UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Is anyone likely to be interested in these 'oscilloscopes' [Cardiorater]

GrimJosef · 8th Dec 2018, 7:39 pm

I have recently come by two of each of: Cardiorater Type 64 (Cardiac Recorders Ltd) and Monitor C.R.O. Type 1069 B (The Edison Swan Electric Co Ltd). All four units look like they were taken out of active service after long working lives and have since been in storage for many years. They are externally pretty scruffy and one of the Cardioraters has bits missing.

The Cardioraters look like the rightmost of these three http://filmmedical.co.uk/images/stock/img488.jpg. They're rather nicely made inside, as I guess medical equipment has always tended to be. The handful of B9A small-signal valves are missing but there are pencil marks showing what they were. There are also some BCY34 transistors in there with nice long leads. There is a worryingly large number of carbon comp resistors however, almost all of which (I imagine) will have drifted well out of spec by now. The CRT is a Brimar SE5F with a long-persistence P7 phosphor. The datasheet for these starts at PDF page 326 here https://ia801707.us.archive.org/4/it...978Volume2.pdf. The magnetic shield is present too.

The Monitor C.R.O.s are 19" rack units. They're less well made. The six B7G valves are present. There are connectors on the rear and control knobs, along with a voltmeter, on the front. The controls are labelled but none is calibrated. The scope tube is an E4412/E/9 and seems to be identical to the one shown here https://www.vintage-radio.net/forum/...ad.php?t=82190. The magnetic shield is much cruder - just a couple of thin metal half-cylinders held in place by screw clips.

I suspect that no-one will love either of these sufficiently to want to buy them and try to get them working. I wonder whether the parts (most likely the CRTs ?) might be useful to someone though ?

If they're interesting to you, or if you can put anyone who might be interested in them in touch with me, then please do let me know. If there's any real interest then I could clear some space and try and take some pictures of them.

EDIT: By the way, if this is the wrong place for this thread then please do move it Mods.

Cheers,

GJ

8th Dec 2018, 7:39 pm	#1
GrimJosef Dekatron Join Date: Sep 2007 Location: Oxfordshire, UK. Posts: 4,311	Is anyone likely to be interested in these 'oscilloscopes' [Cardiorater] I have recently come by two of each of: Cardiorater Type 64 (Cardiac Recorders Ltd) and Monitor C.R.O. Type 1069 B (The Edison Swan Electric Co Ltd). All four units look like they were taken out of active service after long working lives and have since been in storage for many years. They are externally pretty scruffy and one of the Cardioraters has bits missing. The Cardioraters look like the rightmost of these three http://filmmedical.co.uk/images/stock/img488.jpg. They're rather nicely made inside, as I guess medical equipment has always tended to be. The handful of B9A small-signal valves are missing but there are pencil marks showing what they were. There are also some BCY34 transistors in there with nice long leads. There is a worryingly large number of carbon comp resistors however, almost all of which (I imagine) will have drifted well out of spec by now. The CRT is a Brimar SE5F with a long-persistence P7 phosphor. The datasheet for these starts at PDF page 326 here https://ia801707.us.archive.org/4/it...978Volume2.pdf. The magnetic shield is present too. The Monitor C.R.O.s are 19" rack units. They're less well made. The six B7G valves are present. There are connectors on the rear and control knobs, along with a voltmeter, on the front. The controls are labelled but none is calibrated. The scope tube is an E4412/E/9 and seems to be identical to the one shown here https://www.vintage-radio.net/forum/...ad.php?t=82190. The magnetic shield is much cruder - just a couple of thin metal half-cylinders held in place by screw clips. I suspect that no-one will love either of these sufficiently to want to buy them and try to get them working. I wonder whether the parts (most likely the CRTs ?) might be useful to someone though ? If they're interesting to you, or if you can put anyone who might be interested in them in touch with me, then please do let me know. If there's any real interest then I could clear some space and try and take some pictures of them. EDIT: By the way, if this is the wrong place for this thread then please do move it Mods. Cheers, GJ __________________ http://www.ampregen.com Last edited by GrimJosef; 8th Dec 2018 at 7:44 pm.