LOPT identification! - UK Vintage Radio Repair and Restoration Discussion Forum

Lloyd 1985 · 27th Apr 2020, 8:32 pm

Hope I’ve put this in the right section!

I’ve had this LOPT hanging around for ages, originally purchased as one for a Philips Style 70, but it looks nothing like the one in my Stella ST2049A, which is a style 70 chassis!

My guess so far is it’s for a mono set, from the dual standard era by the look of it, possibly 625 only. Valves in it are PY81, PL36, and a DY86/87. There are some multi way sockets, and pull and turn knob for setting something, possibly focus?

Anyway, here’s some photos of it.

Regards
Lloyd

Cobaltblue · 27th Apr 2020, 9:04 pm

That looks remarkably like the cage fitted to my Cossor (Philips) CT1911U

Haven't seen it in a while 8 years or so but it does ring very many bells especially all those capacitors at jaunty angles which is the width control.

Cheers

Mike T

HamishBoxer · 27th Apr 2020, 10:11 pm

Phillips 1768U?

Lloyd 1985 · 28th Apr 2020, 6:00 am

Cheers guys, that’s 2 to look into!

Regards
Lloyd

Cobaltblue · 28th Apr 2020, 6:10 am

Unfortunately the set is in Poole and I am un lockdown in Exeter however you can get a copy of the manual from Jon's excellent web site www.thevalvepage.com
http://www.thevalvepage.com/resource...ls/manuals.php
Hope the link works ok if not I am ste you will find it

Cheers

Mike T

dazzlevision · 28th Apr 2020, 8:15 am

The Philips part number for the whole plug-in assembly is stamped on the front (looks like MK 516 14). If you can confirm what it is, I should be able to tell you the models it fits.

Cobaltblue · 28th Apr 2020, 8:38 am

Good spot Daz

Confirms one of the sets it fits is a Cossor CT1911U which is a single standard 405 set from 1962 ish

Cheers

Mike T

dazzlevision · 28th Apr 2020, 10:39 am

Quote:

Originally Posted by Cobaltblue

Good spot Daz

Confirms one of the sets it fits is a Cossor CT1911U which is a single standard 405 set from 1962 ish

Cheers

Mike T

Thanks!

The equivalent Philips series (referred to a their "Summit" range), was based on the 19TG111A and 23" versions. Supposedly able to be converted to dual standard operation (but it would have been a major undertaking, I would have thought).

See also this thread:https://www.vintage-radio.net/forum/...d.php?t=136307

Lloyd 1985 · 28th Apr 2020, 3:05 pm

That must be it! The number stamped on it is indeed MK 516 14, and also just under it looks like 3391. There was a piece of paper stuffed in it too, with a drawing of all the connections, and on the back is a Philips model number 19TG171A/1, I’d not noticed it before!

I might list this in the offered section later, as I haven’t a set to put it in, although, saying that you can guarantee that I’ll end up with such a set at some point, and it’ll need a LOPT!

Cheers,
Lloyd

dazzlevision · 28th Apr 2020, 3:34 pm

19TG171A is a Philips “Style 70” chassis dual standard set and it doesn’t use this LOPT. Style 70 LOPTs were notoriously unreliable!

Lloyd 1985 · 28th Apr 2020, 4:03 pm

That’s probably where the confusion came in then, I know how unreliable those style 70 LOPT’s were, the Stella one I’ve got ate 2! Luckily I was able to make one good LOPT out of the 2 it killed, the primary shorted on one and the over wind on the other, good that you could disassemble old LOPT’s like this, unlike the modern potted ones.

I will Amend that bit of paper now to avoid future confusion!

Regards
Lloyd

27th Apr 2020, 8:32 pm	#1
Lloyd 1985 Nonode Join Date: Jun 2008 Location: Coningsby, Lincolnshire, UK. Posts: 2,820	LOPT identification! Hope I’ve put this in the right section! I’ve had this LOPT hanging around for ages, originally purchased as one for a Philips Style 70, but it looks nothing like the one in my Stella ST2049A, which is a style 70 chassis! My guess so far is it’s for a mono set, from the dual standard era by the look of it, possibly 625 only. Valves in it are PY81, PL36, and a DY86/87. There are some multi way sockets, and pull and turn knob for setting something, possibly focus? Anyway, here’s some photos of it. Regards Lloyd Attached Thumbnails

27th Apr 2020, 9:04 pm	#2
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,878	Re: LOPT identification! That looks remarkably like the cage fitted to my Cossor (Philips) CT1911U Haven't seen it in a while 8 years or so but it does ring very many bells especially all those capacitors at jaunty angles which is the width control. Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

27th Apr 2020, 10:11 pm	#3
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,935	Re: LOPT identification! Phillips 1768U? __________________ G8JET BVWS Archivist and Member V.M.A.R.S

28th Apr 2020, 6:00 am	#4
Lloyd 1985 Nonode Join Date: Jun 2008 Location: Coningsby, Lincolnshire, UK. Posts: 2,820	Re: LOPT identification! Cheers guys, that’s 2 to look into! Regards Lloyd

28th Apr 2020, 6:10 am	#5
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,878	Re: LOPT identification! Unfortunately the set is in Poole and I am un lockdown in Exeter however you can get a copy of the manual from Jon's excellent web site www.thevalvepage.com http://www.thevalvepage.com/resource...ls/manuals.php Hope the link works ok if not I am ste you will find it Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

28th Apr 2020, 8:15 am	#6
dazzlevision Dekatron Join Date: Sep 2003 Location: Near Swindon, North Wiltshire, UK. Posts: 3,621	Re: LOPT identification! The Philips part number for the whole plug-in assembly is stamped on the front (looks like MK 516 14). If you can confirm what it is, I should be able to tell you the models it fits.

28th Apr 2020, 8:38 am	#7
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,878	Re: LOPT identification! Good spot Daz Confirms one of the sets it fits is a Cossor CT1911U which is a single standard 405 set from 1962 ish Cheers Mike T Attached Thumbnails __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

28th Apr 2020, 3:05 pm	#9
Lloyd 1985 Nonode Join Date: Jun 2008 Location: Coningsby, Lincolnshire, UK. Posts: 2,820	Re: LOPT identification! That must be it! The number stamped on it is indeed MK 516 14, and also just under it looks like 3391. There was a piece of paper stuffed in it too, with a drawing of all the connections, and on the back is a Philips model number 19TG171A/1, I’d not noticed it before! I might list this in the offered section later, as I haven’t a set to put it in, although, saying that you can guarantee that I’ll end up with such a set at some point, and it’ll need a LOPT! Cheers, Lloyd Attached Thumbnails

28th Apr 2020, 3:34 pm	#10
dazzlevision Dekatron Join Date: Sep 2003 Location: Near Swindon, North Wiltshire, UK. Posts: 3,621	Re: LOPT identification! 19TG171A is a Philips “Style 70” chassis dual standard set and it doesn’t use this LOPT. Style 70 LOPTs were notoriously unreliable!

28th Apr 2020, 4:03 pm	#11
Lloyd 1985 Nonode Join Date: Jun 2008 Location: Coningsby, Lincolnshire, UK. Posts: 2,820	Re: LOPT identification! That’s probably where the confusion came in then, I know how unreliable those style 70 LOPT’s were, the Stella one I’ve got ate 2! Luckily I was able to make one good LOPT out of the 2 it killed, the primary shorted on one and the over wind on the other, good that you could disassemble old LOPT’s like this, unlike the modern potted ones. I will Amend that bit of paper now to avoid future confusion! Regards Lloyd