Graph Oscilloscope type 303C. Value? - UK Vintage Radio Repair and Restoration Discussion Forum

bill newton · 4th Sep 2017, 5:09 pm

I have one of the above with the original operating instruction book. I have not fired it up but I assume it works.

Is it worth anything?

Cobaltblue · 4th Sep 2017, 10:33 pm

Hi Bill

No idea if its worth anything but there was a previous thread about one of these here

https://www.vintage-radio.net/forum/...d.php?t=130092

It looks to be of around 1960 vintage.

Cheers

Mike T

suebutcher · 5th Sep 2017, 9:39 am

They're still a useful instrument and easy to service, so I'd say it is worth something, and the instruction book isn't on the web anywhere as far as I know. I bought mine for $15, but it was faulty and the knobs were missing, and that was over twenty years ago. It wasn't very hard to get it going, in fact the knobs were the biggest headache. Are you thinking of selling? If not, could you post a scan of the circuit diagram? I'm interested to see how it differs from the Radar 303.

WME_bill · 5th Sep 2017, 3:18 pm

Graph 303C / Radar 303C.
I fear you won't make your fortune with this. I see that Suebutcher in Australia is wondering about comparing the Graph version with the Radar (Waveforms) 303C of 1959-1960. I think it is the same. Can you post the Graph 303C circuit, I wonder.
See the earlier thread of October 2016, which gives the date as 1959, and the circuit of the Radar 303C which I posted.

In terms of value, probably the nearest comparable is the Telequipment S31, with same 6 Mhz, 100mV performance, produced from about the same date.

Much more popular is theTelequipment S32, a vastly improved version (10Mhz), of 1963/4, which I suspect really established Telequipment in the market.
The S32 has appeared on ebay between 2008 and 2017 at around £15 to £20, but I am not sure all were actually sold even if working.
If you are thinking of selling, I would be interested, as I have the earlier Radar301, and would like to add it to my collection of early oscilloscopes. Send me a PM.
wme_bill

4th Sep 2017, 5:09 pm	#1
bill newton Retired Dormant Member Join Date: Sep 2017 Location: Stockport, Cheshire, UK. Posts: 1	Graph Oscilloscope type 303C. Value? I have one of the above with the original operating instruction book. I have not fired it up but I assume it works. Is it worth anything?

4th Sep 2017, 10:33 pm	#2
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,874	Re: Graph Oscilloscope type 303C. Value? Hi Bill No idea if its worth anything but there was a previous thread about one of these here https://www.vintage-radio.net/forum/...d.php?t=130092 It looks to be of around 1960 vintage. Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

5th Sep 2017, 9:39 am	#3
suebutcher Heptode Join Date: Jul 2012 Location: Daylesford, Victoria, Australia Posts: 675	Re: Graph Oscilloscope type 303C. Value? They're still a useful instrument and easy to service, so I'd say it is worth something, and the instruction book isn't on the web anywhere as far as I know. I bought mine for $15, but it was faulty and the knobs were missing, and that was over twenty years ago. It wasn't very hard to get it going, in fact the knobs were the biggest headache. Are you thinking of selling? If not, could you post a scan of the circuit diagram? I'm interested to see how it differs from the Radar 303. __________________ The Waves That Rule Britannia Last edited by suebutcher; 5th Sep 2017 at 9:45 am.

5th Sep 2017, 3:18 pm	#4
WME_bill Octode Join Date: Oct 2007 Location: Exeter, Devon, UK. Posts: 1,554	Re: Graph Oscilloscope type 303C. Value? Graph 303C / Radar 303C. I fear you won't make your fortune with this. I see that Suebutcher in Australia is wondering about comparing the Graph version with the Radar (Waveforms) 303C of 1959-1960. I think it is the same. Can you post the Graph 303C circuit, I wonder. See the earlier thread of October 2016, which gives the date as 1959, and the circuit of the Radar 303C which I posted. In terms of value, probably the nearest comparable is the Telequipment S31, with same 6 Mhz, 100mV performance, produced from about the same date. Much more popular is theTelequipment S32, a vastly improved version (10Mhz), of 1963/4, which I suspect really established Telequipment in the market. The S32 has appeared on ebay between 2008 and 2017 at around £15 to £20, but I am not sure all were actually sold even if working. If you are thinking of selling, I would be interested, as I have the earlier Radar301, and would like to add it to my collection of early oscilloscopes. Send me a PM. wme_bill