Help Identifying Thorn LOPT and EHT rectifier - UK Vintage Radio Repair and Restoration Discussion Forum

Philips210 · 10th Apr 2013, 2:14 pm

Hi.

A colleague has a Thorn LOPT and a Thorn EHT rectifier unit each from a different chassis but is unable to identify them.

The EHT unit only has two leads so I'm thinking a simple half-wave rectifier as in a small screen set. I wondered if it was from a Thorn 900 (later version). I looked at the possibility of a 981 chassis but I think that EHT unit is physically different.

He suggested the LOPT could be from a 1600 or later series.
Attached are a couple of photos.

Any help on identifying these two parts would be a great help.

Regards
Symon

Nicklyons2 · 10th Apr 2013, 2:29 pm

LOPT looks a bit like the 1591 portable to me. EHT doesn't ring any bells I'm afraid.

dazzlevision · 10th Apr 2013, 3:46 pm

Hello,

Are there no markings at all on these two units?

The LOPT is a Plessey made type and usually has a label on it with the Plessey part number (such as PLY 65/003). It does look like the type fitted in the Thorn 1590/1591 chassis.

The rather small EHT rectifier could be for the Thorn 8000 colour TV chassis (the plug on it is the same type as the one on the Thorn 8500 EHT rectifier module) and it may have (depending on the actual maker of the unit) the following part numbers on them: TS20-11HAA, 9OM4-024 or E22A.

Regards,

Dazzlevision

Philips210 · 10th Apr 2013, 8:02 pm

Hi.

There is an ID number on the LOPT, this being PLY 69/000.

It certainly looks similar to a 1590/1 type but the one in the pic is obviously missing it's stick rectifier. I suppose new 1590 LOPTs were supplied without this and would thus have to be transferred over from the old LOPT.

Thanks so far for your replies.

Regards
Symon.

HamishBoxer · 10th Apr 2013, 8:08 pm

I would have said Thorn 8000 as i used to repair these many moons ago.

10th Apr 2013, 2:14 pm	#1
Philips210 Nonode Join Date: May 2007 Location: Redruth, Cornwall, UK. Posts: 2,579	Help Identifying Thorn LOPT and EHT rectifier Hi. A colleague has a Thorn LOPT and a Thorn EHT rectifier unit each from a different chassis but is unable to identify them. The EHT unit only has two leads so I'm thinking a simple half-wave rectifier as in a small screen set. I wondered if it was from a Thorn 900 (later version). I looked at the possibility of a 981 chassis but I think that EHT unit is physically different. He suggested the LOPT could be from a 1600 or later series. Attached are a couple of photos. Any help on identifying these two parts would be a great help. Regards Symon Attached Thumbnails

10th Apr 2013, 2:29 pm	#2
Nicklyons2 Octode Join Date: Jan 2013 Location: Barnsley, South Yorkshire, UK. Posts: 1,517	Re: Help Identifying Thorn LOPT and EHT rectifier LOPT looks a bit like the 1591 portable to me. EHT doesn't ring any bells I'm afraid.

10th Apr 2013, 3:46 pm	#3
dazzlevision Dekatron Join Date: Sep 2003 Location: Near Swindon, North Wiltshire, UK. Posts: 3,621	Re: Help Identifying Thorn LOPT and EHT rectifier Hello, Are there no markings at all on these two units? The LOPT is a Plessey made type and usually has a label on it with the Plessey part number (such as PLY 65/003). It does look like the type fitted in the Thorn 1590/1591 chassis. The rather small EHT rectifier could be for the Thorn 8000 colour TV chassis (the plug on it is the same type as the one on the Thorn 8500 EHT rectifier module) and it may have (depending on the actual maker of the unit) the following part numbers on them: TS20-11HAA, 9OM4-024 or E22A. Regards, Dazzlevision

10th Apr 2013, 8:02 pm	#4
Philips210 Nonode Join Date: May 2007 Location: Redruth, Cornwall, UK. Posts: 2,579	Re: Help Identifying Thorn LOPT and EHT rectifier Hi. There is an ID number on the LOPT, this being PLY 69/000. It certainly looks similar to a 1590/1 type but the one in the pic is obviously missing it's stick rectifier. I suppose new 1590 LOPTs were supplied without this and would thus have to be transferred over from the old LOPT. Thanks so far for your replies. Regards Symon.

10th Apr 2013, 8:08 pm	#5
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,935	Re: Help Identifying Thorn LOPT and EHT rectifier I would have said Thorn 8000 as i used to repair these many moons ago. __________________ G8JET BVWS Archivist and Member V.M.A.R.S