Old Oscilloscope - UK Vintage Radio Repair and Restoration Discussion Forum

Oldfred98 · 10th Mar 2017, 5:41 pm

Whilst sorting out my new workshop I found an old 1 inch oscilloscope I purchased about 50 years ago as part of an electronics training course. The case was extra so I did not buy it. You may notice that the kit was supplied with a mains lead with no earth. In a few days I will see if it still works. I will use a light bulb to limit current

HamishBoxer · 10th Mar 2017, 8:23 pm

Yes I remember those courses were you got a scope or signal generator kit. Chances are subject to any waxy caps being used it will work if gently woke up.

Chris55000 · 7th Jun 2017, 10:26 pm

Hi!

If I'm not mistaken, that's the loctal B8G–based 1CP1 c.r.t. that was used in that design – data on it is fairly easy to come by - it has two separate 'X' plate base pins and one separate 'Y' plate connection, the other 'Y' plate is common to A1 + A3 and one base pin, A2 is internally connected to cathode (the CRT has auto-focus), whilst G1, K and the heaters account for the other pins.

The rest of it is very similar to the valve–based "DIY British National Radio Oscilloscope" circuit, elsewhere on this forum!

Chris Williams

10th Mar 2017, 5:41 pm	#1
Oldfred98 Triode Join Date: Jun 2014 Location: Midhurst, Sussex, UK. Posts: 10	Old Oscilloscope Whilst sorting out my new workshop I found an old 1 inch oscilloscope I purchased about 50 years ago as part of an electronics training course. The case was extra so I did not buy it. You may notice that the kit was supplied with a mains lead with no earth. In a few days I will see if it still works. I will use a light bulb to limit current Attached Thumbnails

10th Mar 2017, 8:23 pm	#2
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,932	Re: Old Oscilloscope Yes I remember those courses were you got a scope or signal generator kit. Chances are subject to any waxy caps being used it will work if gently woke up. __________________ G8JET BVWS Archivist and Member V.M.A.R.S

7th Jun 2017, 10:26 pm	#3
Chris55000 Nonode Join Date: Aug 2007 Location: Walsall Wood, Aldridge, Walsall, UK. Posts: 2,868	Re: Old Oscilloscope Hi! If I'm not mistaken, that's the loctal B8G–based 1CP1 c.r.t. that was used in that design – data on it is fairly easy to come by - it has two separate 'X' plate base pins and one separate 'Y' plate connection, the other 'Y' plate is common to A1 + A3 and one base pin, A2 is internally connected to cathode (the CRT has auto-focus), whilst G1, K and the heaters account for the other pins. The rest of it is very similar to the valve–based "DIY British National Radio Oscilloscope" circuit, elsewhere on this forum! Chris Williams __________________ It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed! Last edited by Chris55000; 7th Jun 2017 at 10:44 pm.