Two 14" picture monitors. - UK Vintage Radio Repair and Restoration Discussion Forum

FERNSEH · 29th Sep 2017, 12:38 pm

Arrived yesterday, two rather dirty and bashed up monitors. One is a Marconi and the really rusty one is an unknown make to me.
If unserviceable, there's always two 14" rectangular electrostatic gun CRTs for other restoration projects.

DFWB.

Tractionist · 29th Sep 2017, 12:55 pm

I thought you were 'down-sizing'? Ho! Hee! Hee!

(Far too useful to dump I'll grant you ..... as is anything un-necked and lively ..... )

FERNSEH · 29th Sep 2017, 4:18 pm

Tractionist wrote: "I thought you were 'down-sizing'? Ho! Hee! Hee!"
Well I am but the chance of two 14" electrostatic CRTs was too good to miss.
The monitor with the rusty cabinet is an all transistor model made in the USA by Conrac in California. The CRT is a Mullard AW36-48. The line output transistor is a BU106, European devices in an American product.
This monitor was made for 250volt 50 or 60Hz mains supplies.

DFWB.

MonochromeMarc · 29th Sep 2017, 4:43 pm

So that's where they went, did you get a stick of Blackpool rock with them ?

Marc.

1100 man · 29th Sep 2017, 4:53 pm

What better way of downsizing than buying more stuff!!

I'm sure I saw those on Ebay recently and wondered who might buy them- they looked interesting!
Presumably, the American one is 525 line? What about the other one?
All the best.
Nick

Heatercathodeshort · 29th Sep 2017, 5:47 pm

Be careful when opening your front door David. An alert has gone out for the men in white coats. J.

kan_turk · 29th Sep 2017, 6:00 pm

Conrac monitor is very likely 525/625, or at least will work well on 625 - line frequency is almost identical while field timebase could be persuaded to work at 50Hz- many of these found their way across the atlantic in the 60s & 70s - earlier ones had some valves, later all transistor like this one. It is likely that CRT and BU106 were fitted while in European service - originals were probably American.

FERNSEH · 29th Sep 2017, 6:23 pm

"So that's where they went, did you get a stick of Blackpool rock with them ?
Marc." Hi Marc, No Blackpool rock, but found some soil in one of the monitors. Blackpool rock? High sugar levels, not good.

1100Man wrote: "Presumably, the American one is 525 line? What about the other one?"
All the best.
Nick Hi Nick, not sure about that one, the Marconi. It might be 405 only or like my Peto-Scott multi standard monitor, auto sensing for 405/50 and 625/50, also 525/60.

"Be careful when opening your front door David. An alert has gone out for the men in white coats". Hi John, when those white coat men see what I have bought they'll agree this guy knows good stuff when he sees it.

Hi Kan Turk, The Conrac? I reckon it's good for 625/50 and I'm sure it can be fixed easily.
Attachment shows the interior of the Conrac, scary looking thing.

DFWB.

29th Sep 2017, 12:38 pm	#1
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Two 14" picture monitors. Arrived yesterday, two rather dirty and bashed up monitors. One is a Marconi and the really rusty one is an unknown make to me. If unserviceable, there's always two 14" rectangular electrostatic gun CRTs for other restoration projects. DFWB. Attached Thumbnails

29th Sep 2017, 12:55 pm	#2
Tractionist Heptode Join Date: Apr 2016 Location: Cheltenham, Gloucestershire, UK. Posts: 875	Re: Two 14" picture monitors. I thought you were 'down-sizing'? Ho! Hee! Hee! (Far too useful to dump I'll grant you ..... as is anything un-necked and lively ..... ) __________________ Red to red, black to black. Throw the switch and stand well back!

29th Sep 2017, 4:18 pm	#3
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Two 14" picture monitors. Tractionist wrote: "I thought you were 'down-sizing'? Ho! Hee! Hee!" Well I am but the chance of two 14" electrostatic CRTs was too good to miss. The monitor with the rusty cabinet is an all transistor model made in the USA by Conrac in California. The CRT is a Mullard AW36-48. The line output transistor is a BU106, European devices in an American product. This monitor was made for 250volt 50 or 60Hz mains supplies. DFWB. Attached Thumbnails

29th Sep 2017, 4:43 pm	#4
MonochromeMarc Pentode Join Date: Jan 2015 Location: Wakefield, West Yorkshire, UK. Posts: 151	Re: Two 14" picture monitors. So that's where they went, did you get a stick of Blackpool rock with them ? Marc.

29th Sep 2017, 4:53 pm	#5
1100 man Octode Join Date: Apr 2016 Location: Ventnor, Isle of Wight, & Great Dunmow, Essex, UK. Posts: 1,377	Re: Two 14" picture monitors. What better way of downsizing than buying more stuff!! I'm sure I saw those on Ebay recently and wondered who might buy them- they looked interesting! Presumably, the American one is 525 line? What about the other one? All the best. Nick

29th Sep 2017, 5:47 pm	#6
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Two 14" picture monitors. Be careful when opening your front door David. An alert has gone out for the men in white coats. J.

29th Sep 2017, 6:00 pm	#7
kan_turk Hexode Join Date: Mar 2014 Location: Dublin, Ireland Posts: 398	Re: Two 14" picture monitors. Conrac monitor is very likely 525/625, or at least will work well on 625 - line frequency is almost identical while field timebase could be persuaded to work at 50Hz- many of these found their way across the atlantic in the 60s & 70s - earlier ones had some valves, later all transistor like this one. It is likely that CRT and BU106 were fitted while in European service - originals were probably American.

29th Sep 2017, 6:23 pm	#8
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Two 14" picture monitors. "So that's where they went, did you get a stick of Blackpool rock with them ? Marc." Hi Marc, No Blackpool rock, but found some soil in one of the monitors. Blackpool rock? High sugar levels, not good. 1100Man wrote: "Presumably, the American one is 525 line? What about the other one?" All the best. Nick Hi Nick, not sure about that one, the Marconi. It might be 405 only or like my Peto-Scott multi standard monitor, auto sensing for 405/50 and 625/50, also 525/60. "Be careful when opening your front door David. An alert has gone out for the men in white coats". Hi John, when those white coat men see what I have bought they'll agree this guy knows good stuff when he sees it. Hi Kan Turk, The Conrac? I reckon it's good for 625/50 and I'm sure it can be fixed easily. Attachment shows the interior of the Conrac, scary looking thing. DFWB. Attached Thumbnails Last edited by FERNSEH; 29th Sep 2017 at 6:29 pm.