to JP. There was a whole bunch of them that drank in the Greyhound ISTR.

20th Jan 2019, 2:11 pm	#1
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Oxxford Instruments 2137 MPSU Just found this whilst poking about looking for HMV 2126 (I guess it came up because there was a 2126 MPSU too). It's a unit I worked on the design of back in the early '80s used for running up an early OXFORD superconducting MRI magnet. Bit of nostalgia and nice to hear it still works after 36 years in service! https://www.ebay.co.uk/itm/OXFORD-IN...-/231942077875 It's a conventional 3-phase rectified choke input filter basic supply with a watercooled linear regulator (about 50 RCS258s if I recall). The Hubbell mains inlet looks like an aftermarket fit- the original probably wouldn't have met with UL approval. It has a control unit with a switched rate sweep generator and operates in variable constant current mode with a two volt compliance limit. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

20th Jan 2019, 5:52 pm	#2
Craig Sawyers Dekatron Join Date: Nov 2010 Location: Oxford, UK. Posts: 4,982	Re: Oxxford Instruments 2137 MPSU Who was running OMT back then? I ran engineering at the Research Instruments Division during the 90's - worked for John Pilcher.

20th Jan 2019, 10:56 pm	#3
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: Oxxford Instruments 2137 MPSU I think it was Nick Randall. The 2137 was a development of the 2115 150A 10V unit used on an OI magnet and was developed before the electronics dept I was in was transferred to OMT around 1984. We lived away from the Osney Mead site out at the ARC site at Wootton before OMT moved en masse out to the new Eynsham factory. Roger Littlewood was electronics manager who I believe reported to JP. There was a whole bunch of them that drank in the Greyhound ISTR. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O